Hello. I would like to ask folks what is their opinion about support of precompiled headers for future releases of GCC. From my point of view, the feature brings some speed-up, but question is if it's worth for?
Last time I hit precompiled headers was when I was rewriting memory allocation statistics infrastructure, where GGC memory is 'streamed' and loaded afterwards in usage of precompiled headers. Because of that I was unable to track some pointers that were allocated in the first phase of compilation. There are numbers related to --disable-libstdcxx-pch option: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz: Boostrap time w/ precompiled headers enabled: 35m47s (100.00%) Boostrap time w/ precompiled headers disabled: 36m27s (101.86%) make -j9 check-target-libstdc++-v3 -k time: precompiled headers enabled: 8m11s (100.00%) precompiled headers disabled: 8m42s (106.31%) Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz: Boostrap time w/ precompiled headers enabled: 57m35s (100.00%) Boostrap time w/ precompiled headers disabled: 57m12s (99.33%) Feel free to send any statistics, opinions and ideas. Thank you, Martin
