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gcc.h: add macro GCC_CHECK_VERSION

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This commit is contained in:
Max Kellermann 2011-09-15 09:22:48 +02:00
parent 46ed717af4
commit d0c85a5a96
1 changed files with 6 additions and 1 deletions
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7
src/gcc.h
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@ -20,13 +20,18 @@
#ifndef MPD_GCC_H
#define MPD_GCC_H
#define GCC_CHECK_VERSION(major, minor) \
(defined(__GNUC__) && \
(__GNUC__ > (major) || \
(__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))))
/* this allows us to take advantage of special gcc features while still
* allowing other compilers to compile:
*
* example taken from: http://rlove.org/log/2005102601
*/
#if defined(__GNUC__) && (__GNUC__ >= 3)
#if GCC_CHECK_VERSION(3,0)
# define gcc_must_check __attribute__ ((warn_unused_result))
# define gcc_packed __attribute__ ((packed))
/* these are very useful for type checking */