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.
