[Bug macros/29725] Dwarf 5 C macros not handled

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29725

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
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                 CC|                            |simark at simark dot ca

--- Comment #3 from Simon Marchi <simark at simark dot ca> ---
Thanks, I think I was able to reproduce.  Your instructions should probably
include CFLAGS="-g3" though?

So, I do this to reach the point in the code that you described:

$ /home/simark/build/binutils-gdb/gdb/gdb
--data-directory=/home/simark/build/binutils-gdb/gdb/data-directory -nx -q
./gawk -ex "b mk_binary" -ex "run -f test/divzero2.awk" -ex "advance 5539"

(gdb) info macro memory
The symbol `memory' has no definition as a C/C++ preprocessor macro
at /home/simark/src/gawk/awkgram.c:-1

This -1 line number is fishy.

Debugging gdb and breaking on macro_lookup_inclusion, and re-running "info
macro memory", I can see that we do this:

    if (filename_cmp (name, source->filename) == 0)
      return source;      

Ref:
https://gitlab.com/gnutools/binutils-gdb/-/blob/ecb58b32cdeb9789f9bc7c2037cb001d9a729f83/gdb/macrotab.c#L511

(top-gdb) p name
$1 = 0x621000136670 "/home/simark/src/gawk/awkgram.y"
(top-gdb) p source->filename
$2 = 0x621000136610 "/home/simark/src/gawk/awkgram.c"

So, GDB is getting confused because of the different source filenames.

Did this really work previously, using DWARF 4 and an older GDB?

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