[cmake] Handle CROSS_TOOLCHAIN_FLAGS_NATIVE internally (#2358)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9db846c..d9d802d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -164,7 +164,21 @@
# Set the host build directory for LLVM to our directory. Otherwise it will
# follow its own convention.
- set(LLVM_NATIVE_BUILD "${IREE_HOST_BINARY_ROOT}/third_party/llvm-project/llvm")
+ set(LLVM_NATIVE_BUILD
+ "${IREE_HOST_BINARY_ROOT}/third_party/llvm-project/llvm"
+ CACHE FILEPATH "directory containing host artifacts for LLVM"
+ )
+
+ # And set host C/C++ compiler for LLVM. This makes cross compilation using
+ # Windows as the host platform nicer. Because we have various development
+ # evnironments on Windows (CMD, Cygwin, MSYS, etc.), LLVM can have problems
+ # figuring out the host triple and toolchain. We are passing in the host
+ # C/C++ compiler toolchain for IREE anyway; so we can give LLVM side some
+ # help here. This hides some complexity and ugliness from the users.
+ set(CROSS_TOOLCHAIN_FLAGS_NATIVE
+ "-DCMAKE_C_COMPILER=\"${IREE_HOST_C_COMPILER}\";-DCMAKE_CXX_COMPILER=\"${IREE_HOST_CXX_COMPILER}\""
+ CACHE FILEPATH "LLVM toolchain configuration for host build"
+ )
include(iree_cross_compile)
