* bintools: disable -pie when -r or -Ur are used
ld’s -r allows you to partially link object files. When -pie is passed with -r, though, we get:
ld: -r and -pie may not be used together
Most build systems are intelligent enough to pass -no-pie before -r, but we might as well support those that
don’t.
Note: -pie is not enabled by default in Nixpkgs, but it is when you are using musl. So this solution is really
only useful for musl toolchains.
* bintools-wrapper: Add incremental -i check for pie
I hate the thing too even though I made it, and rather just get rid of
it. But we can't do that yet. In the meantime, this brings us more
inline with autoconf and will make it slightly easier for me to write a
pkg-config wrapper, which we need.
Factor a bintools (i.e. binutils / cctools) wrapper out of cc-wrapper. While
only LD is wrapped, the setup hook defines environment variables on behalf of
other utilites.
