From fefe1b3cfde0d03deb474e14f9c560cc0f8588b6 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka@google.com>
Date: Wed, 28 Aug 2019 02:41:14 +0000
Subject: [compiler-rt] Don't use libcxx if it's not enabled by
 LLVM_ENABLE_PROJECTS

This fixes sanitizer-x86_64-linux-fuzzer which switched to new layout and not it
can't link as libcxx is always there.
We should support and tests libcxx but still it was unexpected that libfuzzer
ignored LLVM_ENABLE_PROJECTS_USED.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@370153 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt | 42 ++++++++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d28fd20d5..50d0eb0ed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -463,24 +463,30 @@ add_subdirectory(include)
 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()
-  foreach(path IN ITEMS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi
-                        ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi
-                        ${LLVM_MAIN_SRC_DIR}/../libcxxabi
-                        ${LLVM_EXTERNAL_LIBCXXABI_SOURCE_DIR})
-    if(IS_DIRECTORY ${path})
-      set(COMPILER_RT_LIBCXXABI_PATH ${path})
-      break()
-    endif()
-  endforeach()
+  if(LLVM_ENABLE_PROJECTS_USED)
+    # Don't use libcxx if LLVM_ENABLE_PROJECTS does not enable it.
+    set(COMPILER_RT_LIBCXX_PATH ${LLVM_EXTERNAL_LIBCXX_SOURCE_DIR})
+    set(COMPILER_RT_LIBCXXABI_PATH ${LLVM_EXTERNAL_LIBCXXABI_SOURCE_DIR})
+  else()
+    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()
+    foreach(path IN ITEMS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi
+                          ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi
+                          ${LLVM_MAIN_SRC_DIR}/../libcxxabi
+                          ${LLVM_EXTERNAL_LIBCXXABI_SOURCE_DIR})
+      if(IS_DIRECTORY ${path})
+        set(COMPILER_RT_LIBCXXABI_PATH ${path})
+        break()
+      endif()
+    endforeach()
+  endif()
 endif()
 
 set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/tools/lld)
-- 
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