commit-graph: allow cross-alternate chains

diff --git a/git-compat-util.h b/git-compat-util.h
index 29a19902aaa00b90176e253c90c2384fca65857c..6573808ebd991b52eca7cc644af4c9611b9c3747 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1234,6 +1234,14 @@ struct tm *git_gmtime_r(const time_t *, struct tm *);
 #define getc_unlocked(fh) getc(fh)
 #endif
 
+#ifdef FILENO_IS_A_MACRO
+int git_fileno(FILE *stream);
+# ifndef COMPAT_CODE
+#  undef fileno
+#  define fileno(p) git_fileno(p)
+# endif
+#endif
+
 /*
  * Our code often opens a path to an optional file, to work on its
  * contents when we can successfully open it.  We can ignore a failure