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These examples are taken from C99 6.10.3.5. // dprintf is used instead of fprintf to avoid needing to declare // FILE and stderr. #define debug(...) dprintf (2, __VA_ARGS__) #define showlist(...) puts (#__VA_ARGS__) #define report(test,...) 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++i) continue; return 0; } // Check varargs and va_copy. static bool test_varargs (const char *format, ...) { va_list args; va_start (args, format); va_list args_copy; va_copy (args_copy, args); const char *str = ""; int number = 0; float fnumber = 0; while (*format) { switch (*format++) { case '\''s'\'': // string str = va_arg (args_copy, const char *); break; case '\''d'\'': // int number = va_arg (args_copy, int); break; case '\''f'\'': // float fnumber = va_arg (args_copy, double); break; default: break; } } va_end (args_copy); va_end (args); return *str && number && fnumber; } ' # Test code for whether the C compiler supports C99 (body of main). ac_c_conftest_c99_main=' // Check bool. _Bool success = false; success |= (argc != 0); // Check restrict. if (test_restrict ("String literal") == 0) success = true; char *restrict newvar = "Another string"; // Check varargs. success &= test_varargs ("s, d'\'' f .", "string", 65, 34.234); test_varargs_macros (); // Check flexible array members. struct incomplete_array *ia = malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10)); ia->datasize = 10; for (int i = 0; i < ia->datasize; ++i) ia->data[i] = i * 1.234; // Check named initializers. struct named_init ni = { .number = 34, .name = L"Test wide string", .average = 543.34343, }; ni.number = 58; int dynamic_array[ni.number]; dynamic_array[0] = argv[0][0]; dynamic_array[ni.number - 1] = 543; // work around unused variable warnings ok |= (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == '\''x'\'' || dynamic_array[ni.number - 1] != 543); ' # Test code for whether the C compiler supports C11 (global declarations) ac_c_conftest_c11_globals=' // Does the compiler advertise C11 conformance? #if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112L # error "Compiler does not advertise C11 conformance" #endif // Check _Alignas. char _Alignas (double) aligned_as_double; char _Alignas (0) no_special_alignment; extern char aligned_as_int; char _Alignas (0) _Alignas (int) aligned_as_int; // Check _Alignof. enum { int_alignment = _Alignof (int), int_array_alignment = _Alignof (int[100]), char_alignment = _Alignof (char) }; _Static_assert (0 < -_Alignof (int), "_Alignof is signed"); // Check _Noreturn. int _Noreturn does_not_return (void) { for (;;) continue; } // Check _Static_assert. struct test_static_assert { int x; _Static_assert (sizeof (int) <= sizeof (long int), "_Static_assert does not work in struct"); long int y; }; // Check UTF-8 literals. #define u8 syntax error! char const utf8_literal[] = u8"happens to be ASCII" "another string"; // Check duplicate typedefs. typedef long *long_ptr; typedef long int *long_ptr; typedef long_ptr long_ptr; // Anonymous structures and unions -- taken from C11 6.7.2.1 Example 1. struct anonymous { union { struct { int i; int j; }; struct { int k; long int l; } w; }; int m; } v1; ' # Test code for whether the C compiler supports C11 (body of main). ac_c_conftest_c11_main=' _Static_assert ((offsetof (struct anonymous, i) == offsetof (struct anonymous, w.k)), "Anonymous union alignment botch"); v1.i = 2; v1.w.k = 5; ok |= v1.i != 5; ' # Test code for whether the C compiler supports C11 (complete). ac_c_conftest_c11_program="${ac_c_conftest_c89_globals} ${ac_c_conftest_c99_globals} ${ac_c_conftest_c11_globals} int main (int argc, char **argv) { int ok = 0; ${ac_c_conftest_c89_main} ${ac_c_conftest_c99_main} ${ac_c_conftest_c11_main} return ok; } " # Test code for whether the C compiler supports C99 (complete). ac_c_conftest_c99_program="${ac_c_conftest_c89_globals} ${ac_c_conftest_c99_globals} int main (int argc, char **argv) { int ok = 0; ${ac_c_conftest_c89_main} ${ac_c_conftest_c99_main} return ok; } " # Test code for whether the C compiler supports C89 (complete). ac_c_conftest_c89_program="${ac_c_conftest_c89_globals} int main (int argc, char **argv) { int ok = 0; ${ac_c_conftest_c89_main} return ok; } " # Test code for whether the C++ compiler supports C++98 (global declarations) ac_cxx_conftest_cxx98_globals=' // Does the compiler advertise C++98 conformance? #if !defined __cplusplus || __cplusplus < 199711L # error "Compiler does not advertise C++98 conformance" #endif // These inclusions are to reject old compilers that // lack the unsuffixed header files. #include #include // and are *not* freestanding headers in C++98. extern void assert (int); namespace std { extern int strcmp (const char *, const char *); } // Namespaces, exceptions, and templates were all added after "C++ 2.0". using std::exception; using std::strcmp; namespace { void test_exception_syntax() { try { throw "test"; } catch (const char *s) { // Extra parentheses suppress a warning when building autoconf itself, // due to lint rules shared with more typical C programs. assert (!