Make windres output in res format instead of in coff

This makes the output architecture independent, allowing
the x86_64 GNU binutils binary to be used for other
architectures as well, including arm/arm64 which aren't supported
by binutils.

Dockerfile

@@ -29,7 +29,7 @@ RUN ./install-wrappers.sh $TOOLCHAIN_PREFIX
 # llvm-rc isn't fully usable as a replacement for windres yet.
 RUN apt-get update -qq && \
     apt-get install -qqy binutils-mingw-w64-x86-64 && \
-    cp /usr/bin/x86_64-w64-mingw32-windres $TOOLCHAIN_PREFIX/bin && \
+    cp /usr/bin/x86_64-w64-mingw32-windres $TOOLCHAIN_PREFIX/bin/x86_64-w64-mingw32-windresreal && \
     apt-get remove -qqy binutils-mingw-w64-x86-64 && \
     cd $TOOLCHAIN_PREFIX/bin
 

README.md

@@ -48,6 +48,14 @@ a different version) - and likewise, if configure flags in the build-*.sh
 scripts have changed, you might need to wipe the build directory under
 each project for the new configure options to be taken into use.
 
+If building without the dockerfile, manually install a copy of normal
+GNU binutils windres with the name `x86_64-w64-mingw32-windresreal`.
+Wrappers named `<triplet>-windres` are installed that call this binary
+with the necessary options to make it output in the arch independent
+res format, allowing using it for all architectures, even those that
+GNU binutils don't support. (LLVM does provide a similar tool, llvm-rc,
+but it's not yet ready to actually replace windres in all cases.)
+
 
 
 Status

install-wrappers.sh

@@ -11,7 +11,7 @@ PREFIX="$1"
 : ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
 
 mkdir -p $PREFIX/bin
-cp wrappers/clang-target-wrapper.sh wrappers/objdump-wrapper.sh wrappers/ld-wrapper.sh $PREFIX/bin
+cp wrappers/clang-target-wrapper.sh wrappers/objdump-wrapper.sh wrappers/ld-wrapper.sh wrappers/windres-wrapper.sh $PREFIX/bin
 cd $PREFIX/bin
 for arch in $ARCHS; do
     for exec in clang clang++ gcc g++; do
@@ -23,7 +23,7 @@ for arch in $ARCHS; do
     for exec in strip; do
         ln -sf /bin/true $arch-w64-mingw32-$exec
     done
-    for exec in ld objdump; do
+    for exec in ld objdump windres; do
         ln -sf $exec-wrapper.sh $arch-w64-mingw32-$exec
     done
 done

wrappers/windres-wrapper.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+set -e
+x86_64-w64-mingw32-windresreal "$@" --output-format res