disallow specification of both -dynamic and -static simultaneously when calling zig build-exe

[elerch]

As it says on the tin. See discussion in #8248

[ifreund]

I don't think this is a desirable change. The current behavior of the flag set later in the command line overriding any previous flags setting the same thing is inline with the behavior of all other flags. For example, all of the -ffoo/-fno-foo options work this way.

[elerch]

I'm not offended either way - it was just the discussion on the other PR so I thought I'd offer the code for consideration.

/cc @data-man@tauoverpi

[data-man]

For example, all of the -ffoo/-fno-foo options work this way.

And it's bad.

clang <some_file> -dynamic -static

clang-11: error: invalid argument '-dynamic' not allowed with '-static'

[Vexu]

Hi @elerch, we discussed this in the self hosted compiler meeting and decided that the current behavior of them being able to override each other is desirable. However I have opened #9071 proposal to rename the flags to make this behavior more obvious.