[llvm-bugs] [Bug 34544] New: cc1as chokes on assembly from clang's `-S` option when WebAssembly is the target

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34544

            Bug ID: 34544
           Summary: cc1as chokes on assembly from clang's `-S` option when
                    WebAssembly is the target
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: WebAssembly
          Assignee: unassignedbugs at nondot.org
          Reporter: mvogelsang at rocketmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19129
  --> https://bugs.llvm.org/attachment.cgi?id=19129&action=edit
wasm-main.s

If we have the file `main.c` with the contents
'''
int main() { return 1; }
'''

and $CC is a clang built to target wasm32-unknown-unknown-wasm, we can produce
assembly with `$CC -S main.c`.
However, clang can't process the resulting main.s file, although it's contents
seem perfectly valid. Running `$CC main.s` results in
`clang -cc1as: error: unknown target triple 'wasm32-unknown-unknown-wasm',
please use -triple or -arch`

Doing the same process with a clang set to target aarch64-unknown-linux-gnu
results in perfectly fine code built for ARM. 

The relevant .s files are attached

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