[CMake] Add support for building the llvm test-suite as part of an LLVM build using clang and lld

[beanz]

Summary

This patch adds a new CMake module for working with ExternalProjects. This wrapper for ExternalProject supports using just-built tools and can hook up dependencies properly so that projects get cleared out.

The example usage here is for the llvm test-suite. In this example, the test-suite is setup as dependent on clang and lld if they are in-tree. If the clang or lld binaries change the test-suite is re-configured, cleaned, and rebuilt.

This cleanup and abstraction wrapping ExternalProject can be extended and applied to other runtime libraries like compiler-rt and libcxx.

[jmolloy]

Hi Chris,

This is awesome! This is so much better than the approach I was taking for test-suite (recursion, like the cross-compile build does). I have a few comments.

Cheers,

James

cmake/modules/LLVMExternalProjectUtils.cmake

7

Is there a ninja equivalent, do you know?

45

It's confusing that this is testing CLANG_IN_TOOLCHAIN before it is set. Is this deliberate? if so it could do with some comments.

77

Clobbering*

105

Clobbering*

[rengolin]

So, one could just:

$ make test-suite

from the main LLVM build tree? That'd be awesome!

Would it be that much harder to add RT and libc++ now?

[beanz]

So the idea here is make test-suite or ninja test-suite will work, and if clang or lld change it will do a full re-configure, clean, rebuild.

Updates coming shortly to fix issues.

cmake/modules/LLVMExternalProjectUtils.cmake

7

No, it isn't needed for Ninja. Make fails oddly if two instances try to manipulate the same directory, and this is fixed by invoking make directly from make because the processes will talk to each other.

Ninja has now IPC, and it just doesn't die in odd ways when two instances build on top of each other.

45

No, this is a bug. Will fix.

77

Even with spell check on I can't spell.

[beanz]

• Reworked haandling runtime dependencies to support both compiler-rt and libcxx
• Fixed spelling

[jmolloy]

LGTM!

CMakeLists.txt

if( LLVM_INCLUDE_TOOLS )
   add_subdirectory(tools)
 endif()
 
 if( LLVM_INCLUDE_EXAMPLES )
   add_subdirectory(examples)
 endif()
 
 if( LLVM_INCLUDE_TESTS )
+  if(EXISTS ${LLVM_MAIN_SRC_DIR}/projects/test-suite AND TARGET clang)
+    include(LLVMExternalProjectUtils)
+    llvm_ExternalProject_Add(test-suite ${LLVM_MAIN_SRC_DIR}/projects/test-suite
+      USE_TOOLCHAIN
+      EXCLUDE_FROM_ALL
+      NO_INSTALL)
+  endif()
   add_subdirectory(test)
   add_subdirectory(unittests)
   if (MSVC)
     # This utility is used to prevent crashing tests from calling Dr. Watson on
     # Windows.
     add_subdirectory(utils/KillTheDoctor)
   endif()
 

