[llvm-dev] [lld] Reject some lld specific one-dash long options (original) (raw)
Fangrui Song via llvm-dev llvm-dev at lists.llvm.org
Tue May 5 16:01:52 PDT 2020
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GNU ld supports most long options with either one or two dashes. For compatibility, lld has to support both.
For newer and lld specific options, we don't have such compatibility problem. I'd suggest we reject one-dash long options to avoid collision with short options. For example,
- -lto-emit-obj can be read as -l to-emit-obj
- -thinlto-cache-dir= means -t -h inlto-cache-dir= in GNU ld
I created a patch https://reviews.llvm.org/D79371 to disallow some one-dash long options. These options are carefully chosen: I can't find anything depending on their one-dash forms.
lld has a spell corrector for option names so a misspelled -lto-emit-obj can be identified quickly.
Thoughts?
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