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code-coverage.cmake
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#
# Copyright (C) 2018 by George Cave - [email protected]
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
# USAGE: To enable any code coverage instrumentation/targets, the single CMake
# option of `CODE_COVERAGE` needs to be set to 'ON', either by GUI, ccmake, or
# on the command line.
#
# From this point, there are two primary methods for adding instrumentation to
# targets: 1 - A blanket instrumentation by calling `add_code_coverage()`, where
# all targets in that directory and all subdirectories are automatically
# instrumented. 2 - Per-target instrumentation by calling
# `target_code_coverage(<TARGET_NAME>)`, where the target is given and thus only
# that target is instrumented. This applies to both libraries and executables.
#
# To add coverage targets, such as calling `make ccov` to generate the actual
# coverage information for perusal or consumption, call
# `target_code_coverage(<TARGET_NAME>)` on an *executable* target.
#
# Example 1: All targets instrumented
#
# In this case, the coverage information reported will will be that of the
# `theLib` library target and `theExe` executable.
#
# 1a: Via global command
#
# ~~~
# add_code_coverage() # Adds instrumentation to all targets
#
# add_library(theLib lib.cpp)
#
# add_executable(theExe main.cpp)
# target_link_libraries(theExe PRIVATE theLib)
# target_code_coverage(theExe) # As an executable target, adds the 'ccov-theExe' target (instrumentation already added via global anyways) for generating code coverage reports.
# ~~~
#
# 1b: Via target commands
#
# ~~~
# add_library(theLib lib.cpp)
# target_code_coverage(theLib) # As a library target, adds coverage instrumentation but no targets.
#
# add_executable(theExe main.cpp)
# target_link_libraries(theExe PRIVATE theLib)
# target_code_coverage(theExe) # As an executable target, adds the 'ccov-theExe' target and instrumentation for generating code coverage reports.
# ~~~
#
# Example 2: Target instrumented, but with regex pattern of files to be excluded
# from report
#
# ~~~
# add_executable(theExe main.cpp non_covered.cpp)
# target_code_coverage(theExe EXCLUDE non_covered.cpp test/*) # As an executable target, the reports will exclude the non-covered.cpp file, and any files in a test/ folder.
# ~~~
#
# Example 3: Target added to the 'ccov' and 'ccov-all' targets
#
# ~~~
# add_code_coverage_all_targets(EXCLUDE test/*) # Adds the 'ccov-all' target set and sets it to exclude all files in test/ folders.
#
# add_executable(theExe main.cpp non_covered.cpp)
# target_code_coverage(theExe AUTO ALL EXCLUDE non_covered.cpp test/*) # As an executable target, adds to the 'ccov' and ccov-all' targets, and the reports will exclude the non-covered.cpp file, and any files in a test/ folder.
# ~~~
# Options
option(
CODE_COVERAGE
"Builds targets with code coverage instrumentation. (Requires GCC or Clang)"
OFF)
# Programs
find_program(LLVM_COV_PATH llvm-cov)
find_program(LLVM_PROFDATA_PATH llvm-profdata)
find_program(LCOV_PATH lcov)
find_program(GENHTML_PATH genhtml)
# Variables
set(CMAKE_COVERAGE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/ccov)
# Common initialization/checks
if(CODE_COVERAGE AND NOT CODE_COVERAGE_ADDED)
set(CODE_COVERAGE_ADDED ON)
# Common Targets
add_custom_target(
ccov-preprocessing
COMMAND ${CMAKE_COMMAND} -E make_directory
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}
DEPENDS ccov-clean)
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
# Messages
message(STATUS "Building with llvm Code Coverage Tools")
if(NOT LLVM_COV_PATH)
message(FATAL_ERROR "llvm-cov not found! Aborting.")
else()
# Version number checking for 'EXCLUDE' compatibility
execute_process(COMMAND ${LLVM_COV_PATH} --version
OUTPUT_VARIABLE LLVM_COV_VERSION_CALL_OUTPUT)
string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" LLVM_COV_VERSION
${LLVM_COV_VERSION_CALL_OUTPUT})
if(LLVM_COV_VERSION VERSION_LESS "7.0.0")
message(
WARNING
"target_code_coverage()/add_code_coverage_all_targets() 'EXCLUDE' option only available on llvm-cov >= 7.0.0"
)
endif()
endif()
# Targets
add_custom_target(
ccov-clean
COMMAND rm -f ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list
COMMAND rm -f ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/profraw.list)
# Used to get the shared object file list before doing the main all-
# processing
add_custom_target(
ccov-libs
COMMAND ;
COMMENT "libs ready for coverage report.")
elseif(CMAKE_COMPILER_IS_GNUCXX)
# Messages
message(STATUS "Building with lcov Code Coverage Tools")
if(CMAKE_BUILD_TYPE)
string(TOUPPER ${CMAKE_BUILD_TYPE} upper_build_type)
if(NOT ${upper_build_type} STREQUAL "DEBUG")
message(
WARNING
"Code coverage results with an optimized (non-Debug) build may be misleading"
)
endif()
else()
message(
WARNING
"Code coverage results with an optimized (non-Debug) build may be misleading"
)
endif()
if(NOT LCOV_PATH)
message(FATAL_ERROR "lcov not found! Aborting...")
endif()
if(NOT GENHTML_PATH)
message(FATAL_ERROR "genhtml not found! Aborting...")
endif()
# Targets
add_custom_target(ccov-clean COMMAND ${LCOV_PATH} --directory
${CMAKE_BINARY_DIR} --zerocounters)
else()
message(FATAL_ERROR "Code coverage requires Clang or GCC. Aborting.")
endif()
endif()
# Adds code coverage instrumentation to a library, or instrumentation/targets
# for an executable target.
# ~~~
# EXECUTABLE ADDED TARGETS:
# GCOV/LCOV:
# ccov : Generates HTML code coverage report for every target added with 'AUTO' parameter.
# ccov-${TARGET_NAME} : Generates HTML code coverage report for the associated named target.
# ccov-all : Generates HTML code coverage report, merging every target added with 'ALL' parameter into a single detailed report.
#
# LLVM-COV:
# ccov : Generates HTML code coverage report for every target added with 'AUTO' parameter.
# ccov-report : Generates HTML code coverage report for every target added with 'AUTO' parameter.
# ccov-${TARGET_NAME} : Generates HTML code coverage report.
# ccov-report-${TARGET_NAME} : Prints to command line summary per-file coverage information.
# ccov-show-${TARGET_NAME} : Prints to command line detailed per-line coverage information.
# ccov-all : Generates HTML code coverage report, merging every target added with 'ALL' parameter into a single detailed report.
# ccov-all-report : Prints summary per-file coverage information for every target added with ALL' parameter to the command line.
#
# Required:
# TARGET_NAME - Name of the target to generate code coverage for.
# Optional:
# AUTO - Adds the target to the 'ccov' target so that it can be run in a batch with others easily. Effective on executable targets.
# ALL - Adds the target to the 'ccov-all' and 'ccov-all-report' targets, which merge several executable targets coverage data to a single report. Effective on executable targets.
# EXTERNAL - For GCC's lcov, allows the profiling of 'external' files from the processing directory
# COVERAGE_TARGET_NAME - For executables ONLY, changes the outgoing target name so instead of `ccov-${TARGET_NAME}` it becomes `ccov-${COVERAGE_TARGET_NAME}`.
# EXCLUDE <REