We already did this for -march in 12b0e8ac74 ("clang: don't set
-march for overridden target"), but it should have been done for all
machine flags, for the same reason.
Example bug this fixes:
nix-shell -E '
with import ./. {
crossSystem = {
system = "powerpc64le-linux";
gcc.cpu = "power10";
};
};
clangStdenv.mkDerivation { name = "test"; }
' --run '$CC -target wasm32-unknown-unknown -c /dev/null'
Which previously failed with:
clang: error: unsupported option '-mcpu=' for target 'wasm32-unknown-unknown'
Alyssa Ross
6f756b4065