From d4d9de362b6ac2aac67e557f819c57dcfe79e2fe Mon Sep 17 00:00:00 2001
From: Andrew Ng <andrew.ng@sony.com>
Date: Tue, 14 Dec 2021 14:34:44 +0000
Subject: [PATCH] [CMake] Support passing arguments to build tool for external
 projects

Add CMake variable LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS to allow
arguments to be passed to the native tool used in CMake --build
invocations for external projects.

Can be used to pass extra arguments for enhanced versions of build
tools, e.g. distributed build options.

Differential Revision: https://reviews.llvm.org/D115815
---
 llvm/CMakeLists.txt                               | 4 ++++
 llvm/cmake/modules/LLVMExternalProjectUtils.cmake | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index edc2c8cded9c..9548dfff0e2a 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -176,6 +176,10 @@ if(LLVM_CCACHE_BUILD)
   endif()
 endif()
 
+set(LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS "" CACHE STRING
+  "Optional arguments for the native tool used in CMake --build invocations for external projects.")
+mark_as_advanced(LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS)
+
 option(LLVM_DEPENDENCY_DEBUGGING "Dependency debugging mode to verify correctly expressed library dependencies (Darwin only)" OFF)
 
 # Some features of the LLVM build may be disallowed when dependency debugging is
diff --git a/llvm/cmake/modules/LLVMExternalProjectUtils.cmake b/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
index 5f19098614db..7c417b41cd34 100644
--- a/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
+++ b/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
@@ -11,8 +11,14 @@ function(llvm_ExternalProject_BuildCmd out_var target bin_dir)
     # Use special command for Makefiles to support parallelism.
     set(${out_var} "$(MAKE)" "-C" "${bin_dir}" "${target}" PARENT_SCOPE)
   else()
+    set(tool_args "${LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS}")
+    if(NOT tool_args STREQUAL "")
+      string(CONFIGURE "${tool_args}" tool_args @ONLY)
+      string(PREPEND tool_args "-- ")
+      separate_arguments(tool_args UNIX_COMMAND "${tool_args}")
+    endif()
     set(${out_var} ${CMAKE_COMMAND} --build ${bin_dir} --target ${target}
-                                    --config ${ARG_CONFIGURATION} PARENT_SCOPE)
+                                    --config ${ARG_CONFIGURATION} ${tool_args} PARENT_SCOPE)
   endif()
 endfunction()