(strcmp) (s, "test")); } } template struct test_template { T const val; explicit test_template(T t) : val(t) {} template T add(U u) { return static_cast(u) + val; } }; } // anonymous namespace ' # Test code for whether the C++ compiler supports C++98 (body of main) ac_cxx_conftest_cxx98_main=' assert (argc); assert (! argv[0]); { test_exception_syntax (); test_template tt (2.0); assert (tt.add (4) == 6.0); assert (true && !false); } ' # Test code for whether the C++ compiler supports C++11 (global declarations) ac_cxx_conftest_cxx11_globals=' // Does the compiler advertise C++ 2011 conformance? #if !defined __cplusplus || __cplusplus < 201103L # error "Compiler does not advertise C++11 conformance" #endif namespace cxx11test { constexpr int get_val() { return 20; } struct testinit { int i; double d; }; class delegate { public: delegate(int n) : n(n) {} delegate(): delegate(2354) {} virtual int getval() { return this->n; }; protected: int n; }; class overridden : public delegate { public: overridden(int n): delegate(n) {} virtual int getval() override final { return this->n * 2; } }; class nocopy { public: nocopy(int i): i(i) {} nocopy() = default; nocopy(const nocopy&) = delete; nocopy & operator=(const nocopy&) = delete; private: int i; }; // for testing lambda expressions template Ret eval(Fn f, Ret v) { return f(v); } // for testing variadic templates and trailing return types template auto sum(V first) -> V { return first; } template auto sum(V first, Args... rest) -> V { return first + sum(rest...); } } ' # Test code for whether the C++ compiler supports C++11 (body of main) ac_cxx_conftest_cxx11_main=' { // Test auto and decltype auto a1 = 6538; auto a2 = 48573953.4; auto a3 = "String literal"; int total = 0; for (auto i = a3; *i; ++i) { total += *i; } decltype(a2) a4 = 34895.034; } { // Test constexpr short sa[cxx11test::get_val()] = { 0 }; } { // Test initializer lists cxx11test::testinit il = { 4323, 435234.23544 }; } { // Test range-based for int array[] = {9, 7, 13, 15, 4, 18, 12, 10, 5, 3, 14, 19, 17, 8, 6, 20, 16, 2, 11, 1}; for (auto &x : array) { x += 23; } } { // Test lambda expressions using cxx11test::eval; assert (eval ([](int x) { return x*2; }, 21) == 42); double d = 2.0; assert (eval ([&](double x) { return d += x; }, 3.0) == 5.0); assert (d == 5.0); assert (eval ([=](double x) mutable { return d += x; }, 4.0) == 9.0); assert (d == 5.0); } { // Test use of variadic templates using cxx11test::sum; auto a = sum(1); auto b = sum(1, 2); auto c = sum(1.0, 2.0, 3.0); } { // Test constructor delegation cxx11test::delegate d1; cxx11test::delegate d2(); cxx11test::delegate d3(45); } { // Test override and final cxx11test::overridden o1(55464); } { // Test nullptr char *c = nullptr; } { // Test template brackets test_template<::test_template> v(test_template(12)); } { // Unicode literals char const *utf8 = u8"UTF-8 string \u2500"; char16_t const *utf16 = u"UTF-8 string \u2500"; char32_t const *utf32 = U"UTF-32 string \u2500"; } ' # Test code for whether the C compiler supports C++11 (complete). ac_cxx_conftest_cxx11_program="${ac_cxx_conftest_cxx98_globals} ${ac_cxx_conftest_cxx11_globals} int main (int argc, char **argv) { int ok = 0; ${ac_cxx_conftest_cxx98_main} ${ac_cxx_conftest_cxx11_main} return ok; } " # Test code for whether the C compiler supports C++98 (complete). ac_cxx_conftest_cxx98_program="${ac_cxx_conftest_cxx98_globals} int main (int argc, char **argv) { int ok = 0; ${ac_cxx_conftest_cxx98_main} return ok; } " # Auxiliary files required by this configure script. ac_aux_files="install-sh config.guess config.sub" # Locations in which to look for auxiliary files. ac_aux_dir_candidates="${srcdir}/scripts" # Search for a directory containing all of the required auxiliary files, # $ac_aux_files, from the $PATH-style list $ac_aux_dir_candidates. # If we don't find one directory that contains all the files we need, # we report the set of missing files from the *first* directory in # $ac_aux_dir_candidates and give up. ac_missing_aux_files="" ac_first_candidate=: printf "%s\n" "$as_me:${as_lineno-$LINENO}: looking for aux files: $ac_aux_files" >&5 as_save_IFS=$IFS; 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" >&6; } if test ${ac_cv_prog_CC+y} then : printf %s "(cached) " >&6 else $as_nop if test -n "$CC"; then ac_cv_prog_CC="$CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_prog_CC="${ac_tool_prefix}clang" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS fi fi CC=$ac_cv_prog_CC if test -n "$CC"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5 printf "%s\n" "$CC" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi fi if test -z "$ac_cv_prog_CC"; then ac_ct_CC=$CC # Extract the first word of "clang", so it can be a program name with args. set dummy clang; ac_word=$2 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 printf %s "checking for $ac_word... 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"no acceptable C compiler found in \$PATH See \`config.log' for more details" "$LINENO" 5; } # Provide some information about the compiler. printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5 set X $ac_compile ac_compiler=$2 for ac_option in --version -v -V -qversion -version; do { { ac_try="$ac_compiler $ac_option >&5" case "(($ac_try" in *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;; *) ac_try_echo=$ac_try;; esac eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\"" printf "%s\n" "$ac_try_echo"; } >&5 (eval "$ac_compiler $ac_option >&5") 2>conftest.err ac_status=$? if test -s conftest.err; then sed '10a\ ... rest of stderr output deleted ... 10q' conftest.err >conftest.er1 cat conftest.er1 >&5 fi rm -f conftest.er1 conftest.err printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; } done EXEEXT= { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5 printf %s "checking for suffix of object files... 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"cannot compute suffix of object files: cannot compile See \`config.log' for more details" "$LINENO" 5; } fi rm -f conftest.$ac_cv_objext conftest.$ac_ext fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_objext" >&5 printf "%s\n" "$ac_cv_objext" >&6; } OBJEXT=$ac_cv_objext ac_objext=$OBJEXT { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports GNU C" >&5 printf %s "checking whether the compiler supports GNU C... 