use case: directly symlink zig binary to /usr/bin/cc

[andrewrk]

The idea here is that zig would pay attention to its argv[0] when invoked, and handle certain names specially. For example, if the basename of argv[0] is cc then this would invoke zig cc without an extra cc parameter, and zig could be the system C compiler.

Thanks to Lietu for the idea.

Some other things to consider:

• also supporting zig c++ (see support compiling and linking c++ code #4786)
• also supporting being symlinked to a compiler name that has a target in it. For example, /usr/bin/riscv64-linux-musl-cc would work, and it would set the target. This is because some systems expect this to be how to invoke a cross compiler, rather than passing a -target parameter.

[shawnl]

also supporting being symlinked to a compiler name that has a target in it. For example, /usr/bin/riscv64-linux-musl-cc would work, and it would set the target. This is because some systems expect this to be how to invoke a cross compiler, rather than passing a -target parameter.

clang has never been used this way. This is only because gcc cross-compilation is not as flexible as clang's and you have to recompile it for the target.