From: Mehdi Amini <mehdi.amini@apple.com>
Date: Fri, 11 Nov 2016 04:27:59 +0000 (+0000)
Subject: CMake: make LLVM_OPTIMIZED_TABLEGEN friendly with LLVM_EXTERNAL_CLANG_SOURCE_DIR
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=90ab4b2ee258f6437f0bea77db22fcb86d5c66d9;p=llvm

CMake: make LLVM_OPTIMIZED_TABLEGEN friendly with LLVM_EXTERNAL_CLANG_SOURCE_DIR

This is need because of clang-tblgen

Differential Revision: https://reviews.llvm.org/D26483

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286560 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/cmake/modules/CrossCompile.cmake b/cmake/modules/CrossCompile.cmake
index 9c598a6a07b..b0726ebd4de 100644
--- a/cmake/modules/CrossCompile.cmake
+++ b/cmake/modules/CrossCompile.cmake
@@ -41,10 +41,15 @@ function(llvm_create_cross_target_internal target_name toolchain buildtype)
     if (buildtype)
       set(build_type_flags "-DCMAKE_BUILD_TYPE=${buildtype}")
     endif()
+	if (LLVM_EXTERNAL_CLANG_SOURCE_DIR)
+	  # Propagate LLVM_EXTERNAL_CLANG_SOURCE_DIR so that clang-tblgen can be built
+	  set(external_clang_dir "-DLLVM_EXTERNAL_CLANG_SOURCE_DIR=${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
+	endif()
     execute_process(COMMAND ${CMAKE_COMMAND} ${build_type_flags}
         -G "${CMAKE_GENERATOR}" -DLLVM_TARGETS_TO_BUILD=${LLVM_TARGETS_TO_BUILD}
         ${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_SOURCE_DIR}
         -DLLVM_TARGET_IS_CROSSCOMPILE_HOST=TRUE
+        ${external_clang_dir}
       WORKING_DIRECTORY ${LLVM_${target_name}_BUILD} )
   endif(NOT IS_DIRECTORY ${LLVM_${target_name}_BUILD})