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Rollup merge of #98434 - dpaoliello:staticcrt, r=jyn514

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Ensure that `static_crt` is set in the bootstrapper whenever using `cc-rs` to get a compiler command line.

When attempting to build rustc with LLVM on Windows, I noticed that the CRT flag provided to the C and C++ Compilers was inconsistent:

```
"-DCMAKE_C_FLAGS=-nologo -MT -Brepro" "-DCMAKE_CXX_FLAGS=-nologo -MD -Brepro"
```

Since the bootstrapper also sets the various `LLVM_USE_CRT` variables, this resulted in cl.exe reporting a bunch of warnings:

```
cl : Command line warning D9025 : overriding '/MD' with '/MT'
```

The root cause for this is that `cc_detect::find` was creating a `cc::Build` twice, but didn't set `static_crt` the second time.

It's possible that this what is also causing #81381
This commit is contained in:
Matthias Krüger 2022-06-29 20:34:58 +02:00 committed by GitHub
commit 96bb98c9c0
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1 changed files with 27 additions and 30 deletions
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37
src/bootstrap/cc_detect.rs
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@ -61,17 +61,7 @@ fn cc2ar(cc: &Path, target: TargetSelection) -> Option<PathBuf> {
}
}
pub fn find(build: &mut Build) {
// For all targets we're going to need a C compiler for building some shims
// and such as well as for being a linker for Rust code.
let targets = build
.targets
.iter()
.chain(&build.hosts)
.cloned()
.chain(iter::once(build.build))
.collect::<HashSet<_>>();
for target in targets.into_iter() {
fn new_cc_build(build: &Build, target: TargetSelection) -> cc::Build {
let mut cfg = cc::Build::new();
cfg.cargo_metadata(false)
.opt_level(2)
@ -92,7 +82,21 @@ pub fn find(build: &mut Build) {
}
}
}
cfg
}
pub fn find(build: &mut Build) {
// For all targets we're going to need a C compiler for building some shims
// and such as well as for being a linker for Rust code.
let targets = build
.targets
.iter()
.chain(&build.hosts)
.cloned()
.chain(iter::once(build.build))
.collect::<HashSet<_>>();
for target in targets.into_iter() {
let mut cfg = new_cc_build(build, target);
let config = build.config.target_config.get(&target);
if let Some(cc) = config.and_then(|c| c.cc.as_ref()) {
cfg.compiler(cc);
@ -112,15 +116,8 @@ pub fn find(build: &mut Build) {
// If we use llvm-libunwind, we will need a C++ compiler as well for all targets
// We'll need one anyways if the target triple is also a host triple
let mut cfg = cc::Build::new();
cfg.cargo_metadata(false)
.opt_level(2)
.warnings(false)
.debug(false)
.cpp(true)
.target(&target.triple)
.host(&build.build.triple);
let mut cfg = new_cc_build(build, target);
cfg.cpp(true);
let cxx_configured = if let Some(cxx) = config.and_then(|c| c.cxx.as_ref()) {
cfg.compiler(cxx);
true