From: khizmax <libcds.dev@gmail.com>
Date: Wed, 3 May 2017 20:46:48 +0000 (+0300)
Subject: Added ability to manually suppress wide-atomic support in compiler command line:
X-Git-Tag: v2.3.0~46
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8594e61e616b35bc8ca382652edbdab2ed9a4382;p=libcds.git

Added ability to manually suppress wide-atomic support in compiler command line:
 for 64bit platform: -DCDS_DISABLE_128BIT_ATOMIC
 for 32bit platform: -DCDS_DISABLE_64BIT_ATOMIC
---

diff --git a/cds/compiler/clang/defs.h b/cds/compiler/clang/defs.h
index 246456e8..8144de3f 100644
--- a/cds/compiler/clang/defs.h
+++ b/cds/compiler/clang/defs.h
@@ -140,13 +140,16 @@
 
 
 // double-width CAS support - only for libc++
+// You can manually suppress wide-atomic support by defining in compiler command line:
+//  for 64bit platform: -DCDS_DISABLE_128BIT_ATOMIC
+//  for 32bit platform: -DCDS_DISABLE_64BIT_ATOMIC
 #ifdef _LIBCPP_VERSION
 #   if CDS_BUILD_BITS == 64
-#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
+#       if !defined( CDS_DISABLE_128BIT_ATOMIC ) && defined( __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 )
 #           define CDS_DCAS_SUPPORT
 #       endif
 #   else
-#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+#       if !defined( CDS_DISABLE_64BIT_ATOMIC ) && defined( __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 )
 #           define CDS_DCAS_SUPPORT
 #       endif
 #   endif
diff --git a/cds/compiler/gcc/defs.h b/cds/compiler/gcc/defs.h
index 0d8e5c45..2f78f697 100644
--- a/cds/compiler/gcc/defs.h
+++ b/cds/compiler/gcc/defs.h
@@ -113,13 +113,16 @@
 // double-width CAS support
 // note: gcc-4.8 does not support double-word atomics
 //       gcc-4.9: a lot of crashes when use DCAS
+// You can manually suppress wide-atomic support by defining in compiler command line:
+//  for 64bit platform: -DCDS_DISABLE_128BIT_ATOMIC
+//  for 32bit platform: -DCDS_DISABLE_64BIT_ATOMIC
 #if CDS_COMPILER_VERSION >= 50000
 #   if CDS_BUILD_BITS == 64
-#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
+#       if !defined( CDS_DISABLE_128BIT_ATOMIC ) && defined( __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 )
 #           define CDS_DCAS_SUPPORT
 #       endif
 #   else
-#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+#       if !defined( CDS_DISABLE_64BIT_ATOMIC ) && defined( __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 )
 #           define CDS_DCAS_SUPPORT
 #       endif
 #   endif