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mdbx: use __GNUC_PREREQ and __GNUC_PREREQ.

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Change-Id: Ib1927f6ab2e3397fb2a0e83a73c5c0252bc8a593
This commit is contained in:
Leo Yuriev 2016-06-09 15:23:47 +03:00
parent 9c5d029417
commit 6d99bb59a8
2 changed files with 40 additions and 27 deletions
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37
mdb.c
View File

@ -58,6 +58,36 @@
# define MDB_DEBUG 0
#endif
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
/* LY: Please do not ask us for Windows support, just never!
* But you can make a fork for Windows, or become maintainer for FreeBSD... */
#ifndef __gnu_linux__
# warning "ReOpenMDBX supports only GNU Linux"
#endif
#include <features.h>
#if !defined(__GNUC__) || !__GNUC_PREREQ(4,2)
/* LY: Actualy ReOpenMDBX was not tested with compilers
* older than GCC 4.4 (from RHEL6).
* But you could remove this #error and try to continue at your own risk.
* In such case please don't rise up an issues related ONLY to old compilers.
*/
# warning "ReOpenMDBX required at least GCC 4.2 compatible C/C++ compiler."
#endif
#if !defined(__GNU_LIBRARY__) || !__GLIBC_PREREQ(2,12)
/* LY: Actualy ReOpenMDBX was not tested with something
* older than glibc 2.12 (from RHEL6).
* But you could remove this #error and try to continue at your own risk.
* In such case please don't rise up an issues related ONLY to old systems.
*/
# warning "ReOpenMDBX required at least GLIBC 2.12."
#endif
#include "./reopen.h"
#include "./barriers.h"
@ -175,11 +205,8 @@
#ifndef MDB_USE_ROBUST
/* Howard Chu: Android currently lacks Robust Mutex support */
# if defined(EOWNERDEAD) && !defined(ANDROID) \
/* LY: glibc before 2.10 has a troubles with Robust Mutex too.
* But more over:
* - we couldn't test code with glibc < 2.12;
* - we won't provide compatibility with old systems. */ \
&& !(defined(__GLIBC__) && ((__GLIBC__ << 16)|__GLIBC_MINOR__) < 0x02000c)
/* LY: glibc before 2.10 has a troubles with Robust Mutex too. */ \
&& __GLIBC_PREREQ(2,10)
# define MDB_USE_ROBUST 1
# else
# define MDB_USE_ROBUST 0

30
reopen.h
View File

@ -19,31 +19,17 @@
*
*/
/* LY: Please do not ask us for Windows support, just never!
* But you can make a fork for Windows, or become maintainer for FreeBSD... */
#ifndef __gnu_linux__
# error "MDBX supports only GNU Linux"
#endif
#if !defined(__GNUC__) || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
/* LY: Actualy MDBX was not tested with compilers
* older than GCC 4.4 from RHEL6, and clang 3.6 from Ubuntu.
* But you could remove this #error and try to continue at your own risk.
* In such case please don't rise up an issues related ONLY to old compilers.
*/
# error "MDBX required at least GCC 4.2 compatible C/C++ compiler."
#endif
#ifndef _REOPEN_H
#define _REOPEN_H
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#if !defined(GCC_VERSION) && defined(__GNUC__)
# define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#endif /* GCC_VERSION */
#ifndef __CLANG_PREREQ
# ifdef __clang__
# define __CLANG_PREREQ(maj,min) \
((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
# else
# define __CLANG_PREREQ(maj,min) (0)
# endif
#endif /* __CLANG_PREREQ */
#ifndef __has_attribute
# define __has_attribute(x) (0)