[5.2] [tibs] Detect clang index support using -help instead of --version #106
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The previous check for apple-clang, swift-clang, etc. was failing on released toolchains, since they don't contain the repo name, and on clones of the repo that didn't match the pattern. Check clang -help for index store support. It would be better to check that `clang -index-store-path /dev/null --version` does not produce an error, but unfortunately older versions of clang accepted `-index-store-path` due to the existince of a `-i` option that has since been removed. While we could check a full compile command, I have not found a robust command that detects index support without also doing I/O in the index directory when it succeeds. To avoid I/O, we check -help.
benlangmuir
approved these changes
Jul 8, 2020
drexin
changed the title
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The previous check for apple-clang, swift-clang, etc. was failing on
released toolchains, since they don't contain the repo name, and on
clones of the repo that didn't match the pattern.
Check clang -help for index store support. It would be better to check
that
clang -index-store-path /dev/null --versiondoes not produce anerror, but unfortunately older versions of clang accepted
-index-store-pathdue to the existince of a-ioption that has sincebeen removed. While we could check a full compile command, I have not
found a robust command that detects index support without also doing I/O
in the index directory when it succeeds. To avoid I/O, we check -help.