On 10/26/2017 01:50 PM, Jakub Jelinek wrote: > On Thu, Oct 26, 2017 at 05:12:40PM +0000, Wilco Dijkstra wrote: >> GCC's default optimization level is -O0. Unfortunately unlike other >> compilers, >> GCC generates extremely inefficient code with -O0. It is almost unusable for >> low-level debugging or manual inspection of generated code. So a -O option >> is >> always required for compilation. -Og not only allows for fast compilation, >> but >> also produces code that is efficient, readable as well as debuggable. >> Therefore -Og makes for a much better default setting. >> >> Any comments? >> >> 2017-10-26 Wilco Dijkstra <wdijk...@arm.com> >> >> * opts.c (default_options_optimization): Set default to -Og. >> >> doc/ >> * invoke.texi (-O0) Remove default mention. >> (-Og): Add mention of default setting. > > This would only severely confuse users. -Og has lots of unresolved issues > for debugging experience, and changing the default this way is IMHO > extremely undesirable. And changing a default that has been in place for 30 years just seems unwise at this point.
jeff
