[CMake] Automatically pick up subdirectories in llvm/tools as 'external projects' if they contain a 'CMakeLists.txt' file.

Allow CMake to pick up external projects in llvm/tools without the need to modify the "llvm/tools/CMakeLists.txt" file.
This makes it easier to work with projects that live in other repositories, without needing to specify each one in "llvm/tools/CMakeLists.txt".

llvm-svn: 188921

llvm/cmake/modules/AddLLVM.cmake

@@ -146,6 +146,7 @@ macro(add_llvm_external_project name)
   if("${add_llvm_external_dir}" STREQUAL "")
     set(add_llvm_external_dir ${name})
   endif()
+  list(APPEND LLVM_IMPLICIT_PROJECT_IGNORE "${CMAKE_CURRENT_SOURCE_DIR}/${add_llvm_external_dir}")
   string(REPLACE "-" "_" nameUNDERSCORE ${name})
   string(TOUPPER ${nameUNDERSCORE} nameUPPER)
   set(LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/${add_llvm_external_dir}"
@@ -160,6 +161,34 @@ macro(add_llvm_external_project name)
   endif()
 endmacro(add_llvm_external_project)
 
+macro(add_llvm_tool_subdirectory name)
+  list(APPEND LLVM_IMPLICIT_PROJECT_IGNORE "${CMAKE_CURRENT_SOURCE_DIR}/${name}")
+  add_subdirectory(${name})
+endmacro(add_llvm_tool_subdirectory)
+
+macro(ignore_llvm_tool_subdirectory name)
+  list(APPEND LLVM_IMPLICIT_PROJECT_IGNORE "${CMAKE_CURRENT_SOURCE_DIR}/${name}")
+endmacro(ignore_llvm_tool_subdirectory)
+
+function(add_llvm_implicit_external_projects)
+  set(list_of_implicit_subdirs "")
+  file(GLOB sub-dirs "${CMAKE_CURRENT_SOURCE_DIR}/*")
+  foreach(dir ${sub-dirs})
+    if(IS_DIRECTORY "${dir}")
+      list(FIND LLVM_IMPLICIT_PROJECT_IGNORE "${dir}" tool_subdir_ignore)
+      if( tool_subdir_ignore EQUAL -1
+          AND EXISTS "${dir}/CMakeLists.txt")
+        get_filename_component(fn "${dir}" NAME)
+        list(APPEND list_of_implicit_subdirs "${fn}")
+      endif()
+    endif()
+  endforeach()
+
+  foreach(external_proj ${list_of_implicit_subdirs})
+    add_llvm_external_project("${external_proj}")
+  endforeach()
+endfunction(add_llvm_implicit_external_projects)
+
 # Generic support for adding a unittest.
 function(add_unittest test_suite test_name)
   set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})

llvm/tools/CMakeLists.txt

@@ -5,64 +5,74 @@
 if( NOT WIN32 OR MSYS OR CYGWIN )
   # We currently require 'sed' to build llvm-config, so don't try to build it
   # on pure Win32.
-  add_subdirectory(llvm-config)
+  add_llvm_tool_subdirectory(llvm-config)
+else()
+  ignore_llvm_tool_subdirectory(llvm-config)
 endif()
 
-add_subdirectory(opt)
-add_subdirectory(llvm-as)
-add_subdirectory(llvm-dis)
-add_subdirectory(llvm-mc)
+add_llvm_tool_subdirectory(opt)
+add_llvm_tool_subdirectory(llvm-as)
+add_llvm_tool_subdirectory(llvm-dis)
+add_llvm_tool_subdirectory(llvm-mc)
 
-add_subdirectory(llc)
-add_subdirectory(llvm-ar)
-add_subdirectory(llvm-nm)
-add_subdirectory(llvm-size)
+add_llvm_tool_subdirectory(llc)
+add_llvm_tool_subdirectory(llvm-ar)
+add_llvm_tool_subdirectory(llvm-nm)
+add_llvm_tool_subdirectory(llvm-size)
 
-add_subdirectory(llvm-cov)
-add_subdirectory(llvm-prof)
-add_subdirectory(llvm-link)
-add_subdirectory(lli)
+add_llvm_tool_subdirectory(llvm-cov)
+add_llvm_tool_subdirectory(llvm-prof)
+add_llvm_tool_subdirectory(llvm-link)
+add_llvm_tool_subdirectory(lli)
 
-add_subdirectory(llvm-extract)
-add_subdirectory(llvm-diff)
-add_subdirectory(macho-dump)
-add_subdirectory(llvm-objdump)
-add_subdirectory(llvm-readobj)
-add_subdirectory(llvm-rtdyld)
-add_subdirectory(llvm-dwarfdump)
+add_llvm_tool_subdirectory(llvm-extract)
+add_llvm_tool_subdirectory(llvm-diff)
+add_llvm_tool_subdirectory(macho-dump)
+add_llvm_tool_subdirectory(llvm-objdump)
+add_llvm_tool_subdirectory(llvm-readobj)
+add_llvm_tool_subdirectory(llvm-rtdyld)
+add_llvm_tool_subdirectory(llvm-dwarfdump)
 if( LLVM_USE_INTEL_JITEVENTS )
-  add_subdirectory(llvm-jitlistener)
+  add_llvm_tool_subdirectory(llvm-jitlistener)
+else()
+  ignore_llvm_tool_subdirectory(llvm-jitlistener)
 endif( LLVM_USE_INTEL_JITEVENTS )
 
-add_subdirectory(bugpoint)
-add_subdirectory(bugpoint-passes)
-add_subdirectory(llvm-bcanalyzer)
-add_subdirectory(llvm-stress)
-add_subdirectory(llvm-mcmarkup)
+add_llvm_tool_subdirectory(bugpoint)
+add_llvm_tool_subdirectory(bugpoint-passes)
+add_llvm_tool_subdirectory(llvm-bcanalyzer)
+add_llvm_tool_subdirectory(llvm-stress)
+add_llvm_tool_subdirectory(llvm-mcmarkup)
 
-add_subdirectory(llvm-symbolizer)
+add_llvm_tool_subdirectory(llvm-symbolizer)
 
-add_subdirectory(obj2yaml)
-add_subdirectory(yaml2obj)
+add_llvm_tool_subdirectory(obj2yaml)
+add_llvm_tool_subdirectory(yaml2obj)
 
 if( NOT WIN32 )
-  add_subdirectory(lto)
+  add_llvm_tool_subdirectory(lto)
+else()
+  ignore_llvm_tool_subdirectory(lto)
 endif()
 
 if( LLVM_ENABLE_PIC )
   # TODO: support other systems:
   if( (CMAKE_SYSTEM_NAME STREQUAL "Linux")
       OR (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD") )
-    add_subdirectory(gold)
+    add_llvm_tool_subdirectory(gold)
+  else()
+    ignore_llvm_tool_subdirectory(gold)
   endif()
+else()
+  ignore_llvm_tool_subdirectory(gold)
 endif()
 
 add_llvm_external_project(clang)
 
 if( NOT LLVM_INCLUDE_TOOLS STREQUAL "bootstrap-only" )
-  add_llvm_external_project(lld)
-  add_llvm_external_project(lldb)
-  add_llvm_external_project(polly)
+  # Automatically add remaining sub-directories containing a 'CMakeLists.txt'
+  # file as external projects.
+  add_llvm_implicit_external_projects()
 endif()
 
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)