git-compat-util: add a test balloon for C99 support

[thirdparty/git.git] / git-compat-util.h

diff --git a/git-compat-util.h b/git-compat-util.h
index b46605300abf818d27bc04f8d0a727bc6a272330..19943e214ba7689b27aa2a0046c8b7d41b76167e 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1,6 +1,19 @@
 #ifndef GIT_COMPAT_UTIL_H
 #define GIT_COMPAT_UTIL_H
 
+#if __STDC_VERSION__ - 0 < 199901L
+/*
+ * Git is in a testing period for mandatory C99 support in the compiler.  If
+ * your compiler is reasonably recent, you can try to enable C99 support (or,
+ * for MSVC, C11 support).  If you encounter a problem and can't enable C99
+ * support with your compiler (such as with "-std=gnu99") and don't have access
+ * to one with this support, such as GCC or Clang, you can remove this #if
+ * directive, but please report the details of your system to
+ * git@vger.kernel.org.
+ */
+#error "Required C99 support is in a test phase.  Please see git-compat-util.h for more details."
+#endif
+
 #ifdef USE_MSVC_CRTDBG
 /*
  * For these to work they must appear very early in each