diff options
Diffstat (limited to 'sysdeps/sparc/sparc32/configure.ac')
| -rw-r--r-- | sysdeps/sparc/sparc32/configure.ac | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc32/configure.ac b/sysdeps/sparc/sparc32/configure.ac index 2e336f5c16..462a423a2e 100644 --- a/sysdeps/sparc/sparc32/configure.ac +++ b/sysdeps/sparc/sparc32/configure.ac @@ -11,3 +11,27 @@ AC_CACHE_CHECK([for at least sparcv8 support], if test $libc_cv_sparcv8 = no; then AC_MSG_ERROR([no support for pre-v8 sparc]) fi + +# Test if compiler generates external calls to libatomic for CAS operation. +# It is suffice to check for int only and the test is similar of C11 +# atomic_compare_exchange_strong using GCC builtins. +AC_CACHE_CHECK(for external libatomic calls, + libc_cv_cas_uses_libatomic, + [cat > conftest.c <<EOF + _Bool foo (int *ptr, int *expected, int desired) + { + return __atomic_compare_exchange_n (ptr, expected, desired, 0, + __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + } +EOF + libc_cv_cas_uses_libatomic=no + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); 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 + ]) +if test $libc_cv_cas_uses_libatomic = yes; then + AC_MSG_ERROR([external dependency of libatomic is not supported]) +fi |