Commits on Oct 6, 2014

1. make release builds the default …

   This cuts the compilation time for a trivial Rust program by 15-20% on
   Windows due to a massive improvement in `rustc` start-up time. The debug
   logging has a very high cost because it makes extensive use of mutable
   global variables and those result in expensive relocations. It also
   makes jemalloc debug assertions / logging tied to the same flag as ones
   in the standard library or compiler.
   
   Enabling debug assertions by default discourages their use, because
   normal builds will be paying a cost for each one. The few debug
   assertions not removed before landing a pull request are a significant
   performance problem for types like `RefCell`.
   
   The defaults should cater to users or packagers building Rust rather
   than compiler developers. A compiler developer can be expected to
   override a default flag, but the same cannot be said of someone who
   lacks the same in-depth knowledge of the project.
   
   Even someone working on the standard libraries is not going to want to
   pay the high cost for debug logging. Many people who contribute to the
   compiler don't use the feature either, because a debugger tends to work
   a lot better than inconsistent / bit-rotted logging code.

   

   thestinger committed Oct 6, 2014
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