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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/29034] New: Can't print macros defined on the command-line
 with binaries built with clang
Date: Thu, 07 Apr 2022 00:54:42 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29034

            Bug ID: 29034
           Summary: Can't print macros defined on the command-line with
                    binaries built with clang
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

With a gcc-compiled binary, I can print a macro defined on the command line:

  $ gcc test.c -g3 -O0 -DONE=3D1
  $ ./gdb -nx -q --data-directory=3Ddata-directory a.out -ex start -ex "p O=
NE"
-batch
  ...
  $1 =3D 1

Not with clang:

    $ clang --version
clang version 13.0.1
    $ clang test.c -g3 -O0 -fdebug-macro -DONE=3D1=20
    $ ./gdb -nx -q --data-directory=3Ddata-directory a.out -ex start -ex "p=
 ONE"
-batch
    ...
    No symbol "ONE" in current context.

I think this is due to the fact that clang puts the macros defined on the
command-line too late in the macro table, after the main file.  So they are=
 not
"in scope" when stopped somewhere in the main file or any file included by =
it
(so, anywhere really).

I opened this LLVM bug:

https://github.com/llvm/llvm-project/issues/54506

This bug is mostly to have a paper trail and be able to use a KFAIL in the
testsuite.

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