[CMake] Cleanup tools/CMakeLists.txt to take advantage of the auto-registration that was already partially working.

Summary:
This change re-lands r241621, with an additional fix that was required to allow tool sources to live outside the llvm checkout. It also no longer renames LLVM_EXTERNAL_*_SOURCE_DIR. This change was reverted in r241663, because it renamed several variables of the format LLVM_EXTERNAL_*_* to LLVM_TOOL_*_*.

Original Summary:
The tools CMakeLists file already had implicit tool registration, but there were a few things off about it that needed to be altered to make it work. This change addresses all that. The changes in this patch are:

* factored out canonicalizing tool names from paths to CMake variables * removed the LLVM_IMPLICIT_PROJECT_IGNORE mechanism in favor of LLVM_EXTERNAL_${nameUPPER}_BUILD which I renamed to LLVM_TOOL_${nameUPPER}_BUILD because it applies to internal and external tools
* removed ignore_llvm_tool_subdirectory() in favor of just setting LLVM_TOOL_${nameUPPER}_BUILD to Off
* Added create_llvm_tool_options() to resolve a bug in add_llvm_external_project() - the old LLVM_EXTERNAL_${nameUPPER}_BUILD would not work on a clean CMake directory because the option could be created after it was set in code.
* Removed all but the minimum required calls to add_llvm_external_project from tools/CMakeLists.txt

Differential Revision: http://reviews.llvm.org/D10665

llvm-svn: 242059

1 files changed, 21 insertions, 69 deletions

diff --git a/llvm/tools/CMakeLists.txt b/llvm/tools/CMakeLists.txt
index c9c5a1fdfa0..71af2127810 100644
--- a/llvm/tools/CMakeLists.txt
+++ b/llvm/tools/CMakeLists.txt
@@ -1,85 +1,37 @@
-add_llvm_tool_subdirectory(llvm-config)
+# This file will recurse into all subdirectories that contain CMakeLists.txt
+# Setting variables that match the pattern LLVM_TOOL_{NAME}_BUILD to Off will
+# prevent traversing into a directory.
+#
+# The only tools that need to be explicitly added are ones that have explicit
+# ordering requirements.
+
+# Iterates all the subdirectories to create CMake options to enable/disable
+# traversing each directory.
+create_llvm_tool_options()
 
 # Build polly before the tools: the tools link against polly when
 # LINK_POLLY_INTO_TOOLS is set.
 if(WITH_POLLY)
   add_llvm_external_project(polly)
-else(WITH_POLLY)
-  list(APPEND LLVM_IMPLICIT_PROJECT_IGNORE "${LLVM_MAIN_SRC_DIR}/tools/polly")
-endif(WITH_POLLY)
-
-if( LLVM_BUILD_LLVM_DYLIB )
-  add_llvm_tool_subdirectory(llvm-shlib)
 else()
-  ignore_llvm_tool_subdirectory(llvm-shlib)
+  set(LLVM_TOOL_POLLY_BUILD Off)
 endif()
 
-add_llvm_tool_subdirectory(opt)
-add_llvm_tool_subdirectory(llvm-as)
-add_llvm_tool_subdirectory(llvm-dis)
-add_llvm_tool_subdirectory(llvm-mc)
-
-add_llvm_tool_subdirectory(llc)
-add_llvm_tool_subdirectory(llvm-ar)
-add_llvm_tool_subdirectory(llvm-nm)
-add_llvm_tool_subdirectory(llvm-size)
-
-add_llvm_tool_subdirectory(llvm-cov)
-add_llvm_tool_subdirectory(llvm-profdata)
-add_llvm_tool_subdirectory(llvm-link)
-add_llvm_tool_subdirectory(lli)
-
-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)
-add_llvm_tool_subdirectory(dsymutil)
-add_llvm_tool_subdirectory(llvm-cxxdump)
-if( LLVM_USE_INTEL_JITEVENTS )
-  add_llvm_tool_subdirectory(llvm-jitlistener)
-else()
-  ignore_llvm_tool_subdirectory(llvm-jitlistener)
-endif( LLVM_USE_INTEL_JITEVENTS )
-
-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_llvm_tool_subdirectory(verify-uselistorder)
-
-add_llvm_tool_subdirectory(llvm-symbolizer)
-
-add_llvm_tool_subdirectory(llvm-c-test)
-
-add_llvm_tool_subdirectory(obj2yaml)
-add_llvm_tool_subdirectory(yaml2obj)
-
-add_llvm_tool_subdirectory(llvm-go)
-
-add_llvm_tool_subdirectory(llvm-pdbdump)
-
-if(NOT CYGWIN AND LLVM_ENABLE_PIC)
-  add_llvm_tool_subdirectory(lto)
-  add_llvm_tool_subdirectory(llvm-lto)
-else()
-  ignore_llvm_tool_subdirectory(lto)
-  ignore_llvm_tool_subdirectory(llvm-lto)
+if(NOT LLVM_BUILD_LLVM_DYLIB )
+  set(LLVM_TOOL_LLVM_SHLIB_BUILD Off)
 endif()
 
-add_llvm_tool_subdirectory(gold)
+if(NOT LLVM_USE_INTEL_JITEVENTS )
+  set(LLVM_TOOL_LLVM_JITLISTENER_BUILD Off)
+endif()
 
-add_llvm_external_project(clang)
-add_llvm_external_project(llgo)
-add_llvm_external_project(lld)
-add_llvm_external_project(lldb)
+if(CYGWIN OR NOT LLVM_ENABLE_PIC)
+  set(LLVM_TOOL_LTO_BUILD Off)
+  set(LLVM_TOOL_LLVM_LTO_BUILD Off)
+endif()
 
 # Automatically add remaining sub-directories containing a 'CMakeLists.txt'
 # file as external projects.
-add_llvm_implicit_external_projects()
+add_llvm_implicit_projects()
 
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)