From ba4920e98e2f5ef33024e16979786981e705cc80 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@google.com>
Date: Thu, 21 Oct 2021 10:32:01 -0700
Subject: Revert "[CMake] Cache the compiler-rt library search results"

This reverts commit 0eed292fbae22a8856682b07e1cb968424b49941, there
are compiler-rt build failures that appear to have been introduced
by this change.
---
 cmake/Modules/HandleCompilerRT.cmake | 101 -----------------------------------
 1 file changed, 101 deletions(-)
 delete mode 100644 cmake/Modules/HandleCompilerRT.cmake

(limited to 'cmake')

diff --git a/cmake/Modules/HandleCompilerRT.cmake b/cmake/Modules/HandleCompilerRT.cmake
deleted file mode 100644
index 00661d102c2a..000000000000
--- a/cmake/Modules/HandleCompilerRT.cmake
+++ /dev/null
@@ -1,101 +0,0 @@
-# Check if compile-rt library file path exists.
-# If found, cache the path in:
-#    COMPILER_RT_LIBRARY-<name>-<target>
-# If err_flag is true OR path not found, emit a message and set:
-#    COMPILER_RT_LIBRARY-<name>-<target> to NOTFOUND
-function(cache_compiler_rt_library err_flag name target library_file)
-  if(err_flag OR NOT EXISTS "${library_file}")
-    message(STATUS "Failed to find compiler-rt ${name} library for ${target}")
-    set(COMPILER_RT_LIBRARY_${name}_${target} "NOTFOUND" CACHE INTERNAL
-        "compiler-rt ${name} library for ${target}")
-  else()
-    message(STATUS "Found compiler-rt ${name} library: ${library_file}")
-    set(COMPILER_RT_LIBRARY_${name}_${target} "${library_file}" CACHE INTERNAL
-        "compiler-rt ${name} library for ${target}")
-  endif()
-endfunction()
-
-function(get_component_name name variable)
-  if(APPLE)
-    if(NOT name MATCHES "builtins.*")
-      set(component_name "${name}_")
-    endif()
-    # TODO: Support ios, tvos and watchos as well.
-    set(component_name "${component_name}osx")
-  else()
-    set(component_name "${name}")
-  endif()
-  set(${variable} "${component_name}" PARENT_SCOPE)
-endfunction()
-
-# Find the path to compiler-rt library `name` (e.g. "builtins") for the
-# specified `TARGET` (e.g. "x86_64-linux-gnu") and return it in `variable`.
-# This calls cache_compiler_rt_library that caches the path to speed up
-# repeated invocations with the same `name` and `target`.
-function(find_compiler_rt_library name variable)
-  cmake_parse_arguments(ARG "" "TARGET" "" ${ARGN})
-  # While we can use compiler-rt runtimes with other compilers, we need to
-  # query the compiler for runtime location and thus we require Clang.
-  if(NOT CMAKE_CXX_COMPILER_ID MATCHES Clang)
-    set(${variable} "NOTFOUND" PARENT_SCOPE)
-    return()
-  endif()
-  set(target "${ARG_TARGET}")
-  if(NOT target AND CMAKE_CXX_COMPILER_TARGET)
-    set(target "${CMAKE_CXX_COMPILER_TARGET}")
-  endif()
-  if(NOT DEFINED COMPILER_RT_LIBRARY_builtins_${target})
-    # If the cache variable is not defined, invoke Clang and then
-    # set it with cache_compiler_rt_library.
-    set(clang_command ${CMAKE_CXX_COMPILER} ${CMAKE_REQUIRED_FLAGS})
-    if(target)
-      list(APPEND clang_command "--target=${target}")
-    endif()
-    get_property(cxx_flags CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
-    string(REPLACE " " ";" cxx_flags "${cxx_flags}")
-    list(APPEND clang_command ${cxx_flags})
-    execute_process(
-      COMMAND ${clang_command} "--rtlib=compiler-rt" "-print-libgcc-file-name"
-      RESULT_VARIABLE had_error
-      OUTPUT_VARIABLE library_file
-    )
-    string(STRIP "${library_file}" library_file)
-    file(TO_CMAKE_PATH "${library_file}" library_file)
-    get_filename_component(dirname ${library_file} DIRECTORY)
-    if(APPLE)
-      execute_process(
-        COMMAND ${clang_command} "--print-resource-dir"
-        RESULT_VARIABLE had_error
-        OUTPUT_VARIABLE resource_dir
-      )
-      string(STRIP "${resource_dir}" resource_dir)
-      set(dirname "${resource_dir}/lib/darwin")
-    endif()
-    get_filename_component(basename ${library_file} NAME)
-    if(basename MATCHES "libclang_rt\.([a-z0-9_\-]+)\.a")
-      set(from_name ${CMAKE_MATCH_1})
-      get_component_name(${CMAKE_MATCH_1} to_name)
-      string(REPLACE "${from_name}" "${to_name}" basename "${basename}")
-      set(library_file "${dirname}/${basename}")
-      cache_compiler_rt_library(${had_error} builtins "${target}" "${library_file}")
-    endif()
-  endif()
-  if(NOT COMPILER_RT_LIBRARY_builtins_${target})
-    set(${variable} "NOTFOUND" PARENT_SCOPE)
-    return()
-  endif()
-  if(NOT DEFINED COMPILER_RT_LIBRARY_${name}_${target})
-    # Clang gives only the builtins library path. Other library paths are
-    # obtained by substituting "builtins" with ${name} in the builtins
-    # path and then checking if the resultant path exists. The result of
-    # this check is also cached by cache_compiler_rt_library.
-    set(library_file "${COMPILER_RT_LIBRARY_builtins_${target}}")
-    if(library_file MATCHES ".*libclang_rt\.([a-z0-9_\-]+)\.a")
-      set(from_name ${CMAKE_MATCH_0})
-      get_component_name(${name} to_name)
-      string(REPLACE "${from_name}" "${to_name}" library_file "${library_file}")
-      cache_compiler_rt_library(FALSE "${name}" "${target}" "${library_file}")
-    endif()
-  endif()
-  set(${variable} "${COMPILER_RT_LIBRARY_${name}_${target}}" PARENT_SCOPE)
-endfunction()
-- 
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