Use frameworks for libpng and Vorbis if requested and available

sc2/build/unix/build.config

@@ -262,12 +262,10 @@ uqm_prepare_config()
 	CHOICE_ovcodec_TITLE="Ogg Vorbis codec"
 	CHOICE_ovcodec_OPTION_standard_TITLE="Xiph libogg + libvorbis"
 	CHOICE_ovcodec_OPTION_standard_PRECOND="have_library vorbisfile"
-#	CHOICE_ovcodec_OPTION_standard_PRECOND="have_library vorbisfile && have_library vorbis"
 	CHOICE_ovcodec_OPTION_standard_ACTION=ovcodec_standard_action
 	ovcodec_standard_action() {
 		use_library vorbisfile
 		OGGVORBIS=vorbisfile
-#		use_library vorbis
 	}
 	CHOICE_ovcodec_OPTION_tremor_TITLE="Tremor (avoids floating point math)"
 	CHOICE_ovcodec_OPTION_tremor_PRECOND="have_library tremor"

sc2/build/unix/config_functions

@@ -608,11 +608,13 @@ use_library() {
 #              If not, do nothing. Do not even mark it as not found; it might
 #              be available by some other means.
 #              This function is currently specific to macOS builds.
-# Arguments:   $1        - framework to check.
+# Arguments:   $1        - The name of the library as used in config_proginfo
+#              $2        - (optional, default $1) the name of the framework
 #              DEPS_PATH - environment variable that if set specifies where to
 #                          check for the framework.
+# Pre:         LIB_${1}_NAME is expected to exist.
 have_framework() {
-	local TEMP_LIBNAME
+	local TEMP_LIBNAME LIB LIBVAR FRAMEWORK_PATH
 	# If we aren't on a Mac, there is no framework
 	if [[ "x$HOST_SYSTEM" != "xDarwin" ]]; then
 		return 1
@@ -621,15 +623,21 @@ have_framework() {
 	if [[ -z "$DEPS_PATH" ]]; then
 		return 1
 	fi
-	TEMP_LIBNAME="${DEPS_PATH}/${1}.framework"
-	if [[ -d "$TEMP_LIBNAME" ]]; then
-		build_message "${1} found in ${DEPS_PATH}."
-		setVar "LIB_${1}_PRESENT" 0
-		setVar LIB_$1_CFLAGS "-I${TEMP_LIBNAME}/Headers"
-		setVar LIB_$1_LDFLAGS "-F${DEPS_PATH} -framework ${1}"
+	LIBVAR=$1
+	LIB=$2
+	if [[ -z "$2" ]]; then
+		LIB=$LIBVAR
+	fi
+	TEMP_LIBNAME=`evalVar "LIB_${LIBVAR}_NAME"`
+	FRAMEWORK_PATH="${DEPS_PATH}/${LIB}.framework"
+	if [[ -d "$FRAMEWORK_PATH" ]]; then
+		build_message "${TEMP_LIBNAME} found in ${DEPS_PATH}."
+		setVar "LIB_${LIBVAR}_PRESENT" 0
+		setVar "LIB_${LIBVAR}_CFLAGS" "-F${DEPS_PATH} -I${FRAMEWORK_PATH}/Headers"
+		setVar "LIB_${LIBVAR}_LDFLAGS" "-F${DEPS_PATH} -framework ${LIB}"
 		return 0
 	fi
-	build_message "${1} not found in ${DEPS_PATH}."
+	build_message "${TEMP_LIBNAME} not found in ${DEPS_PATH}."
 	return 1
 }
 

sc2/build/unix/config_proginfo_host

@@ -116,8 +116,18 @@ LIB_libpng_NAME="libpng"
 #
 # To link against a static libpng, set LDFLAGS with an appropriate -L
 # argument before calling `build.sh uqm config`.
+case "$HOST_SYSTEM" in
+	Darwin)
+		if not have_framework libpng; then
 			LIB_libpng_CFLAGS=""
 			LIB_libpng_LDFLAGS="-lpng"
+		fi
+		;;
+	*)
+		LIB_libpng_CFLAGS=""
+		LIB_libpng_LDFLAGS="-lpng"
+	;;
+esac
 
 
 ### OpenAL ###
@@ -176,18 +186,6 @@ esac
 LIB_opengl_VERSION=""
 
 
-### Vorbis ###
-LIB_vorbis_NAME="libvorbis"
-LIB_vorbis_CFLAGS=""
-LIB_vorbis_LDFLAGS="-lvorbis"
-LIB_vorbis_VERSION=""
-case "$HOST_SYSTEM" in
-	ARMV5|WINSCW|GCCE)
-		LIB_vorbis_DETECT="false"
-		;;
-esac
-
-
 ### Vorbisfile ###
 LIB_vorbisfile_NAME="vorbisfile"
 case "$HOST_SYSTEM" in
@@ -200,8 +198,10 @@ case "$HOST_SYSTEM" in
 		LIB_vorbisfile_LDFLAGS="-lvorbisfile -lvorbis -lm -logg"
 		;;
 	Darwin)
+		if not have_framework vorbisfile Vorbis; then
 			LIB_vorbisfile_CFLAGS="-D__MACOSX__"
 			LIB_vorbisfile_LDFLAGS="-lvorbisfile -lvorbis"
+		fi
 		;;
 	QNX)
 		LIB_vorbisfile_CFLAGS=""
@@ -235,9 +235,11 @@ case "$HOST_SYSTEM" in
 		LIB_tremor_LDFLAGS="-L/usr/local/lib -lvorbisidec"
 		;;
 	Darwin)
+		if not have_framework tremor Tremor; then
 			# Assumed values - please let me know if you can verify this.
 			LIB_tremor_CFLAGS=""
 			LIB_tremor_LDFLAGS="-framework Tremor"
+		fi
 		;;		
 	ARMV5|WINSCW|GCCE)
 		LIB_tremor_DETECT="true"