compat: fall back on __va_copy if available

diff --git a/color.h b/color.h
index 03ca0647485e8044d4131f2c61c37b4e9408cd2a..170ff4074d220e7e62264c4c63d1419f4a59d664 100644 (file)
--- a/color.h
+++ b/color.h
@@ -43,6 +43,9 @@
 #define GIT_COLOR_BG_MAGENTA   "\033[45m"
 #define GIT_COLOR_BG_CYAN      "\033[46m"
 
+/* A special value meaning "no color selected" */
+#define GIT_COLOR_NIL "NIL"
+
 /*
  * This variable stores the value of color.ui
  */
@@ -62,4 +65,6 @@ int color_fprintf(FILE *fp, const char *color, const char *fmt, ...);
 __attribute__((format (printf, 3, 4)))
 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...);
 
+int color_is_nil(const char *color);
+
 #endif /* COLOR_H */