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Adjust dependency rules to permit per-file flags

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The dependency rules are currently done in a shell 'for' loop. This does not
permit Makefile variables to adjust preprocessor flags as is done with normal
compile flags, using the CFLAGS_path/file.o syntax.

This change moves the dependency generation into the Makefile itself, and
permits a CPPFLAGS_path/file.o to adjust preprocessor flags on a file or
directory basis.

The CPPFLAGS_... variable is also folded into CFLAGS during the build.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2011-10-07 13:53:49 +00:00 committed by Wolfgang Denk
parent 925493582c
commit 4750884306
4 changed files with 42 additions and 13 deletions
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2
.gitignore vendored
View file

@ -40,7 +40,7 @@
# Generated files
#
*.depend
*.depend*
/LOG
/errlog
/reloc_off

2
Makefile
View file

@ -955,7 +955,7 @@ clean:
| xargs rm -f
clobber: clean
@find $(OBJTREE) -type f \( -name '*.depend' \
@find $(OBJTREE) -type f \( -name '*.depend*' \
-o -name '*.srec' -o -name '*.bin' -o -name u-boot.img \) \
-print0 \
| xargs -0 rm -f

7
config.mk
View file

@ -277,6 +277,13 @@ export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS
BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
ALL_CFLAGS += $(EXTRA_CPPFLAGS)
# The _DEP version uses the $< file target (for dependency generation)
# See rules.mk
EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
$(CPPFLAGS_$(BCURDIR))
$(obj)%.s: %.S
$(CPP) $(ALL_AFLAGS) -o $@ $<
$(obj)%.o: %.S

44
rules.mk
View file

@ -25,17 +25,39 @@
_depend: $(obj).depend
$(obj).depend: $(src)Makefile $(TOPDIR)/config.mk $(SRCS) $(HOSTSRCS)
@rm -f $@
@touch $@
@for f in $(SRCS); do \
g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
$(CC) -M $(CPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
done
@for f in $(HOSTSRCS); do \
g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
$(HOSTCC) -M $(HOSTCPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
done
# Split the source files into two camps: those in the current directory, and
# those somewhere else. For the first camp we want to support CPPFLAGS_<fname>
# and for the second we don't / can't.
PWD_SRCS := $(filter $(notdir $(SRCS)),$(SRCS))
OTHER_SRCS := $(filter-out $(notdir $(SRCS)),$(SRCS))
# This is a list of dependency files to generate
DEPS := $(basename $(patsubst %,$(obj).depend.%,$(PWD_SRCS)))
# Join all the dependencies into a single file, in three parts
# 1 .Concatenate all the generated depend files together
# 2. Add in the deps from OTHER_SRCS which we couldn't process
# 3. Add in the HOSTSRCS
$(obj).depend: $(src)Makefile $(TOPDIR)/config.mk $(DEPS) $(HOSTSRCS)
cat /dev/null $(DEPS) >$@
@for f in $(OTHER_SRCS); do \
g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
$(CC) -M $(CPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
done
@for f in $(HOSTSRCS); do \
g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
$(HOSTCC) -M $(HOSTCPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
done
MAKE_DEPEND = $(CC) -M $(CPPFLAGS) $(EXTRA_CPPFLAGS_DEP) \
-MQ $(addsuffix .o,$(obj)$(basename $<)) $< >$@
$(obj).depend.%: %.c
$(MAKE_DEPEND)
$(obj).depend.%: %.S
$(MAKE_DEPEND)
$(HOSTOBJS): $(obj)%.o: %.c
$(HOSTCC) $(HOSTCFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $< -c