[llvm-dev] Introducing debugger tuning for dbx

[Zheng CZ Chen via llvm-dev]

Hi，

As some of you may know [1]，we are working on AIX support. Part of the AIX support is debug support, supporting dbx as the consumer of clang DWARF information [2].

While the dbx team is also working on improving its dwarf support, there are limitations in foreseeable future. Also there are situations on AIX that end user may not get up to date debugger.

So we are considering doing some compatibly work in clang/llvm to help improving user experience.

There are some limitations in dbx we know so far:

• .dwstr section is not supported for now;
• column-info in the line table not supported for now;
• sub-optimal handling of unsupported dwarf tags. Eg: dbx support dwarf 3, but misbehaving with new DWARF 5 tags DW_LANG_C_plus_plus_14 [3].

As discussed with the reviewers in patch [3], we are considering introducing a new tuning debugger tuning option for dbx, -debugger-tuning=dbx [4], so that we can change some option
default on AIX for dbx to accommodate its limitations, eg; -gno-column-info.

Any thoughts about the direction here? Reviews and feedback to [3][4] are also appreciated.

[1]: https://lists.llvm.org/pipermail/llvm-dev/2019-February/130175.html
[2]: https://reviews.llvm.org/rGafa76fe67a42f6d40d83a4f7d0cb03373045f3f4
[3]: https://reviews.llvm.org/D99250
[4]: https://reviews.llvm.org/D99400

Thanks!

BRS//
Chen Zheng
Power Compiler Backend Developer

[Franz Fehringer via llvm-dev]

While i have no fruitful input regarding your question(s), just out of curiosity: What ist the state of affairs for lldb on AIX?

_______________________________________________
LLVM Developers mailing list
llvm...@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

[Adrian Prantl via llvm-dev]

A dbx debugger tuning option sounds like the appropriate solution here. I support this.

thanks,

adrian

[Jinsong Ji via llvm-dev]

Hi Franz:

There is currently no plan of supporting lldb on AIX as far as I know.


Best,

Jinsong Ji (纪金松), PhD.

XL/LLVM on Power Compiler Development
E-mail: j...@us.ibm.com

Franz Fehringer via llvm-dev ---03/26/2021 10:05:21 AM---While i have no fruitful input regarding your question(s), just out of curiosity: What ist the stat

[Franz Fehringer via llvm-dev]

Thats unfortunate but thx nevertheless.
But debugging clang generated executables with gdb should or will be possible (on AIX)?

[Jinsong Ji via llvm-dev]

Yes.
gdb v8.11 or later (eg: the one from AIX Toolbox https://www.ibm.com/support/pages/aix-toolbox-linux-applications-overview) should be able to debug them.

Best,

Jinsong Ji (纪金松), PhD.

XL/LLVM on Power Compiler Development
E-mail: j...@us.ibm.com

Franz Fehringer via llvm-dev ---03/26/2021 01:28:32 PM---Thats unfortunate but thx nevertheless. But debugging clang generated executables with gdb should or

[Franz Fehringer via llvm-dev]

Thx again