In a project, I am preprocessing the C++ source and headers. That is:
foo.ccg -> foo.cc
foo.hg -> foo.h
Some custom m4 I wrote processes the files with some simple rules:
$(top_builddir)/build/classgen.m4f: $(top_srcdir)/build/classgen.m4
$(M4) -P -F $@ $^
%.cc: %.ccg $(top_builddir)/build/classgen.m4f
$(M4) -P -R $(top_builddir)/build/classgen.m4f $< > $@
%.h: %.hg $(top_builddir)/build/classgen.m4f
$(M4) -P -R $(top_builddir)/build/classgen.m4f $< > $@
Now the complex part ;-)
If I have, in my Makefile.am:
lib_LTLIBRARIES = libfoo.la
libfoo_la_pre_sources = \
foo.ccg \
foo.hg \
libfoo_la_post_sources = \
$(addsuffix .cc,$(basename $(filter %.ccg,$(libfoo_la_pre_sources)))) \
$(addsuffix .h,$(basename $(filter %.hg,$(libfoo_la_pre_sources))))
libfoo_la_SOURCES = \
$(libfoo_la_pre_sources) \
$(libfoo_la_post_sources) \
bar.cc \
bar.h \
If I touch foo.ccg, foo.cc is regenerated and foo.lo rebuilt.
However, if I touch foo.hg, foo.h is not rebuilt, which is causing
problems (I need to do a manual "make foo.h" every time I alter
foo.hg). How should I make this automatic? I thought the above rules
would be sufficient, but it does not appear so.
Many thanks,
Roger
--
Roger Leigh
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