diff options
Diffstat (limited to 'sysdeps/sparc/sparc32/configure')
| -rw-r--r-- | sysdeps/sparc/sparc32/configure | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc32/configure b/sysdeps/sparc/sparc32/configure index d7f16b1de0..b6ec0e7d8f 100644 --- a/sysdeps/sparc/sparc32/configure +++ b/sysdeps/sparc/sparc32/configure @@ -160,3 +160,38 @@ $as_echo "$libc_cv_sparcv8" >&6; } if test $libc_cv_sparcv8 = no; then as_fn_error $? "no support for pre-v8 sparc" "$LINENO" 5 fi + +# Test if compiler generates external calls to libatomic for CAS operation. +# It is suffice to check for int only and the test is similar of C11 +# atomic_compare_exchange_strong using GCC builtins. +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for external libatomic calls" >&5 +$as_echo_n "checking for external libatomic calls... " >&6; } +if ${libc_cv_cas_uses_libatomic+:} false; then : + $as_echo_n "(cached) " >&6 +else + cat > conftest.c <<EOF + _Bool foo (int *ptr, int *expected, int desired) + { + return __atomic_compare_exchange_n (ptr, expected, desired, 0, + __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + } +EOF + libc_cv_cas_uses_libatomic=no + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5' + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 + test $ac_status = 0; }; }; then + if grep '__atomic_compare_exchange_4' conftest.s >/dev/null; then + libc_cv_cas_uses_libatomic=yes + fi + fi + rm -f conftest.c conftest.s + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cas_uses_libatomic" >&5 +$as_echo "$libc_cv_cas_uses_libatomic" >&6; } +if test $libc_cv_cas_uses_libatomic = yes; then + as_fn_error $? "external dependency of libatomic is not supported" "$LINENO" 5 +fi |