[PATCH 1/1] Fix build on CYGWIN & MinGW. The macro _GNU_SOURCE isn't defined by default on CYGWIN and MinGW, but it must be added otherwise it won't find the prototypes of several functions.

[Carlo Bramini]

From: Carlo Bramini <carlo_bramini(a)users.sourceforge.net>

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2d841d0d496..9bbeb0112fc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -603,7 +603,7 @@ case $host_os in
   cygwin*|mingw32*)
     LIBEXT="dll"
     DLLEXT=""
-    EXTRACFLAGS="-D__WINE_PE_BUILD"
+    EXTRACFLAGS="-D__WINE_PE_BUILD -D_GNU_SOURCE"
     dnl Disable stdcall fixups to catch prototype mismatches
     AS_VAR_IF([HOST_ARCH],[i386],
         [WINE_TRY_CFLAGS([-Wl,--disable-stdcall-fixup],
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/6387