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libvduse: Provide _GNU_SOURCE when compiling outside of QEMU

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When the libvduse sources are used by another project, it can not be
guaranteed that _GNU_SOURCE is set by the build system. If it is for
example not set, errors like this show up.

  CC       libvduse.o
libvduse.c: In function ‘vduse_log_get’:
libvduse.c:172:9: error: implicit declaration of function ‘ftruncate’; did you mean ‘strncat’? [-Werror=implicit-function-declaration]
  172 |     if (ftruncate(fd, size) == -1) {
      |         ^~~~~~~~~
      |         strncat

The simplest way to allow external complication of libvduse.[ch] by
setting _GNU_SOURCE if it is not already set by the build system.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Message-Id: <407f3665f0605df936e5bfe60831d180edfb8cca.1671741278.git.marcel@holtmann.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marcel Holtmann 2022-12-22 21:36:46 +01:00 committed by Paolo Bonzini
parent f1c563d209
commit 518ac42879
1 changed files with 4 additions and 0 deletions
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subprojects/libvduse/libvduse.c
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@ -16,6 +16,10 @@
* later. See the COPYING file in the top-level directory.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>