[llvm-bugs] [Bug 49750] New: llvm::writeArchive(..) fails when path contains %

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49750

            Bug ID: 49750
           Summary: llvm::writeArchive(..) fails when path contains %
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Object
          Assignee: unassignedbugs at nondot.org
          Reporter: kevin at segfault.fun
                CC: llvm-bugs at lists.llvm.org

If the filesystem path passed to writeArchive(..) contains a `%` it will fail
with "No such directory". I believe this is because sys::fs::createUniquePath()
gets called and replaces all `%` with a random number. It looks like
sys::fs::TempFile::create(Prefix + ".temp-archive-%%%%%%%.a") is common in the
LLVM tree, and `Prefix` is assumed to contain no `%` characters. Not exactly
sure how LLVM wants to resolve this, but my suggestion would be to take
direction from the `mktemp` API.

Downstream bug reported here: https://github.com/rust-lang/rust/issues/79567

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