[CMake] Bug 25059 - CMake libllvm.so.$MAJOR.$MINOR shared object name not compatible with ldconfig

Summary:
This change makes the CMake build system generate libraries for Linux and Darwin matching the makefile build system.

Linux libraries follow the pattern lib${name}.${MAJOR}.${MINOR}.so so that ldconfig won't pick it up incorrectly.

Darwin libraries are not versioned.

Note: On linux the non-versioned symlink is generated at install-time not build time. I plan to fix that eventually, but I expect that is good enough for the purposes of fixing this bug.

Reviewers: loladiro, tstellarAMD

Subscribers: axw, llvm-commits

Differential Revision: http://reviews.llvm.org/D13841

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252093 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/AddLLVM.cmake

@@ -324,10 +324,12 @@ endfunction(set_windows_version_resource_properties)
 #     Same semantics as target_link_libraries().
 #   ADDITIONAL_HEADERS
 #     May specify header files for IDE generators.
+#   SONAME
+#     Should set SONAME link flags and create symlinks
 #   )
 function(llvm_add_library name)
   cmake_parse_arguments(ARG
-    "MODULE;SHARED;STATIC;DISABLE_LLVM_LINK_LLVM_DYLIB"
+    "MODULE;SHARED;STATIC;DISABLE_LLVM_LINK_LLVM_DYLIB;SONAME"
     "OUTPUT_NAME"
     "ADDITIONAL_HEADERS;DEPENDS;LINK_COMPONENTS;LINK_LIBS;OBJLIBS"
     ${ARGN})
@@ -432,11 +434,6 @@ function(llvm_add_library name)
         PREFIX ""
         )
     endif()
-
-    set_target_properties(${name}
-      PROPERTIES
-      SOVERSION ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}
-      VERSION ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}${LLVM_VERSION_SUFFIX})
   endif()
 
   if(ARG_MODULE OR ARG_SHARED)
@@ -501,7 +498,7 @@ endfunction()
 
 macro(add_llvm_library name)
   cmake_parse_arguments(ARG
-    "SHARED"
+    "SHARED;SONAME"
     ""
     ""
     ${ARGN})
@@ -544,6 +541,19 @@ macro(add_llvm_library name)
                                   -DCMAKE_INSTALL_COMPONENT=${name}
                                   -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
       endif()
+      if(ARG_SHARED AND UNIX)
+        if(NOT APPLE AND ARG_SONAME)
+          set(library_name ${name}-${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}${LLVM_VERSION_SUFFIX})
+          set(api_name ${name}-${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}${LLVM_VERSION_SUFFIX})
+          set_target_properties(${name} PROPERTIES OUTPUT_NAME ${library_name})
+          llvm_install_library_symlink(${api_name} ${library_name} SHARED
+            COMPONENT ${name}
+            ALWAYS_GENERATE)
+          llvm_install_library_symlink(${name} ${library_name} SHARED
+            COMPONENT ${name}
+            ALWAYS_GENERATE)
+        endif()
+      endif()
     endif()
     set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
   endif()
@@ -1042,6 +1052,41 @@ function(add_lit_testsuites project directory)
   endif()
 endfunction()
 
+function(llvm_install_library_symlink name dest type)
+  cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+  foreach(path ${CMAKE_MODULE_PATH})
+    if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+      set(INSTALL_SYMLINK ${path}/LLVMInstallSymlink.cmake)
+      break()
+    endif()
+  endforeach()
+
+  set(component ${ARG_COMPONENT})
+  if(NOT component)
+    set(component ${name})
+  endif()
+
+  set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+  set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+
+  set(output_dir lib)
+  if(WIN32 AND "${type}" STREQUAL "SHARED")
+    set(output_dir bin)
+  endif()
+
+  install(SCRIPT ${INSTALL_SYMLINK}
+          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+          COMPONENT ${component})
+
+  if (NOT CMAKE_CONFIGURATION_TYPES AND NOT ARG_ALWAYS_GENERATE)
+    add_custom_target(install-${name}
+                      DEPENDS ${name} ${dest} install-${dest}
+                      COMMAND "${CMAKE_COMMAND}"
+                              -DCMAKE_INSTALL_COMPONENT=${name}
+                              -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
+  endif()
+endfunction()
+
 function(llvm_install_symlink name dest)
   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "" "" ${ARGN})
   foreach(path ${CMAKE_MODULE_PATH})

tools/llvm-shlib/CMakeLists.txt

@@ -38,7 +38,7 @@ if(LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
   add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
 endif()
 
-add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB ${SOURCES})
+add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB SONAME ${SOURCES})
 
 list(REMOVE_DUPLICATES LIB_NAMES)
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") # FIXME: It should be "GNU ld for elf"