This saves a lot of diskspace, when symlinks are turned into full
copies of the tools on windows, as the symlinks only point to a small
wrapper instead of to the full tool.
When adding the terminator without incrementing arg and checking for
overflows with "arg > max_arg", we need to allocate space for one
extra element for the implicit terminator.
Convert paths with backslashes to forward slashes.
libtool tries to parse this output in order to find object files and
libraries that always should be linked in, but libtool can't handle
paths with backslashes (and quotes) which clang currently outputs.
This is a quick and ugly workaround until clang can be made to
output paths with forward slashes on windows, see
https://reviews.llvm.org/D53066 for progress on that matter.
If we try to do that, clang would end up calling <triplet>-gcc with the
same arguments. In our setup, this recursively ends up calling clang again,
ending up with infinite recursion.
We quote each passed through argument, and escape quote chars in them.
For cases when the passed through argument ends with a backslash, this
fails though, since whatever is unescaping it doesn't seem to handle
double backslashes for escaping backslashes themselves.
This allows non-msys build systems to use the triplet prefixed
compiler frontends on windows.
Keep the old shell script version as well, for easier hackability
on unix platforms.
Martin Storsjö