[compiler-rt] r351117 - [compiler-rt] Add option to disable libc++ build

[Shoaib Meenai via llvm-commits]

Author: smeenai
Date: Mon Jan 14 12:33:30 2019
New Revision: 351117

URL: http://llvm.org/viewvc/llvm-project?rev=351117&view=rev
Log:
[compiler-rt] Add option to disable libc++ build

Having libc++ checked out doesn't necessarily mean it should be built;
for example, the same source tree might be used for multiple build
configurations, and libc++ might not build in some of those
configurations. Add an option to compiler-rt's build to disable building
libc++. This defaults to ON, so it shouldn't change any existing build
configurations.

Differential Revision: https://reviews.llvm.org/D56479

Modified:
    compiler-rt/trunk/CMakeLists.txt

Modified: compiler-rt/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/CMakeLists.txt?rev=351117&r1=351116&r2=351117&view=diff
==============================================================================
--- compiler-rt/trunk/CMakeLists.txt (original)
+++ compiler-rt/trunk/CMakeLists.txt Mon Jan 14 12:33:30 2019
@@ -428,15 +428,19 @@ endif()
 
 add_subdirectory(include)
 
-foreach(path IN ITEMS ${LLVM_MAIN_SRC_DIR}/projects/libcxx
-                      ${LLVM_MAIN_SRC_DIR}/runtimes/libcxx
-                      ${LLVM_MAIN_SRC_DIR}/../libcxx
-                      ${LLVM_EXTERNAL_LIBCXX_SOURCE_DIR})
-  if(IS_DIRECTORY ${path})
-    set(COMPILER_RT_LIBCXX_PATH ${path})
-    break()
-  endif()
-endforeach()
+option(COMPILER_RT_USE_LIBCXX
+  "Enable compiler-rt to use libc++ from the source tree" ON)
+if(COMPILER_RT_USE_LIBCXX)
+  foreach(path IN ITEMS ${LLVM_MAIN_SRC_DIR}/projects/libcxx
+                        ${LLVM_MAIN_SRC_DIR}/runtimes/libcxx
+                        ${LLVM_MAIN_SRC_DIR}/../libcxx
+                        ${LLVM_EXTERNAL_LIBCXX_SOURCE_DIR})
+    if(IS_DIRECTORY ${path})
+      set(COMPILER_RT_LIBCXX_PATH ${path})
+      break()
+    endif()
+  endforeach()
+endif()
 
 set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/tools/lld)
 if(EXISTS ${COMPILER_RT_LLD_PATH}/ AND LLVM_TOOL_LLD_BUILD)