build: use CXXFLAGS if defined

Instead of using TARGET_CFLAGS and EXTRA_CFLAGS in cmake and scons
build use the TARGET_CXXFLAGS and EXTRA_CXXFLAGS like it is done for
normal make and configure. configure used TARGET_CXXFLAGS and
EXTRA_CFLAGS for the CXXFLAGS. The package-default.mk sets
"EXTRA_CXXFLAGS = $(EXTRA_CFLAGS)" so using EXTRA_CXXFLAGS flags should
be save.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

include/cmake.mk

@@ -41,7 +41,7 @@ define Build/Configure/Default
 	mkdir -p $(CMAKE_BINARY_DIR)
 	(cd $(CMAKE_BINARY_DIR); \
 		CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
-		CXXFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
+		CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS)" \
 		LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)" \
 		cmake \
 			-DCMAKE_SYSTEM_NAME=Linux \

include/package-defaults.mk

@@ -97,7 +97,7 @@ CONFIGURE_ARGS = \
 CONFIGURE_VARS = \
 		$(TARGET_CONFIGURE_OPTS) \
 		CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
-		CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CFLAGS)" \
+		CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS)" \
 		CPPFLAGS="$(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
 		LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)" \
 

include/scons.mk

@@ -4,7 +4,7 @@ SCONS_VARS = \
 	CC="$(TARGET_CC_NOCACHE)" \
 	CXX="$(TARGET_CXX_NOCACHE)" \
 	CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
-	CXXFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
+	CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS)" \
 	CPPFLAGS="$(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
 	LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)" \
 	DESTDIR="$(PKG_INSTALL_DIR)"