git-compat-util: avoid redeclaring _DEFAULT_SOURCE

dscho · Git for Windows Build Agent · commit 64a9c8b001c1 · 2025-06-05T22:08:28.000Z
We are about to vendor in `mimalloc`'s source code which we will want to
include `compat/posix.h` after defining that constant.

Signed-off-by: Johannes Schindelin &lt;johannes.schindelin@gmx.de&gt;
diff --git a/compat/posix.h b/compat/posix.h
@@ -70,7 +70,9 @@
 #define _ALL_SOURCE 1
 #define _GNU_SOURCE 1
 #define _BSD_SOURCE 1
+#ifndef _DEFAULT_SOURCE
 #define _DEFAULT_SOURCE 1
+#endif
 #define _NETBSD_SOURCE 1
 #define _SGI_SOURCE 1
 
