[cmake] move SONAME handling to llvm_add_library

Summary:
Move handling of the SONAME option from add_llvm_library
to llvm_add_library, so that it can be used in sub-projects.
In particular, this makes it possible to have consistently
named shared libraries for LLVM, Clang and LLDB.

Also, base the SONAME and symlinks on the output name
by extracting the OUTPUT_NAME property, rather than assuming
it is the same as the target name.

Reviewers: beanz

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D14539

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252669 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/AddLLVM.cmake

@@ -448,6 +448,24 @@ function(llvm_add_library name)
     endif()
   endif()
 
+  if(ARG_SHARED AND UNIX)
+    if(NOT APPLE AND ARG_SONAME)
+      get_target_property(output_name ${name} OUTPUT_NAME)
+      if(${output_name} STREQUAL "output_name-NOTFOUND")
+        set(output_name ${name})
+      endif()
+      set(library_name ${output_name}-${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}${LLVM_VERSION_SUFFIX})
+      set(api_name ${output_name}-${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 ${name}
+        ALWAYS_GENERATE)
+      llvm_install_library_symlink(${output_name} ${library_name} SHARED
+        COMPONENT ${name}
+        ALWAYS_GENERATE)
+    endif()
+  endif()
+
   # Add the explicit dependency information for this library.
   #
   # It would be nice to verify that we have the dependencies for this library
@@ -498,7 +516,7 @@ endfunction()
 
 macro(add_llvm_library name)
   cmake_parse_arguments(ARG
-    "SHARED;SONAME"
+    "SHARED"
     ""
     ""
     ${ARGN})
@@ -541,19 +559,6 @@ macro(add_llvm_library name)
                                   -DCMAKE_INSTALL_COMPONENT=${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()