compat/fopen.c: avoid clobbering the system defined fopen macro

Some systems define fopen as a macro based on compiler settings.
The previous technique for reverting to the system fopen function
by merely undefining fopen is inadequate in this case. Instead,
avoid defining fopen entirely when compiling this source file.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Tested-by: Mike Ralphson <mike@abacus.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/fopen.c b/compat/fopen.c
index ccb9e89fa46144744fa530930d8db7644ab2da74..b5ca142fedf2ac0e0cedde1011ab385f65010fdf 100644 (file)
--- a/compat/fopen.c
+++ b/compat/fopen.c
@@ -1,5 +1,16 @@
+/*
+ *  The order of the following two lines is important.
+ *
+ *  FREAD_READS_DIRECTORIES is undefined before including git-compat-util.h
+ *  to avoid the redefinition of fopen within git-compat-util.h. This is
+ *  necessary since fopen is a macro on some platforms which may be set
+ *  based on compiler options. For example, on AIX fopen is set to fopen64
+ *  when _LARGE_FILES is defined. The previous technique of merely undefining
+ *  fopen after including git-compat-util.h is inadequate in this case.
+ */
+#undef FREAD_READS_DIRECTORIES
 #include "../git-compat-util.h"
-#undef fopen
+
 FILE *git_fopen(const char *path, const char *mode)
 {
        FILE *fp;