Option to build shared libraries with Alien::GSL (static libraries does not work with Math::GSL)

[hakonhagland]

Unfortunately Math::GSL cannot use a static libgsl.a, see leto/math--gsl#225 and this bug report. This is because Math::GSL is building more than one XS module, and each module depends on libgsl.a and libgsl.a maintains static variables. These static variables will get duplicated when linking statically with libgsl.a and cause undefined behavior when the XS modules are combined in a Perl script.

I think this is only a problem for Math::GSL so I wonder if we should provide an option to Alien::GSL to build a shared library (libgsl.so) when doing a shared install? For example something like: use Alien::GSL qw(:shared) would force building a shared library?

What do you think?

[hakonhagland]

Unfortunately Math::GSL cannot use a static libgsl.a

I discovered that @sisyphus has reported the same issue 16 years ago, see: https://rt.cpan.org/Ticket/Display.html?id=38574