[libc++] Remove support for building through llvm-config
We've decided to move away from that by requiring that libc++ is built
as part of the monorepo a while ago. This commit removes code pertaining
to that unsupported use case and produces a clear error when the user
violates that.
In fact, building outside of the monorepo will still work as long as
LLVM_PATH is pointing to the root of the LLVM project, although that
is not officially supported.
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 8bc62db272448035d60ca9f31ff67040a288063c
diff --git a/cmake/Modules/HandleOutOfTreeLLVM.cmake b/cmake/Modules/HandleOutOfTreeLLVM.cmake
index 5746afb..757450a 100644
--- a/cmake/Modules/HandleOutOfTreeLLVM.cmake
+++ b/cmake/Modules/HandleOutOfTreeLLVM.cmake
@@ -1,142 +1,74 @@
-macro(find_llvm_parts)
-# Rely on llvm-config.
- set(CONFIG_OUTPUT)
- if(NOT LLVM_CONFIG_PATH)
- find_program(LLVM_CONFIG_PATH "llvm-config")
+if(NOT IS_DIRECTORY ${LLVM_PATH})
+ message(FATAL_ERROR
+ "The provided LLVM_PATH (${LLVM_PATH}) is not a valid directory. Note that "
+ "building libc++ outside of the monorepo is not supported anymore. Please "
+ "use a Standalone build against the monorepo, a Runtimes build or a classic "
+ "monorepo build.")
+endif()
+
+set(LLVM_INCLUDE_DIR ${LLVM_PATH}/include CACHE PATH "Path to llvm/include")
+set(LLVM_PATH ${LLVM_PATH} CACHE PATH "Path to LLVM source tree")
+set(LLVM_MAIN_SRC_DIR ${LLVM_PATH})
+set(LLVM_CMAKE_PATH "${LLVM_PATH}/cmake/modules")
+
+if (EXISTS "${LLVM_CMAKE_PATH}")
+ list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
+elseif (EXISTS "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+ list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+else()
+ message(FATAL_ERROR "Neither ${LLVM_CMAKE_PATH} nor ${LLVM_MAIN_SRC_DIR}/cmake/modules found. "
+ "This is not a supported configuration.")
+endif()
+
+message(STATUS "Configuring for standalone build.")
+set(LIBCXX_STANDALONE_BUILD 1)
+
+# Add LLVM Functions --------------------------------------------------------
+if (WIN32)
+ set(LLVM_ON_UNIX 0)
+ set(LLVM_ON_WIN32 1)
+else()
+ set(LLVM_ON_UNIX 1)
+ set(LLVM_ON_WIN32 0)
+endif()
+
+include(AddLLVM OPTIONAL)
+
+# LLVM Options --------------------------------------------------------------
+if (NOT DEFINED LLVM_INCLUDE_TESTS)
+ set(LLVM_INCLUDE_TESTS ${LLVM_FOUND})
+endif()
+if (NOT DEFINED LLVM_INCLUDE_DOCS)
+ set(LLVM_INCLUDE_DOCS ${LLVM_FOUND})
+endif()
+if (NOT DEFINED LLVM_ENABLE_SPHINX)
+ set(LLVM_ENABLE_SPHINX OFF)
+endif()
+
+# In a standalone build, we don't have llvm to automatically generate the
+# llvm-lit script for us. So we need to provide an explicit directory that
+# the configurator should write the script into.
+set(LLVM_LIT_OUTPUT_DIR "${libcxx_BINARY_DIR}/bin")
+
+if (LLVM_INCLUDE_TESTS)
+ # Required LIT Configuration ------------------------------------------------
+ # Define the default arguments to use with 'lit', and an option for the user
+ # to override.
