From 89ab78e360b7b20ebe1bc89736880a8e4aaa9e6e Mon Sep 17 00:00:00 2001
From: Michal Gorny <mgorny@gentoo.org>
Date: Wed, 14 Sep 2016 17:46:27 +0000
Subject: [PATCH] [cmake] Make libgomp & libiomp5 alias install optional

Introduce a new LIBOMP_INSTALL_VARIABLES cache variable that can be used
to disable creating libgomp and libiomp5 aliases on 'make install'.
Those aliases are undesired e.g. on Gentoo systems where libomp is used
purely by clang.

Differential Revision: https://reviews.llvm.org/D24563

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@281512 91177308-0d34-0410-b5e6-96231b3b80d8
---
 runtime/CMakeLists.txt     |  4 ++++
 runtime/src/CMakeLists.txt | 16 +++++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
index 9db058b..e8e9a74 100644
--- a/runtime/CMakeLists.txt
+++ b/runtime/CMakeLists.txt
@@ -340,6 +340,10 @@ endif()
 
 set(LIBOMP_LIB_FILE ${LIBOMP_LIB_NAME}${LIBOMP_LIBRARY_SUFFIX})
 
+# Optional backwards compatibility aliases.
+set(LIBOMP_INSTALL_ALIASES TRUE CACHE BOOL
+  "Install libgomp and libiomp5 library aliases for backwards compatibility")
+
 # Print configuration after all variables are set.
 if(${LIBOMP_STANDALONE_BUILD})
   libomp_say("Operating System     -- ${CMAKE_SYSTEM_NAME}")
diff --git a/runtime/src/CMakeLists.txt b/runtime/src/CMakeLists.txt
index 777434d..c80f88d 100644
--- a/runtime/src/CMakeLists.txt
+++ b/runtime/src/CMakeLists.txt
@@ -305,13 +305,15 @@ else()
 
   install(TARGETS omp ${LIBOMP_INSTALL_KIND} DESTINATION lib${LIBOMP_LIBDIR_SUFFIX})
 
-  # Create aliases (symlinks) of the library for backwards compatibility
-  set(LIBOMP_ALIASES "libgomp;libiomp5")
-  foreach(alias IN LISTS LIBOMP_ALIASES)
-    install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E create_symlink \"${LIBOMP_LIB_FILE}\"
-      \"${alias}${LIBOMP_LIBRARY_SUFFIX}\" WORKING_DIRECTORY
-      \$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/lib${LIBOMP_LIBDIR_SUFFIX})")
-  endforeach()
+  if(${LIBOMP_INSTALL_ALIASES})
+    # Create aliases (symlinks) of the library for backwards compatibility
+    set(LIBOMP_ALIASES "libgomp;libiomp5")
+    foreach(alias IN LISTS LIBOMP_ALIASES)
+      install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E create_symlink \"${LIBOMP_LIB_FILE}\"
+        \"${alias}${LIBOMP_LIBRARY_SUFFIX}\" WORKING_DIRECTORY
+        \$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/lib${LIBOMP_LIBDIR_SUFFIX})")
+    endforeach()
+  endif()
 endif()
 install(
   FILES
-- 
2.4.10