bug#69689: 30.0.50; cannot native compile with -flto in native-comp-compiler-options

[Eli Zaretskii <eliz@gnu.org>]

> From: StrawberryTea <look@strawberrytea.xyz>
> Date: Sat, 09 Mar 2024 21:19:57 -0600
> 
> Hello Emacs developers,
> 
> I am trying to native compile Emacs with the -flto flag patched into the
> native-comp-compiler-options variable. However, when I do this, I get
> the following error:
> 
> /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: /var/tmp/portage/app-editors/emacs-30.0.9999/temp/ccW8pLE7.o: plugin needed to handle lto object
> /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: /var/tmp/portage/app-editors/emacs-30.0.9999/temp/ccW8pLE7.o: plugin needed to handle lto object
> lto1: internal compiler error: original not compressed with zstd
> 0x11b434d internal_error(char const*, ...)
>     ???:0
> 0x128df56 cgraph_node::get_untransformed_body()
>     ???:0
> 0x128d4c3 cgraph_node::expand()
>     ???:0
> 0x19c264f symbol_table::compile()
>     ???:0
> 0x19b6f50 lto_main()
>     ???:0
> Please submit a full bug report, with preprocessed source (by using -freport-bug).
> Please include the complete backtrace with any bug report.
> See <https://bugs.gentoo.org/> for instructions.
> make[4]: *** [/var/tmp/portage/app-editors/emacs-30.0.9999/temp/ccZwblRQ.mk:2: /var/tmp/portage/app-editors/emacs-30.0.9999/temp/ccq4BEJb.ltrans0.ltrans.o] Error 1
> lto-wrapper: fatal error: make returned 2 exit status
> compilation terminated.
> collect2: fatal error: lto-wrapper returned 1 exit status
> compilation terminated.
> libgccjit.so: error: error invoking gcc driver

Why do you think this is an Emacs problem?  The error messages seem to
imply the problem is with your installation of libgccjit or
GCC/Binutils in general.  The request to submit a bug report cites a
Gentoo bug address, so I think you should report it there first.

Paul, does Emacs even support -flto builds?