build libstdc++ too

os3-toolchain/build.sh

@@ -48,8 +48,12 @@ cd gcc-x86_64-os3
 rm -rf build
 mkdir -p build
 cd build
-../gcc-13.2.0/configure --target=$TARGET --prefix="$PREFIX" --with-sysroot="$OS2_ROOT/sysroot" --disable-nls --enable-languages=c,c++ --with-newlib --enable-version-specific-runtime-libs --with-gmp=/opt/homebrew --with-mpc=/opt/homebrew --with-mpfr=/opt/homebrew
+../gcc-13.2.0/configure --target=$TARGET --prefix="$PREFIX" --with-sysroot="$OS2_ROOT/sysroot" --disable-nls \
+    --enable-languages=c,c++ --with-newlib --disable-libstdcxx-threads \
+    --enable-version-specific-runtime-libs --with-gmp=/opt/homebrew --with-mpc=/opt/homebrew --with-mpfr=/opt/homebrew
 make -j$(nproc) all-gcc
 make -j$(nproc) all-target-libgcc
+make -j$(nproc) all-target-libstdc++-v3
 make install-gcc
 make install-target-libgcc
+make install-target-libstdc++-v3

os3-toolchain/gcc-x86_64-os3/gcc-13.2.0/gcc/config.gcc

@@ -1133,6 +1133,7 @@ esac
 
 case ${target} in
 x86_64-*-os3*)
+    tmake_file="${tmake_file} i386/t-x86_64-os3"
     tm_file="${tm_file} i386/unix.h i386/att.h elfos.h glibc-stdint.h i386/i386elf.h i386/x86-64.h os3.h"
     ;;
 aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)

os3-toolchain/gcc-x86_64-os3/gcc-13.2.0/gcc/config/i386/t-x86_64-os3

@@ -0,0 +1,3 @@
+# Add libgcc multilib variant without red-zone requirement
+ 
+MULTILIB_OPTIONS += mno-red-zone mcmodel=large