[PATCH 1/4] autoconf: Check for working mmap

From: Jakub Narebski <jnareb@gmail.com>
Date: Aug 4, 2006, 15:55 UTC
Message-ID: <11547069592652-git-send-email-jnareb@gmail.com>
In-Reply-To: <7v7j1on71n.fsf@assigned-by-dhcp.cox.net>

Use AC_FUNC_MMAP check to check if the `mmap' function exists and works correctly. (It only checks private fixed mapping of already-mapped memory.)

Attention: uses implementation detail of AC_FUNC_MMAP!

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 0a54b44..178220f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -208,6 +208,10 @@ AC_CHECK_FUNC(setenv,[],
 [GIT_CONF_APPEND_LINE(NO_SETENV=YesPlease)])
 #
 # Define NO_MMAP if you want to avoid mmap.
+AC_FUNC_MMAP
+if test $ac_cv_func_mmap_fixed_mapped != yes; then
+	GIT_CONF_APPEND_LINE(NO_MMAP=YesPlease)
+fi
 #
 # Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
 #

-- 
1.4.1.1