[llvm-bugs] [Bug 49536] New: #pragma comment(lib) not ignored with MS extensions disabled

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49536

            Bug ID: 49536
           Summary: #pragma comment(lib) not ignored with MS extensions
                    disabled
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: c.schaerf at t-online.de
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Even without MS extensions, Clang still follows the #pragma comment (lib)
directive.

According to the documentation [1], they should per default only be active on
Windows platforms. However, on Linux and even with -fno-ms-extensions
explicitly set, the directive is still followed.

The source code

#pragma comment(lib, "testlib.lib")

int main() {
    return 0;
}

compiles to the following assembly:

        .text
        .file   "test.cpp"
        .globl  main                            # -- Begin function main
        .p2align        4, 0x90
        .type   main, at function
main:                                   # @main
        .cfi_startproc
# %bb.0:
        xorl    %eax, %eax
        retq
.Lfunc_end0:
        .size   main, .Lfunc_end0-main
        .cfi_endproc
                                        # -- End function
        .section        .deplibs,"MS", at llvm_dependent_libraries,1
        .ascii  "testlib.lib"
        .byte   0
        .ident  "clang version 13.0.0 (https://github.com/llvm/llvm-project
bc5e9ec2dccdd18f840a09fe63c196ae25ad99d5)"
        .section        ".note.GNU-stack","", at progbits
        .addrsig

This behavior causes linker errors with LLD.

[1] https://clang.llvm.org/docs/UsersManual.html#microsoft-extensions

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