+ set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
+ set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
+ if (MSVC OR XCODE)
+ set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
endif()
- if(DEFINED LLVM_PATH)
- set(LLVM_INCLUDE_DIR ${LLVM_INCLUDE_DIR} CACHE PATH "Path to llvm/include")
- set(LLVM_PATH ${LLVM_PATH} CACHE PATH "Path to LLVM source tree")
- set(LLVM_MAIN_SRC_DIR ${LLVM_PATH})
- set(LLVM_CMAKE_PATH "${LLVM_PATH}/cmake/modules")
- if (NOT IS_DIRECTORY "${LLVM_PATH}")
- message(FATAL_ERROR "The provided LLVM_PATH (${LLVM_PATH}) is not a valid directory")
- endif()
- elseif(LLVM_CONFIG_PATH)
- message(STATUS "Found LLVM_CONFIG_PATH as ${LLVM_CONFIG_PATH}")
- set(LIBCXX_USING_INSTALLED_LLVM 1)
- set(CONFIG_COMMAND ${LLVM_CONFIG_PATH}
- "--includedir"
- "--prefix"
- "--src-root")
- execute_process(
- COMMAND ${CONFIG_COMMAND}
- RESULT_VARIABLE HAD_ERROR
- OUTPUT_VARIABLE CONFIG_OUTPUT
- )
- if(NOT HAD_ERROR)
- string(REGEX REPLACE
- "[ \t]*[\r\n]+[ \t]*" ";"
- CONFIG_OUTPUT ${CONFIG_OUTPUT})
- else()
- string(REPLACE ";" " " CONFIG_COMMAND_STR "${CONFIG_COMMAND}")
- message(STATUS "${CONFIG_COMMAND_STR}")
- message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
- endif()
+ set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
+endif()
- list(GET CONFIG_OUTPUT 0 INCLUDE_DIR)
- list(GET CONFIG_OUTPUT 1 LLVM_OBJ_ROOT)
- list(GET CONFIG_OUTPUT 2 MAIN_SRC_DIR)
+# Required doc configuration
+if (LLVM_ENABLE_SPHINX)
+ find_package(Sphinx REQUIRED)
+endif()
- set(LLVM_INCLUDE_DIR ${INCLUDE_DIR} CACHE PATH "Path to llvm/include")
- set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
- set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
-
- # --cmakedir is supported since llvm r291218 (4.0 release)
- execute_process(
- COMMAND ${LLVM_CONFIG_PATH} --cmakedir
- RESULT_VARIABLE HAD_ERROR
- OUTPUT_VARIABLE CONFIG_OUTPUT
- ERROR_QUIET)
- if(NOT HAD_ERROR)
- string(STRIP "${CONFIG_OUTPUT}" LLVM_CMAKE_PATH_FROM_LLVM_CONFIG)
- file(TO_CMAKE_PATH "${LLVM_CMAKE_PATH_FROM_LLVM_CONFIG}" LLVM_CMAKE_PATH)
- else()
- file(TO_CMAKE_PATH "${LLVM_BINARY_DIR}" LLVM_BINARY_DIR_CMAKE_STYLE)
- set(LLVM_CMAKE_PATH "${LLVM_BINARY_DIR_CMAKE_STYLE}/lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm")
- endif()
- else()
- set(LLVM_FOUND OFF)
- message(WARNING "UNSUPPORTED LIBCXX CONFIGURATION DETECTED: "
- "llvm-config not found and LLVM_PATH not defined.\n"
- "Reconfigure with -DLLVM_CONFIG_PATH=path/to/llvm-config "
- "or -DLLVM_PATH=path/to/llvm-source-root.")
- return()
- endif()
-
- if (EXISTS "${LLVM_CMAKE_PATH}")
- list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
- elseif (EXISTS "${LLVM_MAIN_SRC_DIR}/cmake/modules")
- list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
- else()
- set(LLVM_FOUND OFF)
- message(WARNING "Neither ${LLVM_CMAKE_PATH} nor ${LLVM_MAIN_SRC_DIR}/cmake/modules found")
- return()
- endif()
-
- set(LLVM_FOUND ON)
-endmacro(find_llvm_parts)
-
-macro(configure_out_of_tree_llvm)
- message(STATUS "Configuring for standalone build.")
- set(LIBCXX_STANDALONE_BUILD 1)
-
- find_llvm_parts()
-
- # Add LLVM Functions --------------------------------------------------------
- if (LLVM_FOUND AND LIBCXX_USING_INSTALLED_LLVM)
- include(LLVMConfig) # For TARGET_TRIPLE
- else()
- if (WIN32)
- set(LLVM_ON_UNIX 0)
- set(LLVM_ON_WIN32 1)
- else()
- set(LLVM_ON_UNIX 1)
- set(LLVM_ON_WIN32 0)
- endif()
- endif()
- if (LLVM_FOUND)
- include(AddLLVM OPTIONAL)
- endif()
-
- # LLVM Options --------------------------------------------------------------
- if (NOT DEFINED LLVM_INCLUDE_TESTS)
- set(LLVM_INCLUDE_TESTS ${LLVM_FOUND})
- endif()
- if (NOT DEFINED LLVM_INCLUDE_DOCS)
- set(LLVM_INCLUDE_DOCS ${LLVM_FOUND})
- endif()
- if (NOT DEFINED LLVM_ENABLE_SPHINX)
- set(LLVM_ENABLE_SPHINX OFF)
- endif()
-
- # In a standalone build, we don't have llvm to automatically generate the
- # llvm-lit script for us. So we need to provide an explicit directory that
- # the configurator should write the script into.
- set(LLVM_LIT_OUTPUT_DIR "${libcxx_BINARY_DIR}/bin")
-
- if (LLVM_INCLUDE_TESTS)
- # Required LIT Configuration ------------------------------------------------
- # Define the default arguments to use with 'lit', and an option for the user
- # to override.
- set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
- set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
- if (MSVC OR XCODE)
- set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
- endif()
- set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
- endif()
-
- # Required doc configuration
- if (LLVM_ENABLE_SPHINX)
- find_package(Sphinx REQUIRED)
- endif()
-
- if (LLVM_ON_UNIX AND NOT APPLE)
- set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
- else()
- set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
- endif()
-endmacro(configure_out_of_tree_llvm)
-
-configure_out_of_tree_llvm()
+if (LLVM_ON_UNIX AND NOT APPLE)
+ set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
+else()
+ set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
+endif()