Some external toolchaind don't automatically search for headers in
$(STAGING_DIR), make sure we do pass TARGET_CPPFLAGS as appropriate.
This fixes build errors such as:
mipsel-linux-gnu-gcc -O2 -Wall -Wextra -DLUA_COMPAT_5_2 -DLUA_USE_LINUX
-c -o lua.o lua.c
lua.c:80:31: fatal error: readline/readline.h: No such file or directory
#include <readline/readline.h>
^
compilation terminated.
<builtin>: recipe for target 'lua.o' failed
make[6]: *** [lua.o] Error 1
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
$(MAKE) TARGET=$(LINUX_TARGET) -C $(PKG_BUILD_DIR)/lua \
INSTALL_TOP="$(STAGING_DIR)/lua-5.3.3/" \
CC="$(TARGET_CC)" \
+ CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
LDFLAGS="$(TARGET_LDFLAGS) -lncurses -lreadline" \
LD="$(TARGET_LD)" \
linux install