Use nifty gcc -MD feature to automatically track .h dependencies of all C

files, this finally gives proper dependencies, which means the end of
getting broken binaries around headerfile changes, etc.

Sure, this may not work on obscurux with superawesomeincompatiblecc while
autoconf does, but at least BitlBee's configure script still runs in <1s.
:-)

1 files changed, 8 insertions, 0 deletions

diff --git a/configure b/configure
index 9b77604c..c0d79bdd 100755
--- a/configure
+++ b/configure
@@ -570,6 +570,14 @@ EOF
 	fi
 fi
 
+case "$CC" in
+*gcc* )
+	echo CFLAGS+=-MD -MF .depend/\$@.d >> Makefile.settings
+	for i in . lib protocols protocols/*/; do
+		mkdir -p $i/.depend
+	done
+esac
+
 if [ "$msn" = 0 ]; then
 	echo '#undef WITH_MSN' >> config.h
 else