[Bug debug/70599] Crash when adding debug symbols to a program making heavy use of nested templates.

["ambrop7 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70599

Ambroz Bizjak <ambrop7 at gmail dot com> changed:

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                 CC|                            |ambrop7 at gmail dot com

--- Comment #4 from Ambroz Bizjak <ambrop7 at gmail dot com> ---
Hi,
(I'm the author of Aprinter)
I find that with -g1 instead of -g, the compile works fine. I've managed to
refactor the code so that gcc compiles it with -g, using up to 8.5 GiB. The
resulting .elf file is 627M (with -g1 16M, without -g 437K).

It takes gdb about a minute to load the full file, and memory use of gdb grows
to gigabytes.

I suspect that the issue with -g is that gcc includes ALL types in the output,
including types used only for metaprogramming. Probably for every list like
Cons<1, Cons<2, Cons<3>>> there will be a quadratic explosion all constituent
lists are included as symbols in the output, which is very bad for non-trivial
lists.

Clang manages to compile the same thing (with -g) using 1GiB RAM and results in
a 181M .elf output.