From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Thu, 5 May 2011 20:37:21 +0000 (+0200)
Subject: mesa: don't touch git_sha1.h if sha1 didn't change
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=02a6c9428d2ebb0ba121533f6bd7a0f2fe58c615;p=mesa.git

mesa: don't touch git_sha1.h if sha1 didn't change

Reviewed-by: Dan Nicholson <dbn.lists@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---

diff --git a/bin/extract_git_sha1 b/bin/extract_git_sha1
index e6e6731a36c..5e635d4b74d 100755
--- a/bin/extract_git_sha1
+++ b/bin/extract_git_sha1
@@ -1,10 +1,16 @@
 #!/bin/sh
-touch src/mesa/main/git_sha1.h
+if [ ! -f src/mesa/main/git_sha1.h ]; then
+	touch src/mesa/main/git_sha1.h
+fi
+
 if which git > /dev/null; then
     # Extract the 7-digit "short" SHA1 for the current HEAD, convert
     # it to a string, and wrap it in a #define.  This is used in
     # src/mesa/main/version.c to put the GIT SHA1 in the GL_VERSION string.
     git log -n 1 --oneline |\
 	sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
-	> src/mesa/main/git_sha1.h
+	> src/mesa/main/git_sha1.h.tmp
+    if ! cmp -s src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h; then
+    	mv src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h
+    fi
 fi
diff --git a/src/mesa/main/.gitignore b/src/mesa/main/.gitignore
index e48030ecf7a..2575f44df4a 100644
--- a/src/mesa/main/.gitignore
+++ b/src/mesa/main/.gitignore
@@ -3,3 +3,4 @@ api_exec_es2.c
 get_es1.c
 get_es2.c
 git_sha1.h
+git_sha1.h.tmp