Update RISC-V crosscompile instructions (#7270)
Set the host build compiler to clang. It should be a no-op for CI since
the docker image already set the {CC, CXX} environment variables to clang.diff --git a/build_tools/cmake/build_riscv.sh b/build_tools/cmake/build_riscv.sh
index cff3227..bf085ac 100755
--- a/build_tools/cmake/build_riscv.sh
+++ b/build_tools/cmake/build_riscv.sh
@@ -38,6 +38,8 @@
# Configure, build, install.
"${CMAKE_BIN?}" -G Ninja -B "${BUILD_HOST_DIR?}" \
-DCMAKE_INSTALL_PREFIX="${BUILD_HOST_DIR?}/install" \
+ -DCMAKE_C_COMPILER=clang \
+ -DCMAKE_CXX_COMPILER=clang++ \
-DIREE_BUILD_COMPILER=ON \
-DIREE_BUILD_TESTS=OFF \
-DIREE_BUILD_SAMPLES=OFF \
diff --git a/docs/website/docs/building-from-source/riscv.md b/docs/website/docs/building-from-source/riscv.md
index c8d06e4..7f9e23c 100644
--- a/docs/website/docs/building-from-source/riscv.md
+++ b/docs/website/docs/building-from-source/riscv.md
@@ -56,6 +56,8 @@
``` shell
cmake -GNinja -B ../iree-build/ \
+ -DCMAKE_C_COMPILER=clang \
+ -DCMAKE_CXX_COMPILER=clang++ \
-DCMAKE_INSTALL_PREFIX=../iree-build/install \
-DCMAKE_BUILD_TYPE=RelWithDebInfo \
.
