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 <s...@chromium.org>
---
Changes in v3:
- Change U-Boot's dependency generation to permit per-file flags
.gitignore | 2 +-
config.mk | 7 +++++++
rules.mk | 23 ++++++++++++-----------
3 files changed, 20 insertions(+), 12 deletions(-)
diff --git a/.gitignore b/.gitignore
index dbf545f..7ba0dd9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,7 +39,7 @@
# Generated files
#
-*.depend
+*.depend*
/LOG
/errlog
/reloc_off
diff --git a/config.mk b/config.mk
index e2b440d..3fa9eef 100644
--- a/config.mk
+++ b/config.mk
@@ -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
diff --git a/rules.mk b/rules.mk
index d79fcd3..56b9044 100644
--- a/rules.mk
+++ b/rules.mk
@@ -25,17 +25,18 @@
_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
+DEPS := $(basename $(patsubst %,$(obj).depend.%,$(SRCS)))
+
+$(obj).depend: $(src)Makefile $(TOPDIR)/config.mk $(DEPS) $(HOSTSRCS)
+ cat /dev/null $(DEPS) >$@
+ @for f in $(HOSTSRCS); do \
+ g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
+ $(HOSTCC) -M $(HOSTCPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
+ done
+
+$(obj).depend.%: %.c
+ $(CC) -M $(CPPFLAGS) $(EXTRA_CPPFLAGS_DEP) \
+ -MQ $(addsuffix .o,$(basename $<)) $< >$@
$(HOSTOBJS): $(obj)%.o: %.c
$(HOSTCC) $(HOSTCFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o
$@ $< -c
--
1.7.3.1
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