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Work around g++ atomic builtins detection in configure when -Os is used.

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Assigning __sync_sub_and_fetch() result to an unused variable can result in it
being optimized away and the function support is then not really tested for,
see #4542. So do make sure this variable is kept by making it volatile.

Closes #15555.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74934 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2013-10-04 23:48:22 +00:00
parent 37da97096b
commit 15a1c3b2ef
2 changed files with 2 additions and 2 deletions
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2
build/aclocal/atomic_builtins.m4
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@ -16,7 +16,7 @@ AC_DEFUN([WX_ATOMIC_BUILTINS],
__sync_fetch_and_add(&value, 2);
__sync_sub_and_fetch(&value, 1);
/* but wxAtomicDec does, so mimic that: */
unsigned int r2 = __sync_sub_and_fetch(&value, 1);
volatile unsigned int r2 = __sync_sub_and_fetch(&value, 1);
],
wx_cv_cc_gcc_atomic_builtins=yes,
wx_cv_cc_gcc_atomic_builtins=no)

2
configure vendored
View File

@ -21867,7 +21867,7 @@ main ()
__sync_fetch_and_add(&value, 2);
__sync_sub_and_fetch(&value, 1);
/* but wxAtomicDec does, so mimic that: */
unsigned int r2 = __sync_sub_and_fetch(&value, 1);
volatile unsigned int r2 = __sync_sub_and_fetch(&value, 1);
;
return 0;