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-rw-r--r--include/my_compiler.h26
1 files changed, 25 insertions, 1 deletions
diff --git a/include/my_compiler.h b/include/my_compiler.h
index 1cd46ff4260..e3ff80fad40 100644
--- a/include/my_compiler.h
+++ b/include/my_compiler.h
@@ -32,8 +32,15 @@
/* GNU C/C++ */
#if defined __GNUC__
+/* Convenience macro to test the minimum required GCC version. */
+# define MY_GNUC_PREREQ(maj, min) \
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
/* Any after 2.95... */
# define MY_ALIGN_EXT
+/* Comunicate to the compiler the unreachability of the code. */
+# if MY_GNUC_PREREQ(4,5)
+# define MY_ASSERT_UNREACHABLE() __builtin_unreachable()
+# endif
/* Microsoft Visual C++ */
#elif defined _MSC_VER
@@ -67,8 +74,13 @@
#endif
/**
- Generic compiler-dependent features.
+ Generic (compiler-independent) features.
*/
+
+#ifndef MY_GNUC_PREREQ
+# define MY_GNUC_PREREQ(maj, min) (0)
+#endif
+
#ifndef MY_ALIGNOF
# ifdef __cplusplus
template<typename type> struct my_alignof_helper { char m1; type m2; };
@@ -79,6 +91,10 @@
# endif
#endif
+#ifndef MY_ASSERT_UNREACHABLE
+# define MY_ASSERT_UNREACHABLE() do { assert(0); } while (0)
+#endif
+
/**
C++ Type Traits
*/
@@ -124,6 +140,14 @@ struct my_aligned_storage
#endif /* __cplusplus */
+# ifndef MY_ALIGNED
+/*
+ Make sure MY_ALIGNED can be used also on platforms where we don't
+ have a way of aligning data structures.
+*/
+#define MY_ALIGNED(size)
+#endif
+
#include <my_attribute.h>
#endif /* MY_COMPILER_INCLUDED */