[OpenMP] Create versioned libgomp softlinks.

libgomp.1.dylib for MacOS or libgomp.so.1 for Linux

Author: ye-luo

openmp/runtime/src/CMakeLists.txt

@@ -253,6 +253,17 @@ 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.
@@ -439,13 +450,18 @@ 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(