https://lists.gnu.org/archive/html/libtool-patches/2024-01/msg00029.html
https://git.savannah.gnu.org/cgit/libtool.git/commit/?id=533d816dea307ad78c4e7ba16dcdec4c285b0bc8

From 533d816dea307ad78c4e7ba16dcdec4c285b0bc8 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 14 Jan 2024 06:27:33 +0000
Subject: ltmain.in: Pass through -fdiagnostics-color, -frecord-gcc-switches

* -fdiagnostics-color: who doesn't like color? No reason to strip it. This
  makes the link phase stick out like a sore thumb if there's warnings emitted.

* -frecord-gcc-switches: we use it in Gentoo to check if a package respects
  *FLAGS. Note that we do not need to include -grecord-gcc-switches explicitly
  here as -g* is already whitelisted.

* build-aux/ltmain.in: Handle -fdiagnostics-color* & -frecord-gcc-switches.
--- ltmain.sh
+++ ltmain.sh
@@ -7304,7 +7304,8 @@
       -64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
       -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*|--sysroot=*| \
       -O*|-g*|-flto*|-fwhopr*|-fuse-linker-plugin|-fstack-protector*|-stdlib=*| \
-      -specs=*|-fsanitize=*|-fuse-ld=*|-static-*|-fcilkplus|-Werror|-Werror=*)
+      -specs=*|-fsanitize=*|-fuse-ld=*|-static-*|-fcilkplus|-Werror|-Werror=*| \
+      -fdiagnostics-color*|-frecord-gcc-switches)
         func_quote_for_eval "$arg"
 	arg=$func_quote_for_eval_result
         func_append compile_command " $arg"