[llvm-branch-commits] [openmp] release/19.x: [OpenMP] Create versioned libgomp softlinks (#112973) (PR #115944)

[via llvm-branch-commits]

https://github.com/llvmbot created https://github.com/llvm/llvm-project/pull/115944

Backport eccdb2489483ca58d2cb35bc38967a8e33117575

Requested by: @ye-luo

>From b82797185fcc335c0f517df8d2dd34658674e2df Mon Sep 17 00:00:00 2001
From: Ye Luo <yeluo at anl.gov>
Date: Fri, 25 Oct 2024 13:19:58 -0500
Subject: [PATCH] [OpenMP] Create versioned libgomp softlinks (#112973)

Add libgomp.1.dylib for MacOS and libgomp.so.1 for Linux

Linkers on Mac and Linux pick up versioned libgomp dynamic library
files. The existing softlinks (libgomp.dylib for MacOS and libgomp.so
for Linux) are insufficient. This helps alleviate the issue of mixing
libgomp and libomp at runtime.

(cherry picked from commit eccdb2489483ca58d2cb35bc38967a8e33117575)
---
 openmp/runtime/src/CMakeLists.txt | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/openmp/runtime/src/CMakeLists.txt b/openmp/runtime/src/CMakeLists.txt
index f106694841ce8d..a02aa6df937243 100644
--- a/openmp/runtime/src/CMakeLists.txt
+++ b/openmp/runtime/src/CMakeLists.txt
@@ -244,6 +244,17 @@ if(NOT WIN32)
       libiomp5${LIBOMP_LIBRARY_SUFFIX}
     WORKING_DIRECTORY ${LIBOMP_LIBRARY_DIR}
   )
+  if(LIBOMP_ENABLE_SHARED)
+    if(APPLE)
+      set(VERSIONED_LIBGOMP_NAME libgomp.1${LIBOMP_LIBRARY_SUFFIX})
+    else()
+      set(VERSIONED_LIBGOMP_NAME libgomp${LIBOMP_LIBRARY_SUFFIX}.1)
+    endif()
+    add_custom_command(TARGET omp POST_BUILD
+      COMMAND ${CMAKE_COMMAND} -E create_symlink ${LIBOMP_LIB_FILE} ${VERSIONED_LIBGOMP_NAME}
+      WORKING_DIRECTORY ${LIBOMP_LIBRARY_DIR}
+    )
+  endif()
 endif()
 
 # Definitions for testing, for reuse when testing libomptarget-nvptx.
@@ -430,13 +441,18 @@ else()
 
   if(${LIBOMP_INSTALL_ALIASES})
     # Create aliases (symlinks) of the library for backwards compatibility
+    extend_path(outdir "${CMAKE_INSTALL_PREFIX}" "${OPENMP_INSTALL_LIBDIR}")
     set(LIBOMP_ALIASES "libgomp;libiomp5")
     foreach(alias IN LISTS LIBOMP_ALIASES)
-      extend_path(outdir "${CMAKE_INSTALL_PREFIX}" "${OPENMP_INSTALL_LIBDIR}")
       install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E create_symlink \"${LIBOMP_LIB_FILE}\"
         \"${alias}${LIBOMP_LIBRARY_SUFFIX}\" WORKING_DIRECTORY
         \"\$ENV{DESTDIR}${outdir}\")")
     endforeach()
+    if(LIBOMP_ENABLE_SHARED)
+      install(CODE "execute_process(COMMAND \"\${CMAKE_COMMAND}\" -E create_symlink \"${LIBOMP_LIB_FILE}\"
+        \"${VERSIONED_LIBGOMP_NAME}\" WORKING_DIRECTORY
+        \"\$ENV{DESTDIR}${outdir}\")")
+    endif()
   endif()
 endif()
 install(