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-rw-r--r--Makerules30
1 files changed, 20 insertions, 10 deletions
diff --git a/Makerules b/Makerules
index 3e3dff93b..be87dfb6f 100644
--- a/Makerules
+++ b/Makerules
@@ -5,6 +5,12 @@
.SUFFIXES: .c .S .o .os .oS .so .a .s .i
PHONY := FORCE
+
+.PHONY: dummy $(PHONY) \
+ all check clean realclean distclean test \
+ config dist menuconfig oldconfig release \
+ subdirs utils
+
# order is important, the stripping uses STRIP_FLAGS for lib-so, but not for lib-a
ifeq ($(HAVE_SHARED),y)
.LIBPATTERNS: "lib%.so"
@@ -126,18 +132,28 @@ disp_unifdef = $($(DISP)_disp_unifdef)
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
+# ../foo/bar/baz.ext -> foo_bar_baz.ext
+variablify = $(subst /,_,$(subst $(top_builddir),,$(1)))
+# strip the top_builddir off everything to make the *string* idempotent for -C
+dirify = $(subst $(top_builddir),,$(patsubst -L$(top_builddir)%,-L%,$(patsubst -I$(top_builddir)%,-I%,$(1))))
+
# True if not identical. Neither order nor whitespace nor identical flags
# matter.
-compare_flags = $(strip $(filter-out $(cmd_$(1)), $(cmd_$(@))) \
- $(filter-out $(cmd_$(@)), $(cmd_$(1))))
+compare_flags = \
+ $(strip $(filter-out $(call dirify,$(cmd_$(call variablify,$(1)))), \
+ $(call dirify,$(cmd_$(call variablify,$(@))))) \
+ $(filter-out $(call dirify,$(cmd_$(call variablify,$(@)))), \
+ $(call dirify,$(cmd_$(call variablify,$(1))))))
# Rebuild if any prerequisite, the used CC or flags changed.
# Previously used flags are stored in the corresponding .%.dep files
-maybe_exec = $(if $(strip $(compare_flags) $(any-prereq)), \
+maybe_exec = \
+ $(if $(strip $(compare_flags) $(any-prereq)), \
@set -e; \
$(disp_$(1)); \
$(cmd_$(1)); \
- echo 'cmd_$@ := $(cmd_$1)' >> $(dir $@).$(notdir $@).dep)
+ echo 'cmd_$(call variablify,$@) := $(call dirify,$(cmd_$(call variablify,$1)))' >> $(dir $@).$(notdir $@).dep)
+
CFLAGS_gen.dep = -MT $@ -MD -MP -MF $(dir $@).$(notdir $@).dep
@@ -364,7 +380,6 @@ files.dep := $(libc-a-y) $(libc-so-y) $(libc-nonshared-y) \
.depends.dep := $(foreach f,$(.depends.dep),$(dir $(f)).$(notdir $(f)))
.depends.dep := $(wildcard $(.depends.dep))
-.PHONY: dummy $(PHONY)
FORCE:
clean: objclean-y headers_clean-y
@@ -374,11 +389,6 @@ realclean: clean
objclean-y: $(objclean-y)
headers_clean-y: $(headers_clean-y)
-.PHONY: \
- all check clean realclean distclean test \
- config dist menuconfig oldconfig release \
- subdirs utils
-
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
ifneq ($(strip $(.depends.dep)),)
.NOEXPORT: