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The introspection interpreter sometimes produces targets with no source
files; BuildTarget will then pick a random compiler, according to the
order in clink_langs.
According to the comment in sort_clink, clink_langs are supposed
to list languages from *lowest* to highest priority. However,
process_compilers_late() process clink_langs in straight order and
returns the first language; which is the one with lowest priority.
This became visible with the addition of Rust to clink_langs,
because Rust has limitation on the names of library targets, but
the bug existed before.
Fixes: e49f2f7283e1d9f18e2f5f54647c07287cd70339
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Rust by default links with the default MSVCRT, (dynamic, release).
MSVCRT's cannot be mixed, so if Meson compiles a C or C++ library and
links it with the debug MSVCRT, then tries to link that with the Rust
library there will be failures. There is no built-in way to fix this for
rustc, so as a workaround we inject the correct arguments early in the
linker line (before any libs at least) to change the runtime. This seems
to work and is recommended as workaround in the upstream rust bug
report: https://github.com/rust-lang/rust/issues/39016.
Given that this bug report has been opened since 2017, it seems unlikely
to be fixed anytime soon, and affects all (currently) released versions
of Rust.
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Otherwise we might not get things like libstdc++, which we need.
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