How do I enable -flto for Emacs nativecomp?

[StrawberryTea <look@strawberrytea.xyz>]

Hello libgccjit people,

I'm trying to enable -flto for Emacs nativecomp. I have the following
Emacs patch I am applying through Gentoo

diff --git a/lisp/emacs-lisp/comp.el b/lisp/emacs-lisp/comp.el
index bb4552459dd..745612838cc 100644
--- a/lisp/emacs-lisp/comp.el
+++ b/lisp/emacs-lisp/comp.el
@@ -193,8 +193,8 @@ native-comp-async-query-on-exit
   :type 'boolean
   :version "28.1")

-(defcustom native-comp-compiler-options nil
+(defcustom native-comp-compiler-options '("-march=znver4" "-Ofast" "-g0" "-fno-finite-math-only" "-flto")
   "Command line options passed verbatim to GCC compiler.
 Note that not all options are meaningful and some options might even
 break your Emacs.  Use at your own risk.
 affecting the assembler and linker are likely to be useful.

However, Emacs fails to compile with the following error:
libgccjit.so: error: LTO support has not been enabled in this configuration
Assembler messages:
Error: can't open /var/tmp/portage/app-editors/emacs-30.0.9999/temp/libgccjit-1Escx1/fake.s for reading: No such file or directory
libgccjit.so: error: error invoking gcc driver

This is a link to the entire build log: https://0x0.st/H7h2.txt
And this is one for the build environment: https://0x0.st/H7hL.txt
And this is the output of gcc --version --verbose: https://0x0.st/H7hp.txt

I can pass options to the compiler and to the driver but I am not sure
what else to pass to enable LTO or if I need to recompile GCC, etc, etc.

Sincerely,
StrawberryTea