[gcc r13-6890] Extend UTF-8 support to the 32-bit mingw host.

[gcc r13-6890] Extend UTF-8 support to the 32-bit mingw host.

[Jonathan Yong]

https://gcc.gnu.org/g:304c7d44a2212e6fd618587331cea2c266dc10bf

commit r13-6890-g304c7d44a2212e6fd618587331cea2c266dc10bf
Author: Costas Argyris <costas.argyris@gmail.com>
Date:   Sun Mar 26 11:32:13 2023 +0100

    Extend UTF-8 support to the 32-bit mingw host.
    
    Prevent any name mangling in HOST_EXTRA_OBJS_SYMBOL
    such that the linker always finds it by that name.
    
    Also add the .manifest file as an explicit
    dependency in the make rule such that the
    object gets re-built if it changes.
    
    gcc/ChangeLog:
    
            * config.host: Pull in i386/x-mingw32-utf8 Makefile
            fragment and reference utf8rc-mingw32.o explicitly
            for mingw hosts.
            * config/i386/sym-mingw32.cc: prevent name mangling of
            stub symbol.
            * config/i386/x-mingw32-utf8: Make utf8rc-mingw32.o
            depend on manifest file explicitly.
    
    Signed-off-by: Jonathan Yong <10walls@gmail.com>

Diff:
---
 gcc/config.host                | 5 +++--
 gcc/config/i386/sym-mingw32.cc | 4 +++-
 gcc/config/i386/x-mingw32-utf8 | 3 ++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/gcc/config.host b/gcc/config.host
index 4abb32ad73d..5df85752ed4 100644
--- a/gcc/config.host
+++ b/gcc/config.host
@@ -232,10 +232,11 @@ case ${host} in
     ;;
   i[34567]86-*-mingw32*)
     host_xm_file=i386/xm-mingw32.h
-    host_xmake_file="${host_xmake_file} i386/x-mingw32"
+    host_xmake_file="${host_xmake_file} i386/x-mingw32 i386/x-mingw32-utf8"
     host_exeext=.exe
     out_host_hook_obj=host-mingw32.o
-    host_extra_gcc_objs="${host_extra_gcc_objs} driver-mingw32.o"
+    host_extra_objs="${host_extra_objs} utf8-mingw32.o"
+    host_extra_gcc_objs="${host_extra_gcc_objs} driver-mingw32.o utf8rc-mingw32.o"
     host_lto_plugin_soname=liblto_plugin.dll
     ;;
   x86_64-*-mingw*)
diff --git a/gcc/config/i386/sym-mingw32.cc b/gcc/config/i386/sym-mingw32.cc
index f369698abc4..2f8dee6c1ec 100644
--- a/gcc/config/i386/sym-mingw32.cc
+++ b/gcc/config/i386/sym-mingw32.cc
@@ -1 +1,3 @@
-char HOST_EXTRA_OBJS_SYMBOL;
+/* Prevent any name mangling to make sure that the linker
+   will always find the symbol. */
+char HOST_EXTRA_OBJS_SYMBOL asm ("HOST_EXTRA_OBJS_SYMBOL");
diff --git a/gcc/config/i386/x-mingw32-utf8 b/gcc/config/i386/x-mingw32-utf8
index 9de963d7965..cf5c3db3d8b 100644
--- a/gcc/config/i386/x-mingw32-utf8
+++ b/gcc/config/i386/x-mingw32-utf8
@@ -27,7 +27,8 @@
 # The resulting .o file gets added to host_extra_gcc_objs in
 # config.host for x86_64-*-mingw* host and gets linked into
 # the driver as a .o file, so it's lack of symbols is OK.
-utf8rc-mingw32.o : $(srcdir)/config/i386/utf8-mingw32.rc
+utf8rc-mingw32.o : $(srcdir)/config/i386/utf8-mingw32.rc \
+  $(srcdir)/config/i386/winnt-utf8.manifest
 	$(WINDRES) $< $@
 
 # Create an object file that just exports the global symbol