[llvm-bugs] [Bug 40689] New: Whitespace added during assembly

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40689

            Bug ID: 40689
           Summary: Whitespace added during assembly
           Product: clang
           Version: unspecified
          Hardware: All
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: adam at ahri.net
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Whitespace added during assembly breaks some files:

    $ cat > bug
    #!/bin/sh
    #ifdef mingw32_HOST_OS
    echo windows
    #else
    echo not windows
    #endif

When assembled:

    $ clang -E -x assembler-with-cpp bug
    # 1 "bug"
    # 1 "<built-in>" 1
    # 1 "bug" 2
     #!/bin/sh



    echo not windows


Note the space added before the shebang.

More specifically, this breaks Haskell scripts that use clang to assemble files
which in turn employ the CPP extension; the leading space confuses the Haskell
compiler, stopping it from ignoring the shebang line and failing with a Haskell
compilation error.

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