[source] px5g: Fix TARGET_LDFLAGS and add TARGET_CPPFLAGS

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/c6dd059a9a00db37c4d32eae1fe10635706bd8fc

commit c6dd059a9a00db37c4d32eae1fe10635706bd8fc
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Sun Feb 12 14:07:36 2017 -0800

    px5g: Fix TARGET_LDFLAGS and add TARGET_CPPFLAGS
    
    Make sure we pass down TARGET_CPPFLAGS to let toolchains with no default
    search paths to find the mbdetls headers, and override TARGET_LDFLAGS to
    include libraries we are linking against.
    
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
    (cherry picked from commit 306ee6436170d4c3c0c677653e9a20a8ee116cf7)
---
 package/utils/px5g/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/utils/px5g/Makefile b/package/utils/px5g/Makefile
index 6fd73e3..8d1f04d 100644
--- a/package/utils/px5g/Makefile
+++ b/package/utils/px5g/Makefile
@@ -47,7 +47,7 @@ define Build/Prepare
 	mkdir -p $(PKG_BUILD_DIR)
 endef
 
-TARGET_LDFLAGS := -lmbedtls -lmbedx509 -lmbedcrypto
+TARGET_LDFLAGS += -lmbedtls -lmbedx509 -lmbedcrypto
 
 ifeq ($(BUILD_VARIANT),standalone)
   TARGET_LDFLAGS := -Wl,-Bstatic $(TARGET_LDFLAGS) -Wl,-Bdynamic
@@ -56,7 +56,7 @@ endif
 TARGET_CFLAGS += -Wl,--gc-sections
 
 define Build/Compile
-	$(TARGET_CC) $(TARGET_CFLAGS) -o $(PKG_BUILD_DIR)/px5g px5g.c $(TARGET_LDFLAGS)
+	$(TARGET_CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) -o $(PKG_BUILD_DIR)/px5g px5g.c $(TARGET_LDFLAGS)
 endef
 
 define Package/px5g-mbedtls/install