Improved cross compiler support.

* Added a configure option for sysroot.
* Prevent pkgconfig environment variables to be clobbered.
* Prevent PATH environment variable pollution.
* Backward compatible.

Signed-off-by: Guillermo A. Amaral <g@maral.me>

1 files changed, 27 insertions, 4 deletions

diff --git a/configure b/configure
index 921c9b49..5a0527df 100755
--- a/configure
+++ b/configure
@@ -22,6 +22,7 @@ pidfile='/var/run/bitlbee.pid'
 ipcsocket=''
 pcdir='$prefix/lib/pkgconfig'
 systemlibdirs="/lib64 /usr/lib64 /usr/local/lib64 /lib /usr/lib /usr/local/lib"
+sysroot=''
 
 # Set these to default-on to let it be overriden by either the user or purple
 #
@@ -148,6 +149,7 @@ Option		Description				Default
 
 
 --target=...	Cross compilation target 		same as host
+--sysroot=...	Cross compilation sysroot 		$sysroot
 EOF
 		exit;
 	fi
@@ -239,12 +241,33 @@ EOF
 
 
 if [ -n "$target" ]; then
-	PKG_CONFIG_LIBDIR=/usr/$target/lib/pkgconfig
-	export PKG_CONFIG_LIBDIR
-	PATH=/usr/$target/bin:$PATH
+	# prepend sysroot to system lib dirs
+
+	systemlibdirs_cross=''
+	for i in $systemlibdirs; do
+		systemlibdirs_cross="$systemlibdirs_cross $sysroot$i"
+	done
+	systemlibdirs=$systemlibdirs_cross
+	unset systemlibdirs_cross
+
+	# backward compatibility
+
+	if [ -z "$PKG_CONFIG_LIBDIR" ]; then
+		PKG_CONFIG_LIBDIR=/usr/$target/lib/pkgconfig
+		export PKG_CONFIG_LIBDIR
+	fi
+
+	if [ -d /usr/$target/bin ]; then
+		PATH=/usr/$target/bin:$PATH
+	fi
+
+	if [ -d /usr/$target/lib ]; then
+		systemlibdirs="$systemlibdirs /usr/$target/lib"
+	fi
+
 	CC=$target-cc
 	LD=$target-ld
-	systemlibdirs="/usr/$target/lib"
+	STRIP=$target-strip
 fi
 
 if [ "$asan" = "1" ]; then