From: Richard Purdie <richard.purdie@linuxfoundation.org>
Subject: [PATCH 11/12] ltmain.in: Handle prefix-map compiler options correctly

If lto is enabled, we need the prefix-map variables to be passed to the linker.
Add these to the list of options libtool passes through.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Upstream-Status: Submitted [https://lists.gnu.org/archive/html/libtool-patches/2021-10/msg00019.html]

Index: libtool-2.4.7/build-aux/ltmain.in
===================================================================
--- libtool-2.4.7.orig/build-aux/ltmain.in
+++ libtool-2.4.7/build-aux/ltmain.in
@@ -5419,11 +5419,12 @@ func_mode_link ()
       # -stdlib=*            select c++ std lib with clang
       # -fsanitize=*         Clang/GCC memory and address sanitizer
       # -fuse-ld=*           Linker select flags for GCC
+      # -f*-prefix-map*      needed for lto linking
       # -Wa,*                Pass flags directly to the assembler
       -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=*|-Wa,*)
+      -specs=*|-fsanitize=*|-fuse-ld=*|-f*-prefix-map*|-Wa,*)
         func_quote_arg pretty "$arg"
 	arg=$func_quote_arg_result
         func_append compile_command " $arg"