From aef6bd1bdd532dfdc8ecb45a012205953dbb13a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5ns=20Rullg=C3=A5rd?= <mans@mansr.com>
Date: Mon, 10 Aug 2009 17:25:46 +0000
Subject: [PATCH] Fix dependency generation with ccache/gcc

When running behind ccache, the output from -MMD is corrupted unless
we also use the -MF and -MT flags.

Since ccache is difficult to detect and gcc 2.x doesn't support the
-MF and -MT flags, we always use the old dependency generation method
when gcc 2.x is detected.

Originally committed as revision 19620 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 configure | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 865b590847..0832edd424 100755
--- a/configure
+++ b/configure
@@ -1510,8 +1510,10 @@ filter_asflags=echo
 
 if   $cc -v 2>&1 | grep -qi ^gcc; then
     cc_type=gcc
-    CC_DEPFLAGS='-MMD'
-    AS_DEPFLAGS='-MMD'
+    if ! $cc -dumpversion | grep -q '^2\.'; then
+        CC_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
+        AS_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
+    fi
 elif $cc --version 2>/dev/null | grep -q Intel; then
     cc_type=icc
     CC_DEPFLAGS='-MMD'