Volk build issues on MinGW

Several minor issues and one major issue were encountered in building
the
volk library on MinGW. The minor issues are:

(1) The use of symbolic links for volk/config.{sub,guess} is a problem.
I
used a Cygwin version of git that produced Cygwin symlinks, which are
unusable in MinGW. A version of git exists for MSYS, but I’m not sure
it
handles symbolic links. Is it possible to avoid using symbolic links in
the
git repository?

(2) configure fails while testing for -lboost_unit_test_framework
because
of the presence of “-Wl,–enable-runtime-pseudo-reloc” in LDFLAGS. I’m
not
sure why it is a problem, but I don’t think these flags are needed at
all in
this situation. (Note: Cygwin had the same problem, and the solution
used
there also works for MinGW.)

(3) volk/lib/testqa.cc requires the boost unit_test library. This
needs to
be documented.

(4) boost/test/unit_test.hpp not found in volk/lib/testqa.cc: I think
we
need to include $(BOOST_CPPFLAGS) in testqa_CPPFLAGS in
volk/lib/Makefile.am.

A big problem is that posix_memalign (used in the volk test program)
will
never run on Windows. Given that aligned memory will be needed to use
volk,
this becomes a major issue that will need to be addressed for future
development of GNU Radio. I will have further comment on this issue in
a
separate thread.

– Don W.

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