[libcxx-commits] [libcxx] [libcxxabi] [libunwind] [llvm] [runtimes] Probe for -nostdlib++ and -nostdinc++ with the C compiler (PR #108357)

[Vitaly Buka via libcxx-commits]

vitalybuka wrote:

> > > > Actually this PR is the case of https://lab.llvm.org/buildbot/#/builders/164/builds/3908, not #113491
> > > 
> > > 
> > > Sorry about that.
> > > Are you able to dig up any of the cmake configure logs from these builds, so that we can figure out how this ends up breaking things? Because as in most of these cases, the visible output in the buildbot logs mostly say that some configure checks end up going the wrong way, but we can't really see why.
> > 
> > 
> > @vitalybuka Are you able to pull out some details to help figure out what this really broke here?
> 
> Ping @vitalybuka - can you help out with retrying this PR and providing some details about what went wrong, so that we can have a path towards merging this again?

Sure, I can retry the build locally, but would be more convenient for you to just reproduce according to  https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild ?
libcxx step is very early, so no need to wait for entire build.

I guess you can just copy cmake invocation from 
https://lab.llvm.org/buildbot/#/builders/sanitizer-x86_64-linux-bootstrap-msan/
you need steps:
1.  stage1 build all
2.  stage2/msan build libcxx


https://github.com/llvm/llvm-project/pull/108357