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This function runs a command with the MSYS environment.  It gets the command and arguments
either as passed to it, or if none are passed the the command is expected to be in
@ARGV.

If the command fails then it will L<exit|perlfunc#exit> with a non-zero error code.  This
is useful, in the second example above if either C<make> or C<make install> fails, then
the whole command will fail, also C<make install> will not be attempted unless C<make>
succeeds.

=head2 msys_path

This function returns the full path to the MSYS bin directory.

=head1 CAVEATS

This L<Alien> is big and slow to install.  I am aware this is an annoying problem.
It is also the only reliable way (that I know of) to install packages from source
that use autotools on Strawberry or Visual C++ Perl.  Here are some things that you
can do to avoid this painful cost:

=over 4

=item Use the system library if possible

The L<Alien::Build> system is usually smart enough to find the system library
if it is available.  L<Alien::MSYS> is usually only necessary for so called
C<share> installs.

=item Pre-install MSYS

As mentioned above if you preinstall MSYS and set the C<PERL_ALIEN_MSYS_BIN>
environment variable, then you will save yourself some time if you use multiple
installs of Perl like I do.

=item Use another build system

Some projects will provide a makefile that will work with GNU Make and C<cmd.exe>
that you can build without MSYS.  An example of an Alien that takes advantage of
this is L<Alien::libuv>.

Some projects provide both autoconf and CMake.  Although using CMake reliably
requires L<Alien::cmake3> for C<share> installs, it is much much lighter than L<Alien::MSYS>.

Also obviously you can open a ticket, or make a pull request with the project that you
are alienizing to support build systems that don't suck as much as autoconf.

=item Use MSYS2

Strawberry Perl is convenient for building XS modules without any dependencies
or just dependencies on the small number of libraries that come bundled with
Strawberry Perl.  It is very very painful in my opinion if you depend on libraries
that are not bundled, which is why this Alien exists.  There is an alternative though.

MSYS2 / MinGW provides a MSWin32 Perl as part of a Linux / open source like package
that provides probably all of the libraries that you might want to use as dependencies,
and if it doesn't you can build much easier than with Strawberry + Alien::MSYS.

There are some notes here:

L<https://project-renard.github.io/doc/development/meeting-log/posts/2016/05/03/windows-build-with-msys2/>

On using the MSYS2 / MinGW / MSWin32 Perl from the MSYS2 project.

=back

=head1 AUTHOR

Author: Graham Ollis E<lt>plicease@cpan.orgE<gt>

Contributors:

Shawn Laffan (SLAFFAN, shawnlaffan)

bekuno

Zaki Mughal (zmughal)

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2013-2022 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut