[gcc r13-6842] Fix native MSYS2 build failure [PR108865, PR109188]

[gcc r13-6842] Fix native MSYS2 build failure [PR108865, PR109188]

[Jonathan Yong]

https://gcc.gnu.org/g:08ef17c75777ef9e4e7ead132ccd7a6d03ae6020

commit r13-6842-g08ef17c75777ef9e4e7ead132ccd7a6d03ae6020
Author: Costas Argyris <costas.argyris@gmail.com>
Date:   Wed Mar 22 10:28:08 2023 +0000

    Fix native MSYS2 build failure [PR108865, PR109188]
    
    Don't cause an error if the symbol is not found.
    
    When building natively as an MSYS2 package, some
    executables are borrowing the $(COMPILERS) flags
    and --require-defined=HOST_EXTRA_OBJS_SYMBOL is
    causing them to fail.
    
    These executables don't need that symbol, so make
    it optional such that they don't error out.
    
    The compilers will still look for it (and find it)
    with the desired effect of getting UTF-8 support.
    
            PR/PR108865
    
    gcc/ChangeLog:
    
            * config/i386/x-mingw32-utf8: Make HOST_EXTRA_OBJS_SYMBOL
            optional.
    
    Signed-off-by: Jonathan Yong <10walls@gmail.com>

Diff:
---
 gcc/config/i386/x-mingw32-utf8 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/i386/x-mingw32-utf8 b/gcc/config/i386/x-mingw32-utf8
index 6161dc23547..9de963d7965 100644
--- a/gcc/config/i386/x-mingw32-utf8
+++ b/gcc/config/i386/x-mingw32-utf8
@@ -53,4 +53,4 @@ utf8-mingw32.o : utf8rc-mingw32.o sym-mingw32.o
 # This is expected because the resource object is not supposed
 # to have any symbols, it just has to be linked into the
 # executable in order for Windows to use the utf8 code page.
-$(COMPILERS) : override LDFLAGS += -Wl,--require-defined=HOST_EXTRA_OBJS_SYMBOL
+$(COMPILERS) : override LDFLAGS += -Wl,--undefined=HOST_EXTRA_OBJS_SYMBOL