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Issue with creation of static archive libraries


From: Vardhan, Sundara (GE Energy)
Subject: Issue with creation of static archive libraries
Date: Wed, 15 Sep 2010 23:14:05 -0400

Hi All

I have recently made changes to my makefiles and changed the construct
of using ar command to create the static archive libraries. The
libraries are created by object files residining in different
subdirectories. The makefile in the parent directory recursively calls
the makefiles in each of the subdirectories which compiles the source
file and runs the ar command to attach the objects files of the
subdirectory to the static library. What happens is sometimes an
subdirectory with say only one source file, gets compiled and object
file is created but no ar command is run and hence that object file is
not included in the static archive library. This causes undefined
reference errors later when an application tries to link to this library
and is using a function call defined in the object file that is not
included. 

Is this a bug in the make rules? Is there a way that I can ensure that
this does not happen? I would very much appreciate your advice and
inputs. Please find below the ar declaration of one of the Makefile that
is used to compile and create the archive.


$(LIBDIR)/db/libmbacc$(MACHINE).a: $(OBJS)
    $(AR) $(ARFLAGS) $@ $^
    @$(RANLIB) $@

Thanks in advance.

With Regards

Vardhan







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