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Disable PDB generation in stage1 of the clang-cl self-host bot #195

Closed rnk closed 4 months ago

rnk commented 4 months ago

PDB generation is resource-intensive and does not perform well for statically linked unit tests. The stage2 build generates PDBs to exercise clang-cl's debug info generation abilities, but we generally do not use the debug info from the stage 1 builds. PDB build errors are also a common source of builder unreliability and lead to excessive disk usage, so disable them for now.

Here is a recent example of PDB unreliability: https://lab.llvm.org/buildbot/#/builders/123/builds/26898

... GeneratorTest.cpp: fatal error C1051: program database file, '...\vc140.pdb', has an obsolete format, delete it and recompile
rnk commented 4 months ago

Thanks! Theoretically, the annotated buildbot recipe will let me submit this and immediately see if my results are reflected on the next build.

lnihlen commented 4 months ago

Sounds good. I'm off today, but hobby hacking, so I'm around if you need me to poke something on the cloud side.

rnk commented 4 months ago

The stage1 CMake args took effect in this build: https://lab.llvm.org/buildbot/#/builders/123/builds/26903

It will take two hours to finish the self-host build, but I expect it will come back green this time.