> Using gcc 6.3, my C++ source file compiles in 1m2s with -O0. With snapshot 20190414 (compiled with --disable-checking > and -O2 and make install-strip), it takes 31 minutes to compile the same file with -O0. Have I overlooked disabling some > snapshot self-checking code? Are there known configuration mistakes that could result in this sort of performance > degradation? Thanks! It will take a while to go back and try other gcc 6, 7, 8, and 9 snapshots to collect points of reference. > Both are pretty heavy on memory, gcc6 uses 3.7G and gcc9 uses 5.4G for this file. There's a lot of templatized headers. Latest data points: gcc-6.3/6.4 take about 43 seconds gcc-7.2 takes 30 minutes gcc-8.2 takes 27 minutes gcc-9.0 takes 31 minutes (snapshot 20190414) clang 6.0.1/7.01 take about 31 seconds This is frustrating, as I'm going to have to capitulate to using clang here for a very large user base. We've been a gcc shop for decades.