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" >&6; } if test ${ac_cv_prog_AUTOCONF+y} then : printf %s "(cached) " >&6 else $as_nop if test -n "$AUTOCONF"; then ac_cv_prog_AUTOCONF="$AUTOCONF" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_prog_AUTOCONF="$ac_prog" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS fi fi AUTOCONF=$ac_cv_prog_AUTOCONF if test -n "$AUTOCONF"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $AUTOCONF" >&5 printf "%s\n" "$AUTOCONF" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi test -n "$AUTOCONF" && break done test -n "$AUTOCONF" || AUTOCONF="no" case "x$AUTOCONF" in xno|x|x:) AUTOCONF=no ;; *) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works" >&5 printf %s "checking whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works... " >&6; } if test ${libc_cv_autoconf_works+y} then : printf %s "(cached) " >&6 else $as_nop if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then libc_cv_autoconf_works=yes else libc_cv_autoconf_works=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_autoconf_works" >&5 printf "%s\n" "$libc_cv_autoconf_works" >&6; } test $libc_cv_autoconf_works = yes || AUTOCONF=no ;; esac if test "x$AUTOCONF" = xno; then aux_missing="$aux_missing autoconf" fi else AUTOCONF=no fi # Check for python3 if available, or else python. for ac_prog in python3 python do # Extract the first word of "$ac_prog", so it can be a program name with args. set dummy $ac_prog; ac_word=$2 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 printf %s "checking for $ac_word... " >&6; } if test ${ac_cv_prog_PYTHON_PROG+y} then : printf %s "(cached) " >&6 else $as_nop if test -n "$PYTHON_PROG"; then ac_cv_prog_PYTHON_PROG="$PYTHON_PROG" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_prog_PYTHON_PROG="$ac_prog" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS fi fi PYTHON_PROG=$ac_cv_prog_PYTHON_PROG if test -n "$PYTHON_PROG"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $PYTHON_PROG" >&5 printf "%s\n" "$PYTHON_PROG" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi test -n "$PYTHON_PROG" && break done if test -z "$PYTHON_PROG"; then ac_verc_fail=yes else # Found it, now check the version. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking version of $PYTHON_PROG" >&5 printf %s "checking version of $PYTHON_PROG... " >&6; } ac_prog_version=`$PYTHON_PROG --version 2>&1 | sed -n 's/^.*Python \([0-9][0-9.]*\).*$/\1/p'` case $ac_prog_version in '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;; 3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*) ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;; *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;; esac { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_prog_version" >&5 printf "%s\n" "$ac_prog_version" >&6; } fi if test $ac_verc_fail = yes; then critic_missing="$critic_missing python" fi PYTHON="$PYTHON_PROG -B" test -n "$critic_missing" && as_fn_error $? " *** These critical programs are missing or too old:$critic_missing *** Check the INSTALL file for required versions." "$LINENO" 5 test -n "$aux_missing" && { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: *** These auxiliary programs are missing or incompatible versions:$aux_missing *** some features or tests will be disabled. *** Check the INSTALL file for required versions." >&5 printf "%s\n" "$as_me: WARNING: *** These auxiliary programs are missing or incompatible versions:$aux_missing *** some features or tests will be disabled. *** Check the INSTALL file for required versions." >&2;} # Determine whether to use fpu or nofpu sysdeps directories. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for use of fpu sysdeps directories" >&5 printf %s "checking for use of fpu sysdeps directories... " >&6; } if test ${libc_cv_with_fp+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 2>&5 ; then libc_cv_with_fp=yes fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_with_fp" >&5 printf "%s\n" "$libc_cv_with_fp" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector" >&5 printf %s "checking for -fstack-protector... " >&6; } if test ${libc_cv_ssp+y} then : printf %s "(cached) " >&6 else $as_nop if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -fstack-protector -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_ssp=yes else $as_nop libc_cv_ssp=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ssp" >&5 printf "%s\n" "$libc_cv_ssp" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector-strong" >&5 printf %s "checking for -fstack-protector-strong... " >&6; } if test ${libc_cv_ssp_strong+y} then : printf %s "(cached) " >&6 else $as_nop if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -fstack-protector-strong -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_ssp_strong=yes else $as_nop libc_cv_ssp_strong=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ssp_strong" >&5 printf "%s\n" "$libc_cv_ssp_strong" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector-all" >&5 printf %s "checking for -fstack-protector-all... " >&6; } if test ${libc_cv_ssp_all+y} then : printf %s "(cached) " >&6 else $as_nop if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -fstack-protector-all -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_ssp_all=yes else $as_nop libc_cv_ssp_all=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ssp_all" >&5 printf "%s\n" "$libc_cv_ssp_all" >&6; } stack_protector= no_stack_protector= if test "$libc_cv_ssp" = yes; then no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0" printf "%s\n" "#define HAVE_CC_NO_STACK_PROTECTOR 1" >>confdefs.h fi if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then stack_protector="-fstack-protector" printf "%s\n" "#define STACK_PROTECTOR_LEVEL 1" >>confdefs.h elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then stack_protector="-fstack-protector-all" printf "%s\n" "#define STACK_PROTECTOR_LEVEL 2" >>confdefs.h elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then stack_protector="-fstack-protector-strong" printf "%s\n" "#define STACK_PROTECTOR_LEVEL 3" >>confdefs.h else stack_protector="-fno-stack-protector" printf "%s\n" "#define STACK_PROTECTOR_LEVEL 0" >>confdefs.h fi if test -n "$stack_protector"; then no_ssp=-fno-stack-protector else no_ssp= if test "$enable_stack_protector" != no; then as_fn_error $? "--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler." "$LINENO" 5 fi fi # For the multi-arch option we need support in the assembler & linker. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for assembler and linker STT_GNU_IFUNC support" >&5 printf %s "checking for assembler and linker STT_GNU_IFUNC support... " >&6; } if test ${libc_cv_ld_gnu_indirect_function+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.S <&5 2>&5; then # Do a link to see if the backend supports IFUNC relocs. $READELF -r conftest 1>&5 LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && { libc_cv_ld_gnu_indirect_function=yes } fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_gnu_indirect_function" >&5 printf "%s\n" "$libc_cv_ld_gnu_indirect_function" >&6; } # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for gcc attribute ifunc support" >&5 printf %s "checking for gcc attribute ifunc support... " >&6; } if test ${libc_cv_gcc_indirect_function+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 \ 2>&5 ; then if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&5; then libc_cv_gcc_indirect_function=yes fi fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_indirect_function" >&5 printf "%s\n" "$libc_cv_gcc_indirect_function" >&6; } # Check if linker supports textrel relocation with ifunc (used on elf/tests). # Note that it relies on libc_cv_ld_gnu_indirect_function test above. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the linker supports textrels along with ifunc" >&5 printf %s "checking whether the linker supports textrels along with ifunc... " >&6; } if test ${libc_cv_textrel_ifunc+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.S <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then libc_cv_textrel_ifunc=yes fi fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_textrel_ifunc" >&5 printf "%s\n" "$libc_cv_textrel_ifunc" >&6; } # Check if CC supports attribute retain as it is used in attribute_used_retain macro. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for GNU attribute retain support" >&5 printf %s "checking for GNU attribute retain support... " >&6; } if test ${libc_cv_gnu_retain+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 \ 2>&5 ; then libc_cv_gnu_retain=yes fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gnu_retain" >&5 printf "%s\n" "$libc_cv_gnu_retain" >&6; } if test $libc_cv_gnu_retain = yes; then printf "%s\n" "#define HAVE_GNU_RETAIN 1" >>confdefs.h fi config_vars="$config_vars have-gnu-retain = $libc_cv_gnu_retain" # Check if gcc warns about alias for function with incompatible types. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler warns about alias for function with incompatible types" >&5 printf %s "checking if compiler warns about alias for function with incompatible types... " >&6; } if test ${libc_cv_gcc_incompatible_alias+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 2>&5 ; then libc_cv_gcc_incompatible_alias=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_incompatible_alias" >&5 printf "%s\n" "$libc_cv_gcc_incompatible_alias" >&6; } if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then if test x"$multi_arch" = xyes; then as_fn_error $? "--enable-multi-arch support requires assembler and linker support" "$LINENO" 5 else multi_arch=no fi fi if test x"$libc_cv_gcc_indirect_function" != xyes; then # GCC 8+ emits a warning for alias with incompatible types and it might # fail to build ifunc resolvers aliases to either weak or internal # symbols. Disables multiarch build in this case. if test x"$libc_cv_gcc_incompatible_alias" = xyes; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: gcc emits a warning for alias between functions of incompatible types" >&5 printf "%s\n" "$as_me: WARNING: gcc emits a warning for alias between functions of incompatible types" >&2;} if test x"$multi_arch" = xyes; then as_fn_error $? "--enable-multi-arch support requires a gcc with gnu-indirect-function support" "$LINENO" 5 fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: Multi-arch is disabled." >&5 printf "%s\n" "$as_me: WARNING: Multi-arch is disabled." >&2;} multi_arch=no elif test x"$multi_arch" = xyes; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: --enable-multi-arch support recommends a gcc with gnu-indirect-function support. Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function" >&5 printf "%s\n" "$as_me: WARNING: --enable-multi-arch support recommends a gcc with gnu-indirect-function support. Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function" >&2;} fi fi multi_arch_d= if test x"$multi_arch" != xno; then multi_arch_d=/multiarch fi # Compute the list of sysdep directories for this configuration. # This can take a while to compute. sysdep_dir=$srcdir/sysdeps { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking sysdep dirs" >&5 printf %s "checking sysdep dirs... " >&6; } # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1. os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`" test "x$base_os" != x || case "$os" in gnu*) base_os=mach/hurd ;; linux*) base_os=unix/sysv ;; esac # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos. tail=$os ostry=$os while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do ostry="$ostry /$o" tail=$o done o=`echo $tail | sed 's/[0-9]*$//'` if test $o != $tail; then ostry="$ostry /$o" fi # For linux-gnu, try linux-gnu, then linux. o=`echo $tail | sed 's/-.