Commits on Sep 30, 2019

1. Build with optimizations by default …

   GCC builds without optimizations by default while Clang uses -O2.
   Use -O2 for GCC by default too, but switch to -O0 when DEBUG is
   defined. Also make sure to always output debug information, not
   only in debug builds. Additional sections with it do not impact
   performance but are very useful in production. And they can be
   easily stripped out of the binaries if necessary, like we do when
   building packages.
   
   We disable frame pointer omission optimization to get better stack
   frames and enable debugging on x86. While it has some impact, I'd
   rather have working backtraces.

   

   ilammy committed Sep 30, 2019
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