[libc++] Remove unmaintained support for generating code coverage (#100630)

This patch removes support for generating code coverage information of
libc++, which is unmaintained and I've never been able to utilize. It
would be great to have support for generating code coverage in the test
suite, however this incarnation of it doesn't seem to be properly hooked
up into the test suite. Since it gets in the way of making the test
suite more standalone, remove it.

Author: ldionne

libcxx/CMakeLists.txt

@@ -310,10 +310,6 @@ endif()
 option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." OFF)
 option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
 
-option(LIBCXX_GENERATE_COVERAGE "Enable generating code coverage." OFF)
-set(LIBCXX_COVERAGE_LIBRARY "" CACHE STRING
-    "The Profile-rt library used to build with code coverage")
-
 set(LIBCXX_HERMETIC_STATIC_LIBRARY_DEFAULT OFF)
 if (WIN32)
   set(LIBCXX_HERMETIC_STATIC_LIBRARY_DEFAULT ON)
@@ -376,12 +372,6 @@ if (NOT LIBCXX_ENABLE_RTTI AND LIBCXX_ENABLE_EXCEPTIONS)
                       " for details.")
 endif()
 
-# Ensure LLVM_USE_SANITIZER is not specified when LIBCXX_GENERATE_COVERAGE
-# is ON.
-if (LLVM_USE_SANITIZER AND LIBCXX_GENERATE_COVERAGE)
-  message(FATAL_ERROR "LLVM_USE_SANITIZER cannot be used with LIBCXX_GENERATE_COVERAGE")
-endif()
-
 if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
     if (APPLE)
       message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT cannot be used on APPLE targets")
@@ -490,12 +480,6 @@ endif()
 # Configure compiler.
 include(config-ix)
 
-# Configure coverage options.
-if (LIBCXX_GENERATE_COVERAGE)
-  include(CodeCoverage)
-  set(CMAKE_BUILD_TYPE "COVERAGE" CACHE STRING "" FORCE)
-endif()
-
 #===============================================================================
 # Setup Compiler Flags
 #===============================================================================

libcxx/cmake/Modules/CodeCoverage.cmake

@@ -147,11 +147,6 @@ if(NOT LIBCXX_INSTALL_LIBRARY)
   set(exclude_from_all EXCLUDE_FROM_ALL)
 endif()
 
-if (LIBCXX_GENERATE_COVERAGE AND NOT LIBCXX_COVERAGE_LIBRARY)
-  find_compiler_rt_library(profile LIBCXX_COVERAGE_LIBRARY)
-endif()
-add_library_flags_if(LIBCXX_COVERAGE_LIBRARY "${LIBCXX_COVERAGE_LIBRARY}")
-
 if (APPLE AND LLVM_USE_SANITIZER)
   if (("${LLVM_USE_SANITIZER}" STREQUAL "Address") OR
       ("${LLVM_USE_SANITIZER}" STREQUAL "Address;Undefined") OR

libcxx/src/CMakeLists.txt

@@ -49,15 +49,3 @@ add_lit_testsuite(check-cxx
   "Running libcxx tests"
   ${CMAKE_CURRENT_BINARY_DIR}
   DEPENDS cxx-test-depends)
-
-if (LIBCXX_GENERATE_COVERAGE)
-  include(CodeCoverage)
-  set(output_dir "${CMAKE_CURRENT_BINARY_DIR}/coverage")
-  set(capture_dirs
-      "${LIBCXX_LIB_CMAKEFILES_DIR}/cxx_objects.dir/"
-      "${LIBCXX_LIB_CMAKEFILES_DIR}/cxx.dir/"
-      "${LIBCXX_LIB_CMAKEFILES_DIR}/cxx_experimental.dir/"
-      "${CMAKE_CURRENT_BINARY_DIR}")
-  set(extract_dirs "${LIBCXX_SOURCE_DIR}/include;${LIBCXX_SOURCE_DIR}/src")
-  setup_lcov_test_target_coverage("cxx" "${output_dir}" "${capture_dirs}" "${extract_dirs}")
-endif()