[PATCH] mingw: Support building with older gcc versions

[Costas Argyris <costas.argyris@gmail.com>]

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This is proposed to fix PR109460 where an older version of
gcc (7.3) was used to build for windows (mingw) host.

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From e5b608072f80a83cca65e88bb75ecc62ab0bbb87 Mon Sep 17 00:00:00 2001
From: Costas Argyris <costas.argyris@gmail.com>
Date: Wed, 12 Apr 2023 08:48:18 +0100
Subject: [PATCH] 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.
---
 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.
-- 
2.30.2