MSYS+MSVC for libtool branch-2-0

[Peter Ekberg]

Hello!

I started an attempt to support the MSVC compiler natively
(w/o the cccl script, which I haven't tried to be honest)
and using MSYS to drive the scripting. With this (rough)
patch I am able to build and use shared libraries (libs
and modules) and convenience libraries. I haven't tested
static libs (I haven't gone through the pain of bootstraping
on Cygwin, which would require building some current
autotools from scratch.)

I realize that this is not likely an acceptable patch.
Perhaps libname_spec should be just $name on MSVC? Instead
of doing that, I added a second very similar loop in
ltmain.sh, but that might be a cludge?

This patch was taken from a libtoolized project (I wrote
the patch), I think I converted all [...] in its ltmain.sh
to [[...]] when I patched ltmain.m4sh in libtool branch-2-0,
but I'm not 100% sure as I didn't actually test the result
(due to the above bootstrap troubles).

But I'd very much appreciate comments on the general
approach, so that I know if I should just throw the whole
thing in the bin now rather than later if I'm way off...



I configure the libtoolized project with

.../configure CC="cl -MD" LDFLAGS=-L/msvc/lib

Where MSYS has a mount so that /msvc points to the MSVC folder
(typically "C:\Program Files\Microsoft Visual Studio\VC98"
or something similar)

Cheers,
Peter