*$//'` if test $o != $tail; then ostry="$ostry /$o" fi # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix. base= tail=$base_os while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do set $b base="$base /$1" tail="$2" done # For sparc/sparc32, try sparc/sparc32 and then sparc. mach= tail=$machine${submachine:+/$submachine} while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do set $m # Prepend the machine's FPU directory unless the architecture specific # preconfigure disables it. if test "$libc_cv_with_fp" = yes; then maybe_fpu=/fpu else maybe_fpu=/nofpu fi # For each machine term, try it with and then without /multiarch. for try_fpu in $maybe_fpu ''; do for try_multi in $multi_arch_d ''; do mach="$mach /$1$try_fpu$try_multi" done done tail="$2" done # Find what sysdep directories exist. sysnames= for b in $base ''; do for m0 in $mach ''; do for v in /$vendor ''; do test "$v" = / && continue for o in /$ostry ''; do test "$o" = / && continue for m in $mach ''; do try_suffix="$m0$b$v$o$m" if test -n "$try_suffix"; then try_srcdir="${srcdir}/" try="sysdeps$try_suffix" test -n "$enable_debug_configure" && echo "$0 DEBUG: try $try" >&2 if test -d "$try_srcdir$try"; then sysnames="$sysnames $try" { test -n "$o" || test -n "$b"; } && os_used=t { test -n "$m" || test -n "$m0"; } && machine_used=t case x${m0:-$m} in x*/$submachine) submachine_used=t ;; esac fi fi done done done done done # If the assembler supports gnu_indirect_function symbol type and the # architecture supports multi-arch, we enable multi-arch by default. case $sysnames in *"$multi_arch_d"*) ;; *) test x"$multi_arch" = xdefault && multi_arch=no ;; esac if test x"$multi_arch" != xno; then printf "%s\n" "#define USE_MULTIARCH 1" >>confdefs.h fi if test -z "$os_used" && test "$os" != none; then as_fn_error $? "Operating system $os is not supported." "$LINENO" 5 fi if test -z "$machine_used" && test "$machine" != none; then as_fn_error $? "The $machine is not supported." "$LINENO" 5 fi if test -z "$submachine_used" && test -n "$submachine"; then as_fn_error $? "The $submachine subspecies of $host_cpu is not supported." "$LINENO" 5 fi # We have now validated the configuration. # Expand the list of system names into a full list of directories # from each element's parent name and Implies file (if present). set $sysnames names= while test $# -gt 0; do name=$1 shift case " $names " in *" $name "*) # Already in the list. continue esac # Report each name as we discover it, so there is no long pause in output. echo $ECHO_N "$name $ECHO_C" >&6 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'` case $name in /*) xsrcdir= ;; *) xsrcdir=$srcdir/ ;; esac test -n "$enable_debug_configure" && echo "DEBUG: name/Implies $xsrcdir$name/Implies" >&2 for implies_file in Implies Implies-before Implies-after; do implies_type=`echo $implies_file | sed s/-/_/` eval ${implies_type}= if test -f $xsrcdir$name/$implies_file; then # Collect more names from the `Implies' file (removing comments). implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`" for x in $implied_candidate; do found=no if test -d $xsrcdir$name_base/$x; then eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\"" found=yes fi try="sysdeps/$x" try_srcdir=$srcdir/ test -n "$enable_debug_configure" && echo "DEBUG: $name $implies_file $x try() {$try_srcdir}$try" >&2 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try; then eval "${implies_type}=\"\$${implies_type} \$try\"" found=yes fi if test $found = no; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: $name/$implies_file specifies nonexistent $x" >&5 printf "%s\n" "$as_me: WARNING: $name/$implies_file specifies nonexistent $x" >&2;} fi done fi done # Add NAME to the list of names. names="$names $name" # Find the parent of NAME, using the empty string if it has none. parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`" test -n "$enable_debug_configure" && echo "DEBUG: $name Implies='$Implies' rest='$*' parent='$parent' \ Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2 # Add the names implied by NAME, and NAME's parent (if it has one), to # the list of names to be processed (the argument list). We prepend the # implied names to the list and append the parent. We want implied # directories to come before further directories inferred from the # configuration components; this ensures that for sysv4, unix/common # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*) # after sysv4). sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`" test -n "$sysnames" && set $sysnames done # Add the default directories. default_sysnames="sysdeps/generic" sysnames="$names $default_sysnames" # The other names were emitted during the scan. { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $default_sysnames" >&5 printf "%s\n" "$default_sysnames" >&6; } # if using special system headers, find out the compiler's sekrit # header directory and add that to the list. NOTE: Only does the right # thing on a system that doesn't need fixincludes. (Not presently a problem.) if test -n "$sysheaders"; then SYSINCLUDES=-nostdinc for d in include include-fixed; do i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" && SYSINCLUDES="$SYSINCLUDES -isystem $i" done SYSINCLUDES="$SYSINCLUDES \ -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`" if test -n "$CXX"; then CXX_SYSINCLUDES= for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \ | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do test "x$cxxheaders" != x && CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders" done fi fi # Obtain some C++ header file paths. This is used to make a local # copy of those headers in Makerules. if test -n "$CXX"; then find_cxx_header () { echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \ | $AWK '$1 == "."{print $2}' } CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" CXX_CMATH_HEADER="$(find_cxx_header cmath)" CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)" fi # Test if LD_LIBRARY_PATH contains the notation for the current directory # since this would lead to problems installing/building glibc. # LD_LIBRARY_PATH contains the current directory if one of the following # is true: # - one of the terminals (":" and ";") is the first or last sign # - two terminals occur directly after each other # - the path contains an element with a dot in it { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking LD_LIBRARY_PATH variable" >&5 printf %s "checking LD_LIBRARY_PATH variable... " >&6; } case ${LD_LIBRARY_PATH} in [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* ) ld_library_path_setting="contains current directory" ;; *) ld_library_path_setting="ok" ;; esac { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ld_library_path_setting" >&5 