xbps-src: added XBPS_LDFLAGS into the configuration file.

This is to specify common LDFLAGS settings for all packages, by default
it's set to '-Wl,--as-needed' to avoid linking extra libraries into
the binaries. This helped to find such cases.

xbps-src/etc/xbps-src.conf

@@ -19,6 +19,15 @@ XBPS_MASTERDIR=$XBPS_DISTRIBUTIONDIR/masterdir
 XBPS_CFLAGS="-O2 -pipe"
 XBPS_CXXFLAGS="$XBPS_CFLAGS"
 
+#
+# Linker flags passed to the compiler. By default we use --as-needed to
+# avoid linking extra libraries into binaries. See the following link
+# for info:
+#
+# http://www.gentoo.org/proj/en/qa/asneeded.xml
+#
+XBPS_LDFLAGS="-Wl,--as-needed"
+
 #
 # Number of jobs when running make(1)-alike commands.
 #

xbps-src/shutils/build_funcs.sh

@@ -30,6 +30,7 @@
 build_src_phase()
 {
 	local pkg="$pkgname-$version" pkgparam="$1" f lver
+	local mkldflags
 
 	[ -z $pkgparam ] && [ -z $pkgname -o -z $version ] && return 1
 
@@ -57,7 +58,7 @@ build_src_phase()
 		make_cmd="python"
 		make_build_args="setup.py build"
 	else
-		[ -z "$make_cmd" ] && make_cmd=/usr/bin/make
+		[ -z "$make_cmd" ] && make_cmd=make
 		[ -n "$XBPS_MAKEJOBS" -a -z "$disable_parallel_build" ] && \
 			makejobs="-j$XBPS_MAKEJOBS"
 	fi
@@ -77,6 +78,7 @@ build_src_phase()
 	msg_normal "Package '$pkgname ($lver)': running build phase."
 
 	if [ "$build_style" = "custom-install" ]; then
+		[ -n "$XBPS_LDFLAGS" ] && export LDFLAGS="$XBPS_LDFLAGS"
 		run_func do_build 2>${wrksrc}/.xbps_do_build.log
 		if [ $? -ne 0 -a $? -ne 255 ]; then
 			msg_error "Package '$pkgname': do_build phase failed!"
@@ -85,7 +87,12 @@ build_src_phase()
 		#
 		# Build package via make.
 		#
-		${make_cmd} ${makejobs} ${make_build_args} \
+		if [ "$build_style" = "gnu_makefile" ]; then
+			if [ -n "$XBPS_LDFLAGS" ]; then
+				mkldfags="$LDFLAGS $XBPS_LDFLAGS"
+			fi
+		fi
+		env LDFLAGS="$mkldflags" ${make_cmd} ${makejobs} ${make_build_args} \
 			${make_build_target} ||
 			msg_error "Package '$pkgname': build phase failed!"
 	fi

xbps-src/shutils/chroot.sh.in

@@ -61,6 +61,7 @@ XBPS_DISTRIBUTIONDIR=/xbps
 XBPS_MASTERDIR=/
 XBPS_CFLAGS="$XBPS_CFLAGS"
 XBPS_CXXFLAGS="$XBPS_CFLAGS"
+XBPS_LDFLAGS="$XBPS_LDFLAGS"
 XBPS_FETCH_CMD="xbps-uhelper.static fetch"
 XBPS_COMPRESS_CMD="$XBPS_COMPRESS_CMD"
 _EOF

xbps-src/shutils/configure_funcs.sh

@@ -30,6 +30,7 @@
 configure_src_phase()
 {
 	local f lver error=0
+	local conf_ldflags
 
 	[ -z $pkgname ] && return 1
 
@@ -84,12 +85,17 @@ configure_src_phase()
 		cd $build_wrksrc || return 1
 	fi
 
+	if [ -n "$XBPS_LDFLAGS" ]; then
+		conf_ldflags="$XBPS_LDFLAGS"
+	fi
+
 	case "$build_style" in
 	gnu_configure|gnu-configure)
 		#
 		# Packages using GNU autoconf
 		#
-		${configure_script} --prefix=/usr --sysconfdir=/etc \
+		env LDFLAGS="$LDFLAGS $conf_ldflags" \
+			${configure_script} --prefix=/usr --sysconfdir=/etc \
 			--infodir=/usr/share/info --mandir=/usr/share/man \
 			${configure_args} || error=$?
 		;;
@@ -97,7 +103,8 @@ configure_src_phase()
 		#
 		# Packages using custom configure scripts.
 		#
-		${configure_script} ${configure_args} || error=$?
+		env LDFLAGS="$LDFLAGS $conf_ldflags" ${configure_script} \
+			${configure_args} || error=$?
 		;;
 	perl-module|perl_module)
 		#

xbps-src/shutils/tmpl_funcs.sh.in

@@ -265,9 +265,9 @@ set_tmpl_common_vars()
 
 	export CFLAGS="$XBPS_CFLAGS"
 	export CXXFLAGS="$XBPS_CXXFLAGS"
-	export CPPFLAGS="-I$XBPS_MASTERDIR/usr/include"
 
 	if [ -z "$in_chroot" ]; then
+		export CPPFLAGS="-I$XBPS_MASTERDIR/usr/include"
 		if [ -d /usr/lib/libfakeroot ]; then
 			LDLIBPATH="/usr/lib/libfakeroot:$XBPS_MASTERDIR/usr/lib"
 		else