riscv64-unknown-elf-newlib: enable clang64

mingw-w64-riscv64-unknown-elf-newlib/PKGBUILD

@@ -2,6 +2,9 @@
 # Based on mingw-w64-arm-none-eabi-newlib
 
 _bootstrap=0
+if [[ ${MINGW_PACKAGE_PREFIX} == *-clang-* ]]; then
+  _bootstrap=1
+fi
 
 _realname=newlib
 _target=riscv64-unknown-elf
@@ -13,13 +16,17 @@ pkgver=4.2.0.20211231
 pkgrel=2
 pkgdesc='GNU Tools for RISC-V Embedded Processors - Newlib (mingw-w64)'
 arch=('any')
-mingw_arch=('mingw32' 'mingw64' 'ucrt64')
+mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64')
 url="https://sourceware.org/newlib/"
 license=('Various')
 groups=("${MINGW_PACKAGE_PREFIX}-${_target}-toolchain")
 depends=("${MINGW_PACKAGE_PREFIX}-${_target}-binutils")
 makedepends=("${MINGW_PACKAGE_PREFIX}-autotools"
              "${MINGW_PACKAGE_PREFIX}-cc"
+             "${MINGW_PACKAGE_PREFIX}-gmp"
+             "${MINGW_PACKAGE_PREFIX}-mpc"
+             "${MINGW_PACKAGE_PREFIX}-mpfr"
+             "${MINGW_PACKAGE_PREFIX}-isl"
              $( (( _bootstrap )) || echo "${MINGW_PACKAGE_PREFIX}-${_target}-gcc"))
 options=('staticlibs' '!strip' '!emptydirs')
 source=(
@@ -54,6 +61,11 @@ _build_gcc() {
 
     cp -a ${MINGW_PREFIX}/${_target} ${srcdir}/gcc-${_gccver}/gcc-install-${MSYSTEM}
 
+    if [[ ${MINGW_PACKAGE_PREFIX} == *-clang-* ]]; then
+        CFLAGS+=" -Wno-int-conversion -Wno-array-bounds -Wno-mismatched-tags"
+        CXXFLAGS+=" -Wno-int-conversion -Wno-array-bounds -Wno-mismatched-tags"
+    fi
+
     local _GCC_LDFLAGS="${LDFLAGS} -Wl,--disable-dynamicbase"
     if [ "${CARCH}" = 'x86_64' ]; then
         _GCC_LDFLAGS+=",--image-base=0x400000"
@@ -83,7 +95,6 @@ _build_gcc() {
         --without-headers \
         --with-libelf \
         --with-newlib \
-        --enable-multilib \
         --with-host-libstdcxx="-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm" \
         --with-sysroot=${MINGW_PREFIX} \
         --with-build-sysroot=${srcdir}/gcc-${_gccver}/gcc-install-${MSYSTEM} \