Re: variables in _SOURCES

[Bert Wesarg]

Daniel,

this is still a known bug in released versions of autotools, see

http://debbugs.gnu.org/13928

Best,
Bert

On Sun, Jun 12, 2016 at 9:22 AM, Daniel Pocock <address@hidden> wrote:
>
>
> According to the "Warning" in this page[1], it is not permitted to use
> variables in _SOURCES.  Is this deliberate or is it a bug?
>
> In our project, we started getting the warnings about subdir-objects and
> so we added[2]
>
>   AM_INIT_AUTOMAKE([foreign subdir-objects])
>
> However, since that time the build has been failing[3] and it appears to
> be because one module[4] is using a variable in _SOURCES
>
> The $PYCXX_SRCDIR variable is used to refer to the sources provided by
> the PyCXX[5] library.  PyCXX is not distributed as a compiled library
> that can be linked against, the sources are simply placed under
> /usr/share by the packages (e.g. on Debian[6]) and users have to compile
> them into their projects by referring to them from their Makefile.
>
> What is the recommended way of using such sources in a build?  I could
> write some Makefile rule to copy or symlink the sources in to the tree,
> but is there an official way to solve this with autotools?
>
> More specifically, I am using them like this:
>
> configure:
>
> ./configure ... \
>    --with-python \
>    PYCXX_SRCDIR=/usr/share/python2.7/CXX/Python2
>
>
> Makefile.am:
>
> nodist_libpyroute_la_SOURCES = $(PYCXX_SRCDIR)/cxxextensions.c
> nodist_libpyroute_la_SOURCES += $(PYCXX_SRCDIR)/cxx_extensions.cxx
> nodist_libpyroute_la_SOURCES += $(PYCXX_SRCDIR)/cxxsupport.cxx
> nodist_libpyroute_la_SOURCES +=
> $(PYCXX_SRCDIR)/../IndirectPythonInterface.cxx
>
>
>
>
> 1. https://autotools.io/automake/nonrecursive.html
> 2.
> https://github.com/resiprocate/resiprocate/commit/fb37bc86db9f1b7d569eb2a17acd1e683b6ce55f
> 3. https://travis-ci.org/resiprocate/resiprocate/builds/131873177
> 4.
> https://github.com/resiprocate/resiprocate/blob/master/repro/plugins/pyroute/Makefile.am
> 5. http://cxx.sourceforge.net/
> 6.
> https://packages.debian.org/search?searchon=contents&keywords=cxxextensions.c&mode=path&suite=stable&arch=any
>
>