[gcc r13-6904] mingw: Fix comments in x-mingw32-utf8

[gcc r13-6904] mingw: Fix comments in x-mingw32-utf8

[Jonathan Yong]

https://gcc.gnu.org/g:e70e36cbef4f01e7d32bafe17698c3bf3e4624b8

commit r13-6904-ge70e36cbef4f01e7d32bafe17698c3bf3e4624b8
Author: Costas Argyris <costas.argyris@gmail.com>
Date:   Tue Mar 28 11:29:06 2023 +0100

    mingw: Fix comments in x-mingw32-utf8
    
    This is a comment-only change that I should have
    done with the previous commit (304c7d44a) but
    forgot to do so.
    
    gcc/ChangeLog:
    
            * config/i386/x-mingw32-utf8: update comments.
    
    Signed-off-by: Jonathan Yong <10walls@gmail.com>

Diff:
---
 gcc/config/i386/x-mingw32-utf8 | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/gcc/config/i386/x-mingw32-utf8 b/gcc/config/i386/x-mingw32-utf8
index cf5c3db3d8b..2783dd259a6 100644
--- a/gcc/config/i386/x-mingw32-utf8
+++ b/gcc/config/i386/x-mingw32-utf8
@@ -17,15 +17,15 @@
 # <http://www.gnu.org/licenses/>.
 #
 #
-# For 64-bit Windows host, embed a manifest that sets the active
+# For mingw Windows hosts, embed a manifest that sets the active
 # code page of the driver and compiler proper processes to utf8.
-# This only has an effect on Windows version 1903 (May 2019 Update)
-# or later.
+# This only has an effect when gcc is hosted on Windows version
+# 1903 (May 2019 Update) or later.
 
 # The resource .rc file references the utf8 .manifest file.
 # Compile it into an object file using windres.
 # The resulting .o file gets added to host_extra_gcc_objs in
-# config.host for x86_64-*-mingw* host and gets linked into
+# config.host for mingw hosts 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 \
   $(srcdir)/config/i386/winnt-utf8.manifest
@@ -39,7 +39,7 @@ sym-mingw32.o : $(srcdir)/config/i386/sym-mingw32.cc
 # Combine the two object files into one which has both the
 # compiled utf8 resource and the HOST_EXTRA_OBJS_SYMBOL symbol.
 # The resulting .o file gets added to host_extra_objs in
-# config.host for x86_64-*-mingw* host and gets archived into
+# config.host for mingw hosts and gets archived into
 # libbackend.a which gets linked into the compiler proper.
 # If nothing references it into libbackend.a, it will not
 # get linked into the compiler proper eventually.
@@ -54,4 +54,8 @@ 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.
+# Some build environments are passing these flags to other
+# programs as well, so make the symbol definition optional
+# such that these programs don't fail to build when they
+# don't find it.
 $(COMPILERS) : override LDFLAGS += -Wl,--undefined=HOST_EXTRA_OBJS_SYMBOL