From 83f3cdc6a4e1033fb0f16f418c4b698b3030e29a Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Tue, 24 Jul 2018 15:49:29 +0000
Subject: [PATCH] [CMake] Fix the setting of LIBCXX_HEADER_DIR in standalone
 build

This is an alternative approach to r337727 which broke the build
because libc++ headers were copied into the location outside of
directories used by Clang. This change sets LIBCXX_HEADER_DIR to
different values depending on whether libc++ is being built as
part of LLVM w/ per-target multiarch runtime, LLVM or standalone.

Differential Revision: https://reviews.llvm.org/D49711

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@337833 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt                      |  3 ++-
 cmake/Modules/HandleLibCXXABI.cmake | 14 ++++++++------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index df59b5610..549be42e2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -386,7 +386,6 @@ endif ()
 set(LIBCXX_COMPILER    ${CMAKE_CXX_COMPILER})
 set(LIBCXX_SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
 set(LIBCXX_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
-set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
 set(LIBCXX_BINARY_INCLUDE_DIR "${LIBCXX_BINARY_DIR}/include/c++build")
 
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
@@ -399,8 +398,10 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
   set(LIBCXX_HEADER_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION})
 elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+  set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
 else()
   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+  set(LIBCXX_HEADER_DIR  ${CMAKE_BINARY_DIR})
 endif()
 
 file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
index d837c3c37..54b1e1286 100644
--- a/cmake/Modules/HandleLibCXXABI.cmake
+++ b/cmake/Modules/HandleLibCXXABI.cmake
@@ -48,12 +48,14 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
             COMMENT "Copying C++ ABI header ${fpath}...")
         list(APPEND abilib_headers "${dst}")
 
-        set(dst "${LIBCXX_HEADER_DIR}/include/c++/v1/${dstdir}/${fpath}")
-        add_custom_command(OUTPUT ${dst}
-            DEPENDS ${src}
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
-            COMMENT "Copying C++ ABI header ${fpath}...")
-        list(APPEND abilib_headers "${dst}")
+        if (NOT LIBCXX_USING_INSTALLED_LLVM)
+          set(dst "${LIBCXX_HEADER_DIR}/include/c++/v1/${dstdir}/${fpath}")
+          add_custom_command(OUTPUT ${dst}
+              DEPENDS ${src}
+              COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
+              COMMENT "Copying C++ ABI header ${fpath}...")
+          list(APPEND abilib_headers "${dst}")
+        endif()
 
         if (LIBCXX_INSTALL_HEADERS)
           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"