cmake/modules/LLVMExternalProjectUtils.cmake

+include(ExternalProject)
+
+# llvm_ExternalProject_BuildCmd(out_var target)
+#   Utility function for constructing command lines for external project targets
+function(llvm_ExternalProject_BuildCmd out_var target)
+  if (CMAKE_GENERATOR MATCHES "Make")
+    # Use special command for Makefiles to support parallelism.
+    set(${out_var} "$(MAKE)" "${target}" PARENT_SCOPE)
+  else()
+    set(${out_var} ${CMAKE_COMMAND} --build . --target ${target}
+                                    --config $<CONFIGURATION> PARENT_SCOPE)
+  endif()
+endfunction()
+
+# llvm_ExternalProject_Add(name source_dir ...
+#   USE_TOOLCHAIN
+#     Use just-built tools (see TOOLCHAIN_TOOLS)
+#   EXCLUDE_FROM_ALL
+#     Exclude this project from the all target
+#   NO_INSTALL
+#     Don't generate install targets for this project
+#   CMAKE_ARGS arguments...
+#     Optional cmake arguments to pass when configuring the project
+#   TOOLCHAIN_TOOLS targets...
+#     Targets for toolchain tools (defaults to clang;lld)
+#   DEPENDS targets...
+#     Targets that this project depends on
+#   EXTRA_TARGETS targets...
+#     Extra targets in the subproject to generate targets for
+#   )
+function(llvm_ExternalProject_Add name source_dir)
+  cmake_parse_arguments(ARG "USE_TOOLCHAIN;EXCLUDE_FROM_ALL;NO_INSTALL"
+    "SOURCE_DIR"
+    "CMAKE_ARGS;TOOLCHAIN_TOOLS;DEPENDS;EXTRA_TARGETS" ${ARGN})
+  canonicalize_tool_name(${name} nameCanon)
+  if(NOT ARG_TOOLCHAIN_TOOLS)
+    set(ARG_TOOLCHAIN_TOOLS clang lld)
+  endif()
+  foreach(tool ${ARG_TOOLCHAIN_TOOLS})
+    if(TARGET ${tool})
+      list(APPEND TOOLCHAIN_TOOLS ${tool})
+      list(APPEND TOOLCHAIN_BINS $<TARGET_FILE:${tool}>)
+    endif()
+  endforeach()
+  if(TARGET compiler-rt AND CLANG_IN_TOOLCHAIN)
+    list(APPEND TOOLCHAIN_BINS compiler-rt)
+  endif()
+
+  list(FIND TOOLCHAIN_TOOLS clang FOUND_CLANG)
+  if(FOUND_CLANG GREATER -1)
+    set(CLANG_IN_TOOLCHAIN On)
+  endif()
+
+  if(CMAKE_VERSION VERSION_GREATER 3.1.0)
+    set(cmake_3_1_EXCLUDE_FROM_ALL EXCLUDE_FROM_ALL 1)
+  endif()
+
+  if(CMAKE_VERSION VERSION_GREATER 3.3.20150708)
+    set(cmake_3_4_USES_TERMINAL_OPTIONS
+      USES_TERMINAL_CONFIGURE 1
+      USES_TERMINAL_BUILD 1
+      USES_TERMINAL_INSTALL 1
+      )
+    set(cmake_3_4_USES_TERMINAL USES_TERMINAL 1)
+  endif()
+
+  if(CMAKE_VERSION VERSION_GREATER 3.1.20141116)
+    set(cmake_3_2_USES_TERMINAL USES_TERMINAL)
+  endif()
+
+  set(STAMP_DIR ${CMAKE_CURRENT_BINARY_DIR}/${name}-stamps/)
+  set(BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/${name}-bins/)
+
+  add_custom_target(${name}-clear
+    COMMAND ${CMAKE_COMMAND} -E remove_directory ${BINARY_DIR}
+    COMMAND ${CMAKE_COMMAND} -E remove_directory ${STAMP_DIR}
+    COMMENT "Clobberring ${name} build and stamp directories"
+    ${cmake_3_2_USES_TERMINAL}
+    )
+
+  # Find all variables that start with COMPILER_RT and populate a variable with
+  # them.
+  get_cmake_property(variableNames VARIABLES)
+  foreach(varaibleName ${variableNames})
+    if(${varaibleName} MATCHES "^${nameCanon}")
+      list(APPEND PASSTHROUGH_VARIABLES
+        -D${varaibleName}=${${varaibleName}})
+    endif()
+  endforeach()
+
+  if(ARG_USE_TOOLCHAIN)
+    if(CLANG_IN_TOOLCHAIN)
+      set(compiler_args -DCMAKE_C_COMPILER=${LLVM_RUNTIME_OUTPUT_INTDIR}/clang
+                        -DCMAKE_CXX_COMPILER=${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++)
+    endif()
+    list(APPEND ARG_DEPENDS ${TOOLCHAIN_TOOLS})
+  endif()
+
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp
+    DEPENDS ${ARG_DEPENDS}
+    COMMAND ${CMAKE_COMMAND} -E touch ${BINARY_DIR}/CMakeCache.txt
+    COMMAND ${CMAKE_COMMAND} -E touch ${STAMP_DIR}/${name}-mkdir
+    COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp
+    COMMENT "Clobberring bootstrap build and stamp directories"
+    )
+
+  add_custom_target(${name}-clobber
+    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp)
+
+  if(ARG_EXCLUDE_FROM_ALL)
+    set(exclude ${cmake_3_1_EXCLUDE_FROM_ALL})
+  endif()
+
+  ExternalProject_Add(${name}
+    DEPENDS ${ARG_DEPENDS}
+    ${name}-clobber
+    PREFIX ${CMAKE_BINARY_DIR}/projects/${name}
+    SOURCE_DIR ${source_dir}
+    STAMP_DIR ${STAMP_DIR}
+    BINARY_DIR ${BINARY_DIR}
+    ${exclude}
+    CMAKE_ARGS ${${nameCanon}_CMAKE_ARGS}
+               ${compiler_args}
+               -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
+               ${ARG_CMAKE_ARGS}
+               ${PASSTHROUGH_VARIABLES}
+    INSTALL_COMMAND ""
+    STEP_TARGETS configure build
+    ${cmake_3_4_USES_TERMINAL_OPTIONS}
+    )
+
+  if(ARG_USE_TOOLCHAIN)
+    ExternalProject_Add_Step(${name} force-rebuild
+      COMMENT "Forcing rebuild becaues tools have changed"
+      DEPENDERS configure
+      DEPENDS ${TOOLCHAIN_BINS}
+      ${cmake_3_4_USES_TERMINAL} )
+  endif()
+
+  if(ARG_USE_TOOLCHAIN)
+    set(force_deps DEPENDS ${TOOLCHAIN_BINS})
+  endif()
+
+  llvm_ExternalProject_BuildCmd(run_clean clean)
+  ExternalProject_Add_Step(${name} clean
+    COMMAND ${run_clean}
+    COMMENT "Cleaning ${name}..."
+    DEPENDEES configure
+    ${force_deps}
+    WORKING_DIRECTORY ${BINARY_DIR}
+    ${cmake_3_4_USES_TERMINAL}
+    )
+  ExternalProject_Add_StepTargets(${name} clean)
+
+  if(ARG_USE_TOOLCHAIN)
+    add_dependencies(${name}-clean ${name}-clobber)
+    set_target_properties(${name}-clean PROPERTIES
+      SOURCES ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp)
+  endif()
+
+  if(NOT ARG_NO_INSTALL)
+    install(CODE "execute_process\(COMMAND \${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=\${CMAKE_INSTALL_PREFIX} -P ${BINARY_DIR}/cmake_install.cmake \)"
+      COMPONENT ${name})
+
+    add_custom_target(install-${name}
+                      DEPENDS ${name}
+                      COMMAND "${CMAKE_COMMAND}"
+                               -DCMAKE_INSTALL_COMPONENT=${name}
+                               -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
+                      ${cmake_3_2_USES_TERMINAL})
+  endif()
+
+  # Add top-level targets
+  foreach(target ${ARG_EXTRA_TARGETS})
+    llvm_ExternalProject_BuildCmd(build_runtime_cmd ${target})
+    add_custom_target(${target}
+      COMMAND ${build_runtime_cmd}
+      DEPENDS ${name}-configure
+      WORKING_DIRECTORY ${BINARY_DIR}
+      VERBATIM
+      ${cmake_3_2_USES_TERMINAL})
+  endforeach()
+endfunction()