Re: Autoconf building, linking across multiple source directories?

[John Calcote]

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Eric Jonas wrote:
> src/
>    foo.cc
>    bar.cc
>    main.cc
>    Makefile.am
> 
> tests/
>    foo_test.cc
>    bar_test.cc
>    testrunner.cc
>    Makefile.am
> 
> What I'd like to be able to do is build "testrunner" from testrunner.o,
> foo_test.o, bar_test.o, and crucially, foo.o and bar.o. But I can't
> figure out how to specify in the tests/Makefile.am that it depends on
> object files outside of it's particular directory subtree. Ideally I'd
> be able to avoid explicitly referencing each-and-every source file in
> src/, as I hope to soon have a lot of them. Is this possible? 

You could create a static convenience library in src/Makefile.am as follows:

src/Makefile.am:
- -----------------
bin_PROGRAMS = myprog
check_LTLIBRARIES = libtest.la
common_srcs = foo.cc bar.cc
myprog_SOURCES = $(common_srcs) main.cc
libtest_la_SOURCES = $(common_srcs)

tests/Makefile.am
- -----------------
check_PROGRAMS = testrunner
testrunner_SOURCES = testrunner.cc foo_test.cc bar_test.cc
testrunner_LDADD = ../src/libtest.la

Of course, this could just as easily have been done without Libtool by
using the LIBRARIES primary, and a few other syntactical differences,
but I prefer Libtool, as the syntax is simpler.

Regards,
John



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