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Configure: disabled gcc atomics with Sun C (ticket #1261).

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Oracle Developer Studio 12.5 introduced GCC-compatible __sync builtins.
Unfortunately, these builtins are neither GCC-compatible (they generate
warnings when used with volatile), nor working (unexpectedly fail on
unpredictable combinations of code layout and compiler flags).  As such,
the gcc builtin atomic operations configure test explicitly disabled when
compiling with Sun C.
This commit is contained in:
Maxim Dounin 2017-05-15 20:09:43 +03:00
parent 2cabd63422
commit be7d7499e5
1 changed files with 19 additions and 15 deletions
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34
auto/cc/conf
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@ -178,21 +178,25 @@ if [ "$NGX_PLATFORM" != win32 ]; then
fi
ngx_feature="gcc builtin atomic operations"
ngx_feature_name=NGX_HAVE_GCC_ATOMIC
ngx_feature_run=yes
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="long n = 0;
if (!__sync_bool_compare_and_swap(&n, 0, 1))
return 1;
if (__sync_fetch_and_add(&n, 1) != 1)
return 1;
if (n != 2)
return 1;
__sync_synchronize();"
. auto/feature
if [ "$NGX_CC_NAME" = "sunc" ]; then
echo "checking for gcc builtin atomic operations ... disabled"
else
ngx_feature="gcc builtin atomic operations"
ngx_feature_name=NGX_HAVE_GCC_ATOMIC
ngx_feature_run=yes
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="long n = 0;
if (!__sync_bool_compare_and_swap(&n, 0, 1))
return 1;
if (__sync_fetch_and_add(&n, 1) != 1)
return 1;
if (n != 2)
return 1;
__sync_synchronize();"
. auto/feature
fi
if [ "$NGX_CC_NAME" = "ccc" ]; then