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Env vars that change compiler output make it impossible to write tools such as ccache or distcc. Including the entire env in the hash value that determines whether ccache has a cache hit (as well as the compiler command line and the preprocessed source file) would be ridiculous and would result in very few cache hits. On Thu, Sep 6, 2018 at 11:34 AM, Matthias Braun via llvm-dev < llvm-dev at

Yes, but in your example getenv is called every time enableFooBar needs to be initialized. What if your code is itself wrapped inside another loop you can't see (for example, the PassManager invoking passes)? Maybe I'm being overly pedantic. We use a lot of environment variables in our compiler because it's really super annoying and takes a lot of developer time to have to update

This patch modifies the physinfo hcall to export NUMA CPU and Memory topology information. The new physinfo hcall is integrated into libxc and xend (xm info specifically). Included in this patch is a minor tweak to xm-test''s xm info testcase. The new fields in xm info are: nr_nodes : 4 mem_chunks : node0:0x0000000000000000-0x0000000190000000