Then the libvhost-user 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 libvhost-user.o
libvhost-user.c: In function ‘vu_panic’:
libvhost-user.c:195:9: error: implicit declaration of function ‘vasprintf’; did
you mean ‘vsprintf’? [-Werror=implicit-function-declaration]
195 | if (vasprintf(&buf, msg, ap) < 0) {
| ^~~~~~~~~
| vsprintf
The simplest way to allow external complication of libvhost-user.[ch] is
by setting _GNU_SOURCE if it is not already set by the build system.
Signed-off-by: Marcel Holtmann <mar...@holtmann.org>
---
subprojects/libvhost-user/libvhost-user.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/subprojects/libvhost-user/libvhost-user.c
b/subprojects/libvhost-user/libvhost-user.c
index d6ee6e7d9168..b55b9e244d9a 100644
--- a/subprojects/libvhost-user/libvhost-user.c
+++ b/subprojects/libvhost-user/libvhost-user.c
@@ -13,6 +13,10 @@
* later. See the COPYING file in the top-level directory.
*/
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
/* this code avoids GLib dependency */
#include <stdlib.h>
#include <stdio.h>
--
2.38.1
