Johannes Sixt  committed 35eeef4

Windows: Make sure argv[0] has a path

Since the exec-path on Windows is derived from the program invocation path,
we must ensure that argv[0] always has a path. Unfortunately, if a program
is invoked from CMD, argv[0] has no path. But on the other hand, the
C runtime offers a global variable, _pgmptr, that always has the full path
to the program. We hook into main() with a preprocessor macro, where we
replace argv[0].

Signed-off-by: Johannes Sixt <>
Signed-off-by: Junio C Hamano <>

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File compat/mingw.h

 char **copy_environ(void);
 void free_environ(char **env);
 char **env_setenv(char **env, const char *name);
+ * A replacement of main() that ensures that argv[0] has a path
+ */
+#define main(c,v) main(int argc, const char **argv) \
+{ \
+	static int mingw_main(); \
+	argv[0] = xstrdup(_pgmptr); \
+	return mingw_main(argc, argv); \
+} \
+static int mingw_main(c,v)