# In theory, we do not care -m32 or -m64 for header compile tests.
# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
-UAPI_CFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
+UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
+
+# USERCFLAGS might contain sysroot location for CC.
+UAPI_CFLAGS += $(USERCFLAGS)
override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include
# asm-generic/*.h is used by asm/*.h, and should not be included directly
no-header-test += asm-generic/%
-extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
+always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
# Include the header twice to detect missing include guard.
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
- $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
+ $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
$(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
touch $@