[Bug macros/29063] Handle macinfo section and tags

["simon.marchi at polymtl dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29063

Simon Marchi <simon.marchi at polymtl dot ca> changed:

           What    |Removed                     |Added
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                 CC|                            |simon.marchi at polymtl dot ca

--- Comment #1 from Simon Marchi <simon.marchi at polymtl dot ca> ---
GDB does handle them, it's just that the DW_MACINFO_* defines happen to have
the same value has the DW_MACRO_* ones, and GDB only lists the DW_MACRO_* ones
in its switch-cases.

Which version of clang are you using?  And which linker/version are you using? 
The linker version affects the generation of the line header table, which is
used by GDB to create macro_source_file, so the linker has an influence here.

With clang 13 and ld 2.34 (which clang uses by default on my Ubuntu 20.04), I
get:

$ make check TESTS="gdb.base/macscp.exp" RUNTESTFLAGS="CC_FOR_TARGET=clang-13"
...
FAIL: gdb.base/macscp.exp: info macro FROM_COMMANDLINE

                === gdb Summary ===

# of expected passes            319
# of unexpected failures        1
# of known failures             19

The failure is due to this:

https://sourceware.org/bugzilla/show_bug.cgi?id=29034

If you see more failures, there must be something else.  I'd be curious to
know, because I'm currently working on fixing macro printing for various cases
of binaries compiled with both gcc and clang.

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