changeset 56772eb01583 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=56772eb01583
description:
base: Add compiler macros for C++11 final/override
Add the macros M5_ATTR_FINAL and M5_ATTR_OVERRIDE which are defined to
final and override respectively if supported by the compiler. This is
done to allow a smooth transition to gcc >= 4.7.
diffstat:
src/base/compiler.hh | 50 ++++++++++++++++++++++++++++++++++++++------------
1 files changed, 38 insertions(+), 12 deletions(-)
diffs (65 lines):
diff -r b7715fb7cf9f -r 56772eb01583 src/base/compiler.hh
--- a/src/base/compiler.hh Tue Aug 26 10:13:31 2014 -0400
+++ b/src/base/compiler.hh Tue Aug 26 10:13:33 2014 -0400
@@ -43,23 +43,49 @@
#ifndef __BASE_COMPILER_HH__
#define __BASE_COMPILER_HH__
+// gcc C++11 status: http://gcc.gnu.org/projects/cxx0x.html
+// clang C++11 status: http://clang.llvm.org/cxx_status.html
// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
-#if defined(__GNUC__)
-#define M5_ATTR_NORETURN __attribute__((noreturn))
-#define M5_DUMMY_RETURN
-#define M5_VAR_USED __attribute__((unused))
+/* Support for override control (final/override) */
+#undef M5_COMP_HAS_OVERRIDE_CONTROL
+
+#if defined(__GNUC__) && !defined(__clang__) /* Check for gcc */
+
+# define M5_GCC_VERSION(maj, min) \
+ (__GNUC__ > (maj) || (__GNUC__ == (maj) && __GNUC_MINOR__ >= (min)))
+
+# define M5_COMP_HAS_OVERRIDE_CONTROL M5_GCC_VERSION(4, 7)
+
+#elif defined(__clang__) /* Check for clang */
+
+# define M5_COMP_HAS_OVERRIDE_CONTROL __has_feature(cxx_override_control)
+
+#else
+# error "Need to define compiler options in base/compiler.hh"
+#endif
+
+
+#if M5_COMP_HAS_OVERRIDE_CONTROL
+# define M5_ATTR_FINAL final
+# define M5_ATTR_OVERRIDE override
+#else
+# define M5_ATTR_FINAL
+# define M5_ATTR_OVERRIDE
+#endif
+
+#if defined(__GNUC__) // clang or gcc
+# define M5_ATTR_NORETURN __attribute__((noreturn))
+# define M5_DUMMY_RETURN
+# define M5_VAR_USED __attribute__((unused))
+# define M5_ATTR_PACKED __attribute__ ((__packed__))
+# define M5_NO_INLINE __attribute__ ((__noinline__))
+#endif
#if defined(__clang__)
-#define M5_CLASS_VAR_USED M5_VAR_USED
+# define M5_CLASS_VAR_USED M5_VAR_USED
#else
-#define M5_CLASS_VAR_USED
-#endif
-
-#define M5_ATTR_PACKED __attribute__ ((__packed__))
-#define M5_NO_INLINE __attribute__ ((__noinline__))
-#else
-#error "Need to define compiler options in base/compiler.hh"
+# define M5_CLASS_VAR_USED
#endif
#endif // __BASE_COMPILER_HH__
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