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base: Add compiler macros for C++11 final/override

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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.
This commit is contained in:
Andreas Sandberg
2014-08-26 10:13:33 -04:00
parent 0da99b7e0c
commit f3e5fee743
1 changed files with 36 additions and 10 deletions
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46
src/base/compiler.hh
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@@ -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)
#if defined(__clang__)
#define M5_CLASS_VAR_USED M5_VAR_USED
#else
#define M5_CLASS_VAR_USED
# error "Need to define compiler options in base/compiler.hh"
#endif
#define M5_ATTR_PACKED __attribute__ ((__packed__))
#define M5_NO_INLINE __attribute__ ((__noinline__))
#if M5_COMP_HAS_OVERRIDE_CONTROL
# define M5_ATTR_FINAL final
# define M5_ATTR_OVERRIDE override
#else
#error "Need to define compiler options in base/compiler.hh"
# 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
#else
# define M5_CLASS_VAR_USED
#endif
#endif // __BASE_COMPILER_HH__