[llvm-bugs] [Bug 36995] New: Improve LLD's error message for MSVC's LTCG object files

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36995

            Bug ID: 36995
           Summary: Improve LLD's error message for MSVC's LTCG object
                    files
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: COFF
          Assignee: unassignedbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvm-bugs at lists.llvm.org, ruiu at google.com,
                    zturner at google.com

We correctly reject these files because they have the wrong magic. That was
https://bugs.llvm.org/show_bug.cgi?id=31372.

However, the error message could be improved:
[4/4] LIB obj/base/base_static.lib
FAILED: obj/base/base_static.lib
...
obj/base/base_static/base_switches.obj: not a COFF object, bitcode or resource
file
..\..\third_party\llvm-build\Release+Asserts\bin\lld-link.exe: error: lib
failed
ninja: build stopped: subcommand failed.

It would be nice to proactively detect that this is an LTCG file and tell the
user to rebuild without /GL.

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