[llvm-bugs] [Bug 28323] New: [PM] Use new PM in production for Clang, LLD, libLTO, etc. middle-end

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28323

            Bug ID: 28323
           Summary: [PM] Use new PM in production for Clang, LLD, libLTO,
                    etc. middle-end
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: chisophugis at gmail.com
                CC: llvm-bugs at lists.llvm.org
            Blocks: 28322
    Classification: Unclassified

This bug tracks progress towards moving the main middle-end compilation
codepath of Clang, LLD, libLTO, etc. to the new PM.

Clang will be the most work for this. Essentially the entirety of
PassManagerBuilder in lib/Transforms/IPO/PassManagerBuilder.cpp needs to be
ported, including the "extension" point stuff.

The part of PassBuilder (lib/Passes/PassBuilder.cpp) which seems intended to
replace PassManagerBuilder is mostly FIXME's at the time of this writing.

Porting the LTO use case seems like a good first step.

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