libspdm: Fixup the build flags

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/libspdm/libspdm_3.6.0.bb

@@ -17,7 +17,7 @@ S = "${WORKDIR}/git"
 inherit cmake
 
 LIBSPDM_CFLAGS = "\
-	${TARGET_CFLAGS} \
+	${OECMAKE_C_FLAGS} \
 	-DLIBSPDM_ENABLE_CAPABILITY_EVENT_CAP=0 \
 	-DLIBSPDM_ENABLE_CAPABILITY_MEL_CAP=0 \
 	-DLIBSPDM_ENABLE_CAPABILITY_GET_KEY_PAIR_INFO_CAP=0 \
@@ -25,6 +25,8 @@ LIBSPDM_CFLAGS = "\
 	-DLIBSPDM_HAL_PASS_SPDM_CONTEXT=1 \
 	"
 
+LIBSPDM_CFLAGS:append:toolchain-gcc = " -fPIE"
+
 def get_spdm_multiarch(bb, d):
     target_arch = d.getVar('TARGET_ARCH')
     multiarch_options = {
@@ -52,6 +54,7 @@ EXTRA_OECMAKE += "\
 	-DCOMPILED_LIBSSL_PATH=${libdir} \
 	-DDISABLE_TESTS=1 \
 	-DDISABLE_EDDSA=1 \
+	-DCMAKE_C_FLAGS='${LIBSPDM_CFLAGS}' \
 	"
 
 do_install () {