https://bugs.llvm.org/show_bug.cgi?id=42966
Bug ID: 42966
Summary: Regression(r365860) New fomit-frame-pointer /
momit-leaf-frame-pointer handling leads to unfriendly
diagnostics
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Say you want frame pointers but no leaf frame pointers (because you want to
unwind, but including leaf frame pointers makes llvm run out of registers -- cf
PR15798).
So you pass -fno-omit-frame-pointer -momit-leaf-frame-pointer to all compiles.
Some specific translation unit wants to omit frame pointers for some reason
though, so it tacks on fomit-frame-pointer. Previously that worked fine.
Now it results in
clang: warning: argument unused during compilation: '-momit-leaf-frame-pointer'
[-Wunused-command-line-argument]
That's true, but it's also not helpful. There's no good way in practice to fix
this warning if it arises in a situation like this.
We should probably manually claim the momit flags if the fomit flags are seen.
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