From 518ac42879560e656a62c3f4ed16569cc169202b Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Thu, 22 Dec 2022 21:36:46 +0100 Subject: [PATCH] libvduse: Provide _GNU_SOURCE when compiling outside of QEMU MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Message-Id: <407f3665f0605df936e5bfe60831d180edfb8cca.1671741278.git.marcel@holtmann.org> Signed-off-by: Paolo Bonzini --- subprojects/libvduse/libvduse.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/subprojects/libvduse/libvduse.c b/subprojects/libvduse/libvduse.c index e089d4d546..c871bd331a 100644 --- a/subprojects/libvduse/libvduse.c +++ b/subprojects/libvduse/libvduse.c @@ -16,6 +16,10 @@ * later. See the COPYING file in the top-level directory. */ +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + #include #include #include