Files like lib/.debug/libgcc_s.so.1 from nativesdk-libgcc-dbg contains
buildpath without -fdebug-prefix-map, the root cause is object files (.o)
contain buildpath, and then ccache can't use them correctly.
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
export TARGET_CPPFLAGS = ""
export BUILD_CFLAGS = "${BUILD_CPPFLAGS} ${BUILD_OPTIMIZATION}"
-BUILDSDK_CFLAGS = "${BUILDSDK_CPPFLAGS} ${BUILD_OPTIMIZATION}"
+BUILDSDK_CFLAGS = "${BUILDSDK_CPPFLAGS} ${BUILD_OPTIMIZATION} ${DEBUG_PREFIX_MAP}"
export CFLAGS = "${TARGET_CFLAGS}"
export TARGET_CFLAGS = "${TARGET_CPPFLAGS} ${SELECTED_OPTIMIZATION}"