From 7c8ac35f5584d1b4efd893caa46141fa3a2abacc Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Fri, 18 Sep 2015 19:59:51 +0000
Subject: [PATCH] Revert "[CMake] Refactoring and cleaning up clang symlink
 generation."

This reverts commit r248015, because it broke bots. I'll revise and recommit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@248025 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt                   |  8 ------
 tools/driver/CMakeLists.txt      | 36 ++++++++++++++++++++------
 tools/driver/clang_symlink.cmake | 43 ++++++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+), 15 deletions(-)
 create mode 100644 tools/driver/clang_symlink.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83a34ecfef..8b9025970a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -414,14 +414,6 @@ macro(add_clang_executable name)
   set_clang_windows_version_resource_properties(${name})
 endmacro(add_clang_executable)
 
-macro(add_clang_symlink name dest)
-  add_llvm_tool_symlink(${name} ${dest})
-  # Always generate install targets
-  if(LLVM_INSTALL_TOOLCHAIN_ONLY)
-    llvm_install_symlink(${name} ${dest})
-  endif()
-endmacro()
-
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 include_directories(BEFORE
diff --git a/tools/driver/CMakeLists.txt b/tools/driver/CMakeLists.txt
index c2cc539350..c966b0b6c5 100644
--- a/tools/driver/CMakeLists.txt
+++ b/tools/driver/CMakeLists.txt
@@ -51,6 +51,33 @@ endif()
 
 add_dependencies(clang clang-headers)
 
+if(UNIX)
+  set(CLANGXX_LINK_OR_COPY create_symlink)
+# Create a relative symlink
+  set(clang_binary "clang${CMAKE_EXECUTABLE_SUFFIX}")
+else()
+  set(CLANGXX_LINK_OR_COPY copy)
+  set(clang_binary "${LLVM_RUNTIME_OUTPUT_INTDIR}/clang${CMAKE_EXECUTABLE_SUFFIX}")
+endif()
+
+# Create the clang++ symlink in the build directory.
+set(clang_pp "${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++${CMAKE_EXECUTABLE_SUFFIX}")
+add_custom_command(TARGET clang POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E ${CLANGXX_LINK_OR_COPY} "${clang_binary}" "${clang_pp}"
+    WORKING_DIRECTORY "${LLVM_RUNTIME_OUTPUT_INTDIR}")
+
+set_property(DIRECTORY APPEND
+  PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${clang_pp})
+
+# Create the clang-cl symlink in the build directory.
+set(clang_cl "${LLVM_RUNTIME_OUTPUT_INTDIR}/clang-cl${CMAKE_EXECUTABLE_SUFFIX}")
+add_custom_command(TARGET clang POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E ${CLANGXX_LINK_OR_COPY} "${clang_binary}" "${clang_cl}"
+    WORKING_DIRECTORY "${LLVM_RUNTIME_OUTPUT_INTDIR}")
+
+set_property(DIRECTORY APPEND
+  PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${clang_cl})
+
 install(TARGETS clang
   RUNTIME DESTINATION bin
   COMPONENT clang)
@@ -60,13 +87,8 @@ add_custom_target(install-clang
           -DCMAKE_INSTALL_COMPONENT=clang
           -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
 
-if(NOT CLANG_LINKS_TO_CREATE)
-  set(CLANG_LINKS_TO_CREATE clang++ clang-cl)
-endif()
-
-foreach(link ${CLANG_LINKS_TO_CREATE})
-  add_clang_symlink(${link} clang)
-endforeach()
+# Create the clang++ and clang-cl symlinks at installation time.
+install(SCRIPT clang_symlink.cmake -DCMAKE_INSTALL_PREFIX=\"${CMAKE_INSTALL_PREFIX}\")
 
 # Configure plist creation for OS X.
 set (TOOL_INFO_PLIST "Info.plist" CACHE STRING "Plist name")
diff --git a/tools/driver/clang_symlink.cmake b/tools/driver/clang_symlink.cmake
new file mode 100644
index 0000000000..c01259543c
--- /dev/null
+++ b/tools/driver/clang_symlink.cmake
@@ -0,0 +1,43 @@
+# We need to execute this script at installation time because the
+# DESTDIR environment variable may be unset at configuration time.
+# See PR8397.
+
+if(UNIX)
+  set(CLANGXX_LINK_OR_COPY create_symlink)
+  set(CLANGXX_DESTDIR $ENV{DESTDIR})
+else()
+  set(CLANGXX_LINK_OR_COPY copy)
+endif()
+
+# CMAKE_EXECUTABLE_SUFFIX is undefined on cmake scripts. See PR9286.
+if( WIN32 )
+  set(EXECUTABLE_SUFFIX ".exe")
+else()
+  set(EXECUTABLE_SUFFIX "")
+endif()
+
+set(bindir "${CLANGXX_DESTDIR}${CMAKE_INSTALL_PREFIX}/bin/")
+set(clang "clang${EXECUTABLE_SUFFIX}")
+set(clangxx "clang++${EXECUTABLE_SUFFIX}")
+set(clang_cl "clang-cl${EXECUTABLE_SUFFIX}")
+set(cl "cl${EXECUTABLE_SUFFIX}")
+
+message("Creating clang++ executable based on ${clang}")
+
+execute_process(
+  COMMAND "${CMAKE_COMMAND}" -E ${CLANGXX_LINK_OR_COPY} "${clang}" "${clangxx}"
+  WORKING_DIRECTORY "${bindir}")
+
+message("Creating clang-cl executable based on ${clang}")
+
+execute_process(
+  COMMAND "${CMAKE_COMMAND}" -E ${CLANGXX_LINK_OR_COPY} "${clang}" "${clang_cl}"
+  WORKING_DIRECTORY "${bindir}")
+
+if (WIN32)
+  message("Creating cl executable based on ${clang}")
+
+  execute_process(
+    COMMAND "${CMAKE_COMMAND}" -E ${CLANGXX_LINK_OR_COPY} "${clang}" "../msbuild-bin/${cl}"
+    WORKING_DIRECTORY "${bindir}")
+endif()
-- 
2.40.0