espeak: Compile with uClibc++

Several Makefile cleanups.

Added PKG_BUILD_PARALLEL for faster compilation.

Several size optimizations applied.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry-picked from 21e195f657)

sound/espeak/Makefile

@@ -12,20 +12,22 @@ PKG_RELEASE:=2
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-source.zip
 PKG_SOURCE_URL:=@SF/espeak
 PKG_HASH:=bf9a17673adffcc28ff7ea18764f06136547e97bbd9edf2ec612f09b207f0659
-
-PKG_LICENSE:=GPL-3.0
-PKG_LICENSE_FILES:=License.txt
-PKG_MAINTAINER:=Nicolas Thill <nico@openwrt.org>
-
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)-source
-PKG_INSTALL:=1
 
+PKG_MAINTAINER:=
+PKG_LICENSE:=GPL-3.0-or-later
+PKG_LICENSE_FILES:=License.txt
+
+PKG_INSTALL:=1
+PKG_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/uclibc++.mk
 include $(INCLUDE_DIR)/package.mk
 
 define Package/espeak
   SECTION:=sound
   CATEGORY:=Sound
-  DEPENDS:=+libpthread +libstdcpp +portaudio
+  DEPENDS:=$(CXX_DEPENDS) +portaudio
   TITLE:=Speech synthesizer
   URL:=http://espeak.sourceforge.net/
 endef
@@ -35,23 +37,26 @@ define Package/espeak/description
  other languages.
 endef
 
-MAKE_FLAGS+= \
-	AUDIO="portaudio" \
-	DATADIR="/usr/share/espeak" \
-	CXXFLAGS="$(TARGET_CFLAGS)" \
-	LDFLAGS="$(TARGET_LDFLAGS)" \
-
-MAKE_PATH:=./src
-
 # Use system header for portaudio
 define Build/Prepare
 	$(call Build/Prepare/Default)
 	rm $(PKG_BUILD_DIR)/src/portaudio.h
 endef
 
+MAKE_FLAGS+= \
+	AUDIO="portaudio" \
+	DATADIR="/usr/share/espeak" \
+	CXXFLAGS="$(TARGET_CXXFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS)" \
+
+MAKE_PATH:=./src
+
+TARGET_CXXFLAGS += -std=c++14 -ffunction-sections -fdata-sections -flto
+TARGET_LDFLAGS += $(FPIC) $(if $(CONFIG_USE_GLIBC),-lm) -Wl,--gc-sections,--as-needed
+
 define Package/espeak/install
 	$(INSTALL_DIR) $(1)/usr/bin
-	$(CP) $(PKG_INSTALL_DIR)/usr/bin/espeak $(1)/usr/bin/
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/espeak $(1)/usr/bin/
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libespeak.so.* $(1)/usr/lib/
 	$(INSTALL_DIR) $(1)/usr/share

sound/espeak/patches/010-uclibcxx.patch

@@ -0,0 +1,21 @@
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -83,15 +83,15 @@ libespeak_SOURCES = speak_lib.cpp compiledict.cpp dictionary.cpp intonation.cpp
+ 
+ SRCS1=$(speak_SOURCES)
+ OBJS1=$(patsubst %.cpp,%.o,$(SRCS1))
+-LIBS1=-lstdc++ $(LIB_AUDIO) -lpthread $(EXTRA_LIBS)
++LIBS1=$(LIB_AUDIO) -lpthread $(EXTRA_LIBS)
+ 
+ SRCS2=$(libespeak_SOURCES)
+ OBJS2=$(patsubst %.cpp,x_%.o,$(SRCS2))
+-LIBS2=-lstdc++ $(LIB_AUDIO) -lpthread
++LIBS2=$(LIB_AUDIO) -lpthread
+ 
+ SRCS3 = espeak.cpp
+ OBJS3=$(patsubst %.cpp,%.o,$(SRCS3))
+-LIBS3=-lstdc++ -L . -lespeak
++LIBS3=-L . -lespeak
+ 
+ CXXFLAGS=-O2
+