On 18/12/09 14:04, David Aldrich wrote:
Hi Maxim and Bart
Thanks very much for reviewing my makefile. Your suggestion of an extra command
did indeed solve my problem. That's great.
Pleasure.
My reason for not replying sooner is that I am testing other parts of the
makefile.
What I sent was actually a simplified version. The real version had:
.PHONY : release
release : $(OBJDIR_R)/$(EXEFILE)
<snip>
$(OBJDIR_R)/$(EXEFILE) : $(ARCHIVES_R)
$(CXX) -o $(OBJDIR_R)/$(EXEFILE) -ldl
-Wl,-whole-archive,-export-dynamic $(ARCHIVES_R) $(EXTRA_LIBS_R)
<snip>
$(ARCHIVES_R) $(ARCHIVES_D) : versioninfo $(STATIC_LIBS) $(DYNAMIC_LIBS)
Now $(ARCHIVES_R) contains the paths of the static libraries. I can see
no reason why this should depend on $(DYNAMIC_LIBS) (some code of the
program is linked in dynamic libraries so that we can selectively load it).
So I think better rules would be:
.PHONY : release
release : $(OBJDIR_R)/$(EXEFILE) $(DYNAMIC_LIBS) versioninfo
<snip>
$(OBJDIR_R)/$(EXEFILE) : $(ARCHIVES_R)
$(CXX) -o $(OBJDIR_R)/$(EXEFILE) -ldl
-Wl,-whole-archive,-export-dynamic $(ARCHIVES_R) $(EXTRA_LIBS_R)
<snip>
$(ARCHIVES_R) $(ARCHIVES_D) : $(STATIC_LIBS)
Well, whether your static libraries depend on the dynamic libraries
depends on whether this dependency really exists. It is conceivable that
any of your static libraries could load any of the dynamic libraries at
run-time, so that in this case such a dependency does exist. However, it
is likely that this dependency have already been specified in the
makefile that builds the static and dynamic libraries as it should, so
that it does not need to be repeated in another makefile.
(versionInfo is a small utility that we also want built.
versionInfo could simply be a plain text file with versions of
executables and shared libraries. The link rule would extract the
corresponding version of the binary being linked from that text file
(grep, sed, awk, ...) and embed that version into the binary. Updating
this text file would trigger a relink (a complete relink though, so it
should not be updated too often). Something like:
lib/libsome.so 1.2.3
bin/some_app 2.3.4
--
Max
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