From 38e87ea0415eda38c3e5b926d20b49f6849e3013 Mon Sep 17 00:00:00 2001 From: Maxim Dounin Date: Mon, 15 May 2017 20:09:43 +0300 Subject: [PATCH] Configure: disabled gcc atomics with Sun C (ticket #1261). 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. --- auto/cc/conf | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/auto/cc/conf b/auto/cc/conf index 49af718c3..afbca62bc 100644 --- a/auto/cc/conf +++ b/auto/cc/conf @@ -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