[llvm-bugs] [Bug 49234] New: -Xclang -emit-llvm -save-temps tries to parse bitcode as cpp-output, fails

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49234

            Bug ID: 49234
           Summary: -Xclang -emit-llvm -save-temps tries to parse bitcode
                    as cpp-output, fails
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jonathanchesterfield at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

E.g. https://godbolt.org/z/WWoKeb

-Xclang -emit-llvm is passed to the preprocessor invocation, which writes IR
instead of annotated c++. clang -x cpp-output fails to parse IR, error:
expected ';' after top level declarator

Similarly with -Xclang -emit-llvm-bc -save-temps, https://godbolt.org/z/3zErf7,
which rejects 'BC<C0><DE>5<U+0014><U+0000>...' as not being valid UTF-8.

I would guess the fix for this is similar to however -emit-llvm is handled,
since -emit-llvm -save-temps works. -### suggests the -emit-llvm clause is
removed for the preprocessor invocation.

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