diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/configure.in b/configure.in index 300bba65bc..1a21191940 100644 --- a/configure.in +++ b/configure.in @@ -1384,8 +1384,8 @@ dnl AC_CHECK_ASM_UNDERSCORE([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]) AC_DEFUN(AC_CHECK_ASM_UNDERSCORE, [cat > conftest.$ac_ext <<EOF dnl This sometimes fails to find confdefs.h, for some reason. -dnl [#]line __oline__ "[$]0" -[#]line __oline__ "configure" +dnl [#]line $LINENO "[$]0" +[#]line $LINENO "configure" #include "confdefs.h" void underscore_test(void) { return; } @@ -1587,7 +1587,7 @@ fi AC_CACHE_CHECK(for DWARF2 unwind info support, libc_cv_gcc_dwarf2_unwind_info, [cat > conftest.c <<EOF -#line __oline__ "configure" +#line $LINENO "configure" static char *__EH_FRAME_BEGIN__; _start () { @@ -1653,7 +1653,7 @@ esac dnl Check whether compiler understands __builtin_expect. AC_CACHE_CHECK(for __builtin_expect, libc_cv_gcc_builtin_expect, [cat > conftest.c <<EOF -#line __oline__ "configure" +#line $LINENO "configure" int foo (int a) { a = __builtin_expect (a, 10); @@ -1691,11 +1691,31 @@ if test "$libc_cv_gcc_builtin_memset" = yes ; then AC_DEFINE(HAVE_BUILTIN_MEMSET) fi +AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl +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 +dnl +if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]); +then + libc_cv_gcc_builtin_redirection=yes +else + libc_cv_gcc_builtin_redirection=no +fi +rm -f conftest* ]) +if test "$libc_cv_gcc_builtin_redirection" = yes ; then + AC_DEFINE(HAVE_BUILTIN_REDIRECTION) +fi + dnl Check whether the compiler supports subtraction of local labels. AC_CACHE_CHECK(for local label subtraction, libc_cv_gcc_subtract_local_labels, [cat > conftest.c <<EOF changequote(,)dnl -#line __oline__ "configure" +#line $LINENO "configure" int foo (int a) { static const int ar[] = { &&l1 - &&l1, &&l2 - &&l1 }; |