emscripten-core/emscripten
Compiler information extraction significantly slower compared to vanilla Clang
Offen
#13.004 geöffnet am 10.12.2020
help wantedwontfix
Repository-Metriken
- Stars
- (27.361 Sterne)
- PR-Merge-Metriken
- (Durchschn. Merge 19T 10h) (147 gemergte PRs in 30 T)
Beschreibung
Extracting some basic information (version, target, header search paths) from emcc is significantly slower compared to vanilla Clang. Compare:
$ time { clang++ --version; clang++ -dumpmachine; clang++ -v -x c++ -E - </dev/null; }
real 0m0.029s
$ time { emcc --version; emcc -dumpmachine; emcc -v -x c++ -E - </dev/null; }
real 0m0.266s
Some build systems (e.g., build2) extract this information on the fly (in order to implement high-fidelity change detection) and the slowdown is noticeable. I wonder if anything can done about this?