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compat/nedmalloc: Fix compiler warnings on linux

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On linux, when the build variable USE_NED_ALLOCATOR is set, gcc
issues the following warnings:

    In file included from compat/nedmalloc/nedmalloc.c:63:
    .../malloc.c.h: In function 'mmap_resize':
    .../malloc.c.h:3762: warning: implicit declaration of function 'mremap'
    .../malloc.c.h: In function 'sys_trim':
    .../malloc.c.h:4195: warning: comparison between pointer and integer

The warnings are caused by the <sys/mman.h> header not enabling the
(conditional) declaration of the mremap() function.  The declaration
can be enabled by defining the _GNU_SOURCE symbol prior to including
certain system header files. In particular, it may not be sufficient
to simply define _GNU_SOURCE just prior to including the <sys/mman.h>
header. (e.g. defining the symbol after including <sys/types.h> will
be completely ineffective.)

In order to suppress the warnings, we define the _GNU_SOURCE symbol
at the start of the malloc.c.h header file.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ramsay Jones
2013-04-27 19:46:17 +01:00
committed by Junio C Hamano
parent 241c957d89
commit eec7fd8bc5
1 changed files with 4 additions and 0 deletions
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4
compat/nedmalloc/malloc.c.h
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@ -484,6 +484,10 @@ MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP
#define DLMALLOC_VERSION 20804
#endif /* DLMALLOC_VERSION */
#if defined(linux)
#define _GNU_SOURCE 1
#endif
#ifndef WIN32
#ifdef _WIN32
#define WIN32 1