Setting system gcc when `port select --set gcc app-gcc*` is set

[Steven Smith]

I have a build failure on a system with `port select --set gcc mp-gcc9` set:

> :info:build /opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/include-fixed/ma
> th.h:45:10: error:
> :info:build      fatal error: sys/cdefs.h: No such file or directory
> :info:build        45 | #include <sys/cdefs.h>
> :info:build           |          ^~~~~~~~~~~~~


This is with the port hlint, which uses port group haskell_cabal:
https://github.com/macports/macports-ports/blob/master/_resources/port1.0/group/haskell_cabal-1.0.tcl <https://github.com/macports/macports-ports/blob/master/_resources/port1.0/group/haskell_cabal-1.0.tcl>

The build works if I make sure that “gcc” points to /usr/bin/gcc.

How should this be done in MacPorts to avoid this issue? I just want to make sure that the native system gcc is used, not the MacPorts gcc.

We’re already setting these compiler options in haskell_cabal:

> compiler.library_path
> compiler.cpath

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