Improve the messages output by unsupported options when using --elf-output-style=GNU

[gbreynoo]

Bugzilla Link	51952
Version	trunk
OS	Windows NT
CC	@jh7370

Extended Description

A number of options supported by --elf-output-style=LLVM are not implemented for GNU output style, a message is output in these cases which is not too useful for the user. For example use of --elf-linker-options prints:

"printELFLinkerOptions not implemented!"

This is the name of the function. A description of the command line option or missing functionality would be clearer.

Other examples are seen in printCGProfile() and printBBAddrMaps().

[kazuminn]

I want to do this issue.

[EugeneZelenko]

@kazuminn: just assign yourself.

[kazuminn]

@EugeneZelenko Why? I can't assign myself.

[llvmbot]

Hi!

This issue may be a good introductory issue for people new to working on LLVM. If you would like to work on this issue, your first steps are:

1. Assign the issue to you.
2. Fix the issue locally.
3. Run the test suite locally.
   3.1) Remember that the subdirectories under test/ create fine-grained testing targets, so you can
   e.g. use make check-clang-ast to only run Clang's AST tests.
4. Create a git commit
5. Run git clang-format HEAD~1 to format your changes.
6. Submit the patch to Phabricator.
   6.1) Detailed instructions can be found here

For more instructions on how to submit a patch to LLVM, see our documentation.

If you have any further questions about this issue, don't hesitate to ask via a comment on this Github issue.

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