ychen added a comment. Thanks for the inputs @steven_wu @tejohnson. Totally agree with the points you brought up. One last thing I'm not quite sure is the caching of `-fthin-link-bitcode`. It is a `-cc1` option since it is a kind of implementation of ThinLTO, right? I'm a little hesitant to begin writing up patches to teach build system/caching tool (I could think of at least three for our workload) to recognize this option because of that. If there are any changes to the option, the same thing needs to be done again. Do you have any thoughts on that? Is the option in use for your workload and do you think it is stable enough to have build systems caching for it? (Another option is to produce `-fthin-link-bitcode` output post compile time which I assume having total build time impact to some degree).
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