Merge branch 'jk/weather-balloon-require-variadic-macro'

We've carried compatibility codepaths for compilers without
variadic macros for quite some time, but the world may be ready for
them to be removed.  Force compilation failure on exotic platforms
where variadic macros are not available to find out who screams in
such a way that we can easily revert if it turns out that the world
is not yet ready.

* jk/weather-balloon-require-variadic-macro:
  git-compat-util: always enable variadic macros

Author: gitster

git-compat-util.h

@@ -1176,9 +1176,12 @@ static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
 #endif
 #endif
 
-#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
+/*
+ * This is always defined as a first step towards making the use of variadic
+ * macros unconditional. If it causes compilation problems on your platform,
+ * please report it to the Git mailing list at [email protected].
+ */
 #define HAVE_VARIADIC_MACROS 1
-#endif
 
 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */
 extern int BUG_exit_code;