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v3.0.x: configury: fix gcc builtin atomic detection #3803

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Merged
merged 1 commit into from
Jul 6, 2017
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v3.0.x: configury: fix gcc builtin atomic detection #3803

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13 changes: 11 additions & 2 deletions config/opal_config_asm.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -193,14 +193,23 @@ AC_DEFUN([OPAL_CHECK_GCC_BUILTIN_CSWAP_INT128], [
AC_DEFUN([OPAL_CHECK_GCC_ATOMIC_BUILTINS], [
AC_MSG_CHECKING([for __atomic builtin atomics])

AC_TRY_LINK([long tmp, old = 0;], [__atomic_thread_fence(__ATOMIC_SEQ_CST);
AC_TRY_LINK([
#include <stdint.h>
uint32_t tmp, old = 0;
uint64_t tmp64, old64 = 0;], [
__atomic_thread_fence(__ATOMIC_SEQ_CST);
__atomic_compare_exchange_n(&tmp, &old, 1, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
__atomic_add_fetch(&tmp, 1, __ATOMIC_RELAXED);],
__atomic_add_fetch(&tmp, 1, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&tmp64, &old64, 1, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
__atomic_add_fetch(&tmp64, 1, __ATOMIC_RELAXED);],
[AC_MSG_RESULT([yes])
$1],
[AC_MSG_RESULT([no])
$2])

AC_DEFINE_UNQUOTED([OPAL_ASM_SYNC_HAVE_64BIT],[$opal_asm_sync_have_64bit],
[Whether 64-bit is supported by the __sync builtin atomics])

# Check for 128-bit support
OPAL_CHECK_GCC_BUILTIN_CSWAP_INT128
])
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