printf "%s\n" "$ld_library_path_setting" >&6; } if test "$ld_library_path_setting" != "ok"; then as_fn_error $? " *** LD_LIBRARY_PATH shouldn't contain the current directory when *** building glibc. Please change the environment variable *** and run configure again." "$LINENO" 5 fi # Extract the first word of "bash", so it can be a program name with args. set dummy bash; ac_word=$2 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 printf %s "checking for $ac_word... " >&6; } if test ${ac_cv_path_BASH_SHELL+y} then : printf %s "(cached) " >&6 else $as_nop case $BASH_SHELL in [\\/]* | ?:[\\/]*) ac_cv_path_BASH_SHELL="$BASH_SHELL" # Let the user override the test with a path. ;; *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_path_BASH_SHELL="$as_dir$ac_word$ac_exec_ext" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS test -z "$ac_cv_path_BASH_SHELL" && ac_cv_path_BASH_SHELL="no" ;; esac fi BASH_SHELL=$ac_cv_path_BASH_SHELL if test -n "$BASH_SHELL"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $BASH_SHELL" >&5 printf "%s\n" "$BASH_SHELL" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi # Extract the first word of "perl", so it can be a program name with args. set dummy perl; ac_word=$2 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 printf %s "checking for $ac_word... " >&6; } if test ${ac_cv_path_PERL+y} then : printf %s "(cached) " >&6 else $as_nop case $PERL in [\\/]* | ?:[\\/]*) ac_cv_path_PERL="$PERL" # Let the user override the test with a path. ;; *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_path_PERL="$as_dir$ac_word$ac_exec_ext" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS test -z "$ac_cv_path_PERL" && ac_cv_path_PERL="no" ;; esac fi PERL=$ac_cv_path_PERL if test -n "$PERL"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $PERL" >&5 printf "%s\n" "$PERL" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi if test "$PERL" != no && (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then PERL=no fi # Extract the first word of "install-info", so it can be a program name with args. set dummy install-info; ac_word=$2 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 printf %s "checking for $ac_word... " >&6; } if test ${ac_cv_path_INSTALL_INFO+y} then : printf %s "(cached) " >&6 else $as_nop case $INSTALL_INFO in [\\/]* | ?:[\\/]*) ac_cv_path_INSTALL_INFO="$INSTALL_INFO" # Let the user override the test with a path. ;; *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR as_dummy="$PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin" for as_dir in $as_dummy do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_path_INSTALL_INFO="$as_dir$ac_word$ac_exec_ext" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done done IFS=$as_save_IFS test -z "$ac_cv_path_INSTALL_INFO" && ac_cv_path_INSTALL_INFO="no" ;; esac fi INSTALL_INFO=$ac_cv_path_INSTALL_INFO if test -n "$INSTALL_INFO"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $INSTALL_INFO" >&5 printf "%s\n" "$INSTALL_INFO" >&6; } else { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5 printf "%s\n" "no" >&6; } fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for .set assembler directive" >&5 printf %s "checking for .set assembler directive... " >&6; } if test ${libc_cv_asm_set_directive+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.s < conftest1.c <<\EOF extern int glibc_conftest_frobozz; void _start() { glibc_conftest_frobozz = 1; } EOF if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ -nostartfiles -nostdlib $no_ssp \ -o conftest conftest.s conftest1.c 1>&5 2>&5; then libc_cv_asm_set_directive=yes else libc_cv_asm_set_directive=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_set_directive" >&5 printf "%s\n" "$libc_cv_asm_set_directive" >&6; } if test $libc_cv_asm_set_directive = yes; then printf "%s\n" "#define HAVE_ASM_SET_DIRECTIVE 1" >>confdefs.h fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking linker support for protected data symbol" >&5 printf %s "checking linker support for protected data symbol... " >&6; } if test ${libc_cv_protected_data+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then libc_cv_protected_data=yes fi fi rm -f conftest.* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_protected_data" >&5 printf "%s\n" "$libc_cv_protected_data" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking linker support for INSERT in linker script" >&5 printf %s "checking linker support for INSERT in linker script... " >&6; } if test ${libc_cv_insert+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c < conftest.t <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then libc_cv_insert=yes fi rm -f conftest.* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_insert" >&5 printf "%s\n" "$libc_cv_insert" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for broken __attribute__((alias()))" >&5 printf %s "checking for broken __attribute__((alias()))... " >&6; } if test ${libc_cv_broken_alias_attribute+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then if grep 'xyzzy' conftest.s >/dev/null && grep 'abccb' conftest.s >/dev/null; then libc_cv_broken_alias_attribute=no fi fi rm -f conftest.c conftest.s fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_broken_alias_attribute" >&5 printf "%s\n" "$libc_cv_broken_alias_attribute" >&6; } if test $libc_cv_broken_alias_attribute = yes; then as_fn_error $? "working alias attribute support required" "$LINENO" 5 fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether to put _rtld_local into .sdata section" >&5 printf %s "checking whether to put _rtld_local into .sdata section... " >&6; } if test ${libc_cv_have_sdata_section+y} then : printf %s "(cached) " >&6 else $as_nop echo "int i;" > conftest.c libc_cv_have_sdata_section=no if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \ | grep '\.sdata' >/dev/null; then libc_cv_have_sdata_section=yes fi rm -f conftest.c conftest.so fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_have_sdata_section" >&5 