From 8ce1f243e5456eab52486b955389be2521dfcca5 Mon Sep 17 00:00:00 2001
From: Michal Rokos <michal.rokos@nextsoft.cz>
Date: Tue, 11 Mar 2008 09:48:34 +0100
Subject: [PATCH] autoconf: Test FREAD_READS_DIRECTORIES
Add test for FREAD_READS_DIRECTORIES to detect when fread() reads fopen'ed
directory.
Tested on these platforms:
AIX 5.3 - FREAD_READS_DIRECTORIES=UnfortunatelyYes
HP-UX B.11.11 - FREAD_READS_DIRECTORIES=UnfortunatelyYes
HP-UX B.11.23 - FREAD_READS_DIRECTORIES=UnfortunatelyYes
Linux 2.6.25-rc4 - FREAD_READS_DIRECTORIES=
Tru64 V5.1 - FREAD_READS_DIRECTORIES=UnfortunatelyYes
Windows - FREAD_READS_DIRECTORIES=
Signed-off-by: Michal Rokos <michal.rokos@nextsoft.cz>
Tested-by: Mike Ralphson <mike@abacus.co.uk>
Tested-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
config.mak.in | 1 +
configure.ac | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/config.mak.in b/config.mak.in
index 8e1cd5f03d..7868dfd93a 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -46,4 +46,5 @@ NO_MKDTEMP=@NO_MKDTEMP@
NO_ICONV=@NO_ICONV@
OLD_ICONV=@OLD_ICONV@
NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@
+FREAD_READS_DIRECTORIES=@FREAD_READS_DIRECTORIES@
SNPRINTF_RETURNS_BOGUS=@SNPRINTF_RETURNS_BOGUS@
diff --git a/configure.ac b/configure.ac
index 287149d304..82584e9153 100644
--- a/configure.ac
+++ b/configure.ac
@@ -327,6 +327,26 @@ else
fi
AC_SUBST(NO_C99_FORMAT)
#
+# Define FREAD_READS_DIRECTORIES if your are on a system which succeeds
+# when attempting to read from an fopen'ed directory.
+AC_CACHE_CHECK([whether system succeeds to read fopen'ed directory],
+ [ac_cv_fread_reads_directories],
+[
+AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+ [[char c;
+ FILE *f = fopen(".", "r");
+ return f && fread(&c, 1, 1, f)]])],
+ [ac_cv_fread_reads_directories=no],
+ [ac_cv_fread_reads_directories=yes])
+])
+if test $ac_cv_fread_reads_directories = yes; then
+ FREAD_READS_DIRECTORIES=UnfortunatelyYes
+else
+ FREAD_READS_DIRECTORIES=
+fi
+AC_SUBST(FREAD_READS_DIRECTORIES)
+#
# Define SNPRINTF_RETURNS_BOGUS if your are on a system which snprintf()
# or vsnprintf() return -1 instead of number of characters which would
# have been written to the final string if enough space had been available.