From afe04691aca3f669f517adaeb5bd4a87a481fb4a Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Wed, 27 May 2020 01:26:30 +0100 Subject: Squashed 'third_party/glog/' content from commit 9ef754a3023 git-subtree-dir: third_party/glog git-subtree-split: 9ef754a3023e6fd10f20fe53dfca96dd898182e3 --- m4/ac_have_sync_val_compare_and_swap.m4 | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 m4/ac_have_sync_val_compare_and_swap.m4 (limited to 'm4/ac_have_sync_val_compare_and_swap.m4') diff --git a/m4/ac_have_sync_val_compare_and_swap.m4 b/m4/ac_have_sync_val_compare_and_swap.m4 new file mode 100644 index 000000000000..88b027e23a29 --- /dev/null +++ b/m4/ac_have_sync_val_compare_and_swap.m4 @@ -0,0 +1,14 @@ +AC_DEFUN([AX_C___SYNC_VAL_COMPARE_AND_SWAP], [ + AC_MSG_CHECKING(for __sync_val_compare_and_swap) + AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [ + AC_TRY_LINK( + [], + [int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;], + ac_cv___sync_val_compare_and_swap=yes, + ac_cv___sync_val_compare_and_swap=no + )]) + if test "$ac_cv___sync_val_compare_and_swap" = "yes"; then + AC_DEFINE(HAVE___SYNC_VAL_COMPARE_AND_SWAP, 1, [define if your compiler has __sync_val_compare_and_swap]) + fi + AC_MSG_RESULT($ac_cv___sync_val_compare_and_swap) +]) -- cgit 1.4.1