printf "%s\n" "$libc_cv_have_sdata_section" >&6; } if test $libc_cv_have_sdata_section = yes; then printf "%s\n" "#define HAVE_SDATA_SECTION 1" >>confdefs.h fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libunwind-support in compiler" >&5 printf %s "checking for libunwind-support in compiler... " >&6; } if test ${libc_cv_cc_with_libunwind+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&1 >/dev/null | grep ' -lunwind ' >/dev/null; then libc_cv_cc_with_libunwind=yes else libc_cv_cc_with_libunwind=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_with_libunwind" >&5 printf "%s\n" "$libc_cv_cc_with_libunwind" >&6; } if test $libc_cv_cc_with_libunwind = yes; then printf "%s\n" "#define HAVE_CC_WITH_LIBUNWIND 1" >>confdefs.h fi ASFLAGS_config= { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether --noexecstack is desirable for .S files" >&5 printf %s "checking whether --noexecstack is desirable for .S files... " >&6; } if test ${libc_cv_as_noexecstack+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } \ && grep .note.GNU-stack conftest.s >/dev/null \ && { ac_try='${CC-cc} $ASFLAGS -Wa,--noexecstack -c -o conftest.o conftest.s 1>&5' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then libc_cv_as_noexecstack=yes else libc_cv_as_noexecstack=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_as_noexecstack" >&5 printf "%s\n" "$libc_cv_as_noexecstack" >&6; } if test $libc_cv_as_noexecstack = yes; then ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack" fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z execstack" >&5 printf %s "checking for linker that supports -z execstack... " >&6; } libc_linker_feature=no cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,-z,execstack -nostdlib \ -nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \ | grep "warning: -z execstack ignored" > /dev/null 2>&1; then true else libc_linker_feature=yes fi fi rm -f conftest* if test $libc_linker_feature = yes; then libc_cv_z_execstack=yes else libc_cv_z_execstack=no fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 printf "%s\n" "$libc_linker_feature" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z start-stop-gc" >&5 printf %s "checking for linker that supports -z start-stop-gc... " >&6; } libc_linker_feature=no cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,-z,start-stop-gc -nostdlib \ -nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \ | grep "warning: -z start-stop-gc ignored" > /dev/null 2>&1; then true else libc_linker_feature=yes fi fi rm -f conftest* if test $libc_linker_feature = yes; then libc_cv_z_start_stop_gc=yes else libc_cv_z_start_stop_gc=no fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 printf "%s\n" "$libc_linker_feature" >&6; } config_vars="$config_vars have-z-start-stop-gc = $libc_cv_z_start_stop_gc" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports --depaudit" >&5 printf %s "checking for linker that supports --depaudit... " >&6; } libc_linker_feature=no cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,--depaudit,x -nostdlib \ -nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \ | grep "warning: --depaudit ignored" > /dev/null 2>&1; then true else libc_linker_feature=yes fi fi rm -f conftest* if test $libc_linker_feature = yes; then libc_cv_depaudit=yes else libc_cv_depaudit=no fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 printf "%s\n" "$libc_linker_feature" >&6; } config_vars="$config_vars have-depaudit = $libc_cv_depaudit" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z pack-relative-relocs" >&5 printf %s "checking for linker that supports -z pack-relative-relocs... " >&6; } libc_linker_feature=no cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,-z,pack-relative-relocs -nostdlib \ -nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \ | grep "warning: -z pack-relative-relocs ignored" > /dev/null 2>&1; then true else libc_linker_feature=yes fi fi rm -f conftest* if test $libc_linker_feature = yes; then libc_cv_dt_relr=yes else libc_cv_dt_relr=no fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 printf "%s\n" "$libc_linker_feature" >&6; } config_vars="$config_vars have-dt-relr = $libc_cv_dt_relr" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports --no-dynamic-linker" >&5 printf %s "checking for linker that supports --no-dynamic-linker... " >&6; } libc_linker_feature=no cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -Wl,--no-dynamic-linker -nostdlib \ -nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \ | grep "warning: --no-dynamic-linker ignored" > /dev/null 2>&1; then true else libc_linker_feature=yes fi fi rm -f conftest* if test $libc_linker_feature = yes; then libc_cv_no_dynamic_linker=yes else libc_cv_no_dynamic_linker=no fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 printf "%s\n" "$libc_linker_feature" >&6; } config_vars="$config_vars have-no-dynamic-linker = $libc_cv_no_dynamic_linker" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -static-pie" >&5 printf %s "checking for -static-pie... " >&6; } if test ${libc_cv_static_pie+y} then : printf %s "(cached) " >&6 else $as_nop if { ac_try='${CC-cc} -static-pie -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_static_pie=yes else $as_nop libc_cv_static_pie=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie" >&5 printf "%s\n" "$libc_cv_static_pie" >&6; } config_vars="$config_vars have-static-pie = $libc_cv_static_pie" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fpie" >&5 printf %s "checking for -fpie... " >&6; } if test ${libc_cv_fpie+y} then : printf %s "(cached) " >&6 else $as_nop if { ac_try='${CC-cc} -fpie -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_fpie=yes else $as_nop libc_cv_fpie=no fi fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_fpie" >&5 printf "%s\n" "$libc_cv_fpie" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for GLOB_DAT reloc" >&5 printf %s "checking for GLOB_DAT reloc... " >&6; } if test ${libc_cv_has_glob_dat+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then libc_cv_has_glob_dat=yes else libc_cv_has_glob_dat=no fi else libc_cv_has_glob_dat=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_has_glob_dat" >&5 printf "%s\n" "$libc_cv_has_glob_dat" >&6; } { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -mtls-dialect=gnu2" >&5 printf %s "checking for -mtls-dialect=gnu2... " >&6; } if test ${libc_cv_mtls_dialect_gnu2+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then libc_cv_mtls_dialect_gnu2=yes else libc_cv_mtls_dialect_gnu2=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mtls_dialect_gnu2" >&5 printf "%s\n" "$libc_cv_mtls_dialect_gnu2" >&6; } config_vars="$config_vars have-mtls-dialect-gnu2 = $libc_cv_mtls_dialect_gnu2" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if -Wno-ignored-attributes is required for aliases" >&5 printf %s "checking if -Wno-ignored-attributes is required for aliases... " >&6; } if test ${libc_cv_wno_ignored_attributes+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then libc_cv_wno_ignored_attributes="-Wno-ignored-attributes" fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_wno_ignored_attributes" >&5 printf "%s\n" "$libc_cv_wno_ignored_attributes" >&6; } config_vars="$config_vars config-cflags-wno-ignored-attributes = $libc_cv_wno_ignored_attributes" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether cc puts quotes around section names" >&5 printf %s "checking whether cc puts quotes around section names... " >&6; } if test ${libc_cv_have_section_quotes+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c </dev/null; then libc_cv_have_section_quotes=yes else libc_cv_have_section_quotes=no fi else libc_cv_have_section_quotes=unknown fi rm -f conftest.{c,s} fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_have_section_quotes" >&5 printf "%s\n" "$libc_cv_have_section_quotes" >&6; } if test $libc_cv_have_section_quotes = yes; then printf "%s\n" "#define HAVE_SECTION_QUOTES 1" >>confdefs.h fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for __builtin_memset" >&5 printf %s "checking for __builtin_memset... " >&6; } if test ${libc_cv_gcc_builtin_memset+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <<\EOF void zero (void *x) { __builtin_memset (x, 0, 1000); } EOF if { ac_try='${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then libc_cv_gcc_builtin_memset=no else libc_cv_gcc_builtin_memset=yes fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_builtin_memset" >&5 printf "%s\n" "$libc_cv_gcc_builtin_memset" >&6; } if test "$libc_cv_gcc_builtin_memset" = yes ; then printf "%s\n" "#define HAVE_BUILTIN_MEMSET 1" >>confdefs.h fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for redirection of built-in functions" >&5 printf %s "checking for redirection of built-in functions... " >&6; } if test ${libc_cv_gcc_builtin_redirection+y} then : printf %s "(cached) " >&6 else $as_nop cat > conftest.c <<\EOF extern char *strstr (const char *, const char *) __asm ("my_strstr"); char *foo (const char *a, const char *b) { return __builtin_strstr (a, b); } EOF if { ac_try='${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; }; then libc_cv_gcc_builtin_redirection=yes else libc_cv_gcc_builtin_redirection=no fi rm -f conftest* fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_builtin_redirection" >&5 printf "%s\n" "$libc_cv_gcc_builtin_redirection" >&6; } if test "$libc_cv_gcc_builtin_redirection" = no; then as_fn_error $? "support for the symbol redirection needed" "$LINENO" 5 fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler option to disable generation of FMA instructions" >&5 printf %s "checking for compiler option to disable generation of FMA instructions... " >&6; } if test ${libc_cv_cc_nofma+y} then : printf %s "(cached) " >&6 else $as_nop libc_cv_cc_nofma= for opt in -ffp-contract=off -mno-fused-madd; do if { ac_try='${CC-cc} $opt -xc /dev/null -S -o /dev/null' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 test $ac_status = 0; }; } then : libc_cv_cc_nofma=$opt; break fi done fi { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_nofma" >&5 printf "%s\n" "$libc_cv_cc_nofma" >&6; } if test -n "$submachine"; then { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler option for CPU variant" >&5 printf %s "checking for compiler option for CPU variant... 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"SELinux explicitly required, but SELinux library not found" "$LINENO" 5 fi fi fi # Check if we're building with SELinux support. if test "x$have_selinux" = xyes; then printf "%s\n" "#define HAVE_SELINUX 1" >>confdefs.h # See if we have the libaudit library { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for audit_log_user_avc_message in -laudit" >&5 printf %s "checking for audit_log_user_avc_message in -laudit... " >&6; } if test ${ac_cv_lib_audit_audit_log_user_avc_message+y} then : printf %s "(cached) " >&6 else $as_nop ac_check_lib_save_LIBS=$LIBS LIBS="-laudit $LIBS" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ /* Override any GCC internal prototype to avoid an error. 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" >&6; } if test ${ac_cv_lib_cap_cap_init+y} then : printf %s "(cached) " >&6 else $as_nop ac_check_lib_save_LIBS=$LIBS LIBS="-lcap $LIBS" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ /* Override any GCC internal prototype to avoid an error. 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"Compiler doesn't provide necessary support for _FORTIFY_SOURCE=3" "$LINENO" 5 fi ;; #( *) : libc_cv_fortify_source=no ;; esac if test "$libc_cv_fortify_source" = yes then : fortify_source="${fortify_source},-D_FORTIFY_SOURCE=${enable_fortify_source}" fi config_vars="$config_vars supported-fortify = $libc_cv_supported_fortify_source" { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the assembler requires one version per symbol" >&5 printf %s "checking whether the assembler requires one version per symbol... 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