[gcc r13-7153] mingw: Support building with older gcc versions

[gcc r13-7153] mingw: Support building with older gcc versions

[Jonathan Yong]

https://gcc.gnu.org/g:3beeebd6934654f3453209730b98c7a1fd0305b6

commit r13-7153-g3beeebd6934654f3453209730b98c7a1fd0305b6
Author: Costas Argyris <costas.argyris@gmail.com>
Date:   Wed Apr 12 08:48:18 2023 +0100

    mingw: Support building with older gcc versions
    
    The $@ argument to the compiler is causing
    only a warning in some gcc versions but an
    error in others. In any case, $@ was never
    necessary so remove it completely, just like
    the rules in x-mingw32 where the object file
    gets named after the source file.
    
    This fixes both warnings and errors about
    sym-mingw32.o appearing in the command line
    unnecessarily.
    
    The -nostdlib flag is required along with -r
    for older gcc versions that don't apply it
    automatically with -r, resulting in main
    functions erroneously entering a partial link.
    
    Signed-off-by: Jonathan Yong <10walls@gmail.com>
    
    gcc/ChangeLog:
    
            * config/i386/x-mingw32-utf8: Remove extrataneous $@

Diff:
---
 gcc/config/i386/x-mingw32-utf8 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/config/i386/x-mingw32-utf8 b/gcc/config/i386/x-mingw32-utf8
index 2783dd259a6..b5a6cfcf702 100644
--- a/gcc/config/i386/x-mingw32-utf8
+++ b/gcc/config/i386/x-mingw32-utf8
@@ -34,7 +34,7 @@ utf8rc-mingw32.o : $(srcdir)/config/i386/utf8-mingw32.rc \
 # Create an object file that just exports the global symbol
 # HOST_EXTRA_OBJS_SYMBOL
 sym-mingw32.o : $(srcdir)/config/i386/sym-mingw32.cc
-	$(COMPILER) -c $< $@
+	$(COMPILER) -c $<
 
 # Combine the two object files into one which has both the
 # compiled utf8 resource and the HOST_EXTRA_OBJS_SYMBOL symbol.
@@ -44,8 +44,10 @@ sym-mingw32.o : $(srcdir)/config/i386/sym-mingw32.cc
 # If nothing references it into libbackend.a, it will not
 # get linked into the compiler proper eventually.
 # Therefore we need to request the symbol at compiler link time.
+# -nostdlib is required for supporting old gcc versions that
+# don't apply it automatically with -r.
 utf8-mingw32.o : utf8rc-mingw32.o sym-mingw32.o
-	$(COMPILER) -r utf8rc-mingw32.o sym-mingw32.o -o $@
+	$(COMPILER) -r -nostdlib utf8rc-mingw32.o sym-mingw32.o -o $@
 
 # Force compilers to link against the utf8 resource by
 # requiring the symbol to be defined.