diff options
| author | glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-11-26 02:45:53 +0000 |
|---|---|---|
| committer | glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-11-26 02:45:53 +0000 |
| commit | 0791c940ad9c4749e72accb91c7e22e684fde668 (patch) | |
| tree | c82d6024bc65b84a2bc7c2fdbc3d6ec2ea181e0f /configure.in | |
| parent | 6295a023a5907af6f984aa5eeb9e64f99c5acf2b (diff) | |
* ruby_atomic.h: use __atomic builtin functions supported by GCC.
__sync family are legacy functions now and it is recommended
that new code use the __atomic functions.
http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
* configure.in: check existence of __atomic functions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43851 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/configure.in b/configure.in index 1e0550d187..1a6379cb4a 100644 --- a/configure.in +++ b/configure.in @@ -1480,13 +1480,14 @@ if test "$GCC" = yes; then AC_DEFINE_UNQUOTED([RUBY_ALIAS_FUNCTION_VOID(prot, name, args)], [RUBY_ALIAS_FUNCTION_TYPE(void, prot, name, args)]) fi - AC_CACHE_CHECK([for atomic builtins], [rb_cv_gcc_atomic_builtins], [ + + AC_CACHE_CHECK([for __atomic builtins], [rb_cv_gcc_atomic_builtins], [ AC_TRY_LINK([unsigned char atomic_var;], [ - __sync_lock_test_and_set(&atomic_var, 0); - __sync_lock_test_and_set(&atomic_var, 1); - __sync_fetch_and_add(&atomic_var, 1); - __sync_fetch_and_sub(&atomic_var, 1); + __atomic_exchange_n(&atomic_var, 0, __ATOMIC_SEQ_CST); + __atomic_exchange_n(&atomic_var, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&atomic_var, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_sub(&atomic_var, 1, __ATOMIC_SEQ_CST); ], [rb_cv_gcc_atomic_builtins=yes], [rb_cv_gcc_atomic_builtins=no])]) @@ -1494,6 +1495,20 @@ if test "$GCC" = yes; then AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS) fi + AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [ + AC_TRY_LINK([unsigned char atomic_var;], + [ + __sync_lock_test_and_set(&atomic_var, 0); + __sync_lock_test_and_set(&atomic_var, 1); + __sync_fetch_and_add(&atomic_var, 1); + __sync_fetch_and_sub(&atomic_var, 1); + ], + [rb_cv_gcc_sync_builtins=yes], + [rb_cv_gcc_sync_builtins=no])]) + if test "$rb_cv_gcc_sync_builtins" = yes; then + AC_DEFINE(HAVE_GCC_SYNC_BUILTINS) + fi + AC_CACHE_CHECK(for __builtin_unreachable, rb_cv_func___builtin_unreachable, [RUBY_WERROR_FLAG( [AC_TRY_LINK([@%:@include <stdlib.h>], |