Merge branch 'master' into dev

[libcds.git] / cds / compiler / gcc / defs.h

diff --git a/cds/compiler/gcc/defs.h b/cds/compiler/gcc/defs.h
index 32b02c88236a4e3373fa023129c7467de6ce4876..c8aaf832777b6ed9ccd3cd060da2fe822f5d3861 100644 (file)
--- a/cds/compiler/gcc/defs.h
+++ b/cds/compiler/gcc/defs.h
@@ -75,7 +75,10 @@
 // *************************************************
 // Features
 // If you run under Thread Sanitizer, pass -DCDS_THREAD_SANITIZER_ENABLED in compiler command line
-//#define CDS_THREAD_SANITIZER_ENABLED
+// UPD: Seems, GCC 5+ has predefined macro __SANITIZE_THREAD__, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64354
+#if defined(__SANITIZE_THREAD__) && !defined(CDS_THREAD_SANITIZER_ENABLED)
+#   define CDS_THREAD_SANITIZER_ENABLED
+#endif
 
 // *************************************************
 // Alignment macro
@@ -97,26 +100,39 @@
 #   define CDS_DEPRECATED( reason ) __attribute__((deprecated( reason )))
 #endif
 
+#define CDS_NORETURN __attribute__((__noreturn__))
+
 // likely/unlikely
 
 #define cds_likely( expr )   __builtin_expect( !!( expr ), 1 )
 #define cds_unlikely( expr ) __builtin_expect( !!( expr ), 0 )
 
+// Exceptions
+
+#if defined( __EXCEPTIONS ) && __EXCEPTIONS == 1
+#   define CDS_EXCEPTION_ENABLED
+#endif
+
 // double-width CAS support
 // note: gcc-4.8 does not support double-word atomics
 //       gcc-4.9: a lot of crashes when use DCAS
+//       gcc-7: 128-bit atomic is not lock-free, see https://gcc.gnu.org/ml/gcc/2017-01/msg00167.html
+// 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 ) && CDS_COMPILER_VERSION < 70000
 #           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
 #endif
 
+
 #include <cds/compiler/gcc/compiler_barriers.h>
 
 #endif // #ifndef CDSLIB_COMPILER_GCC_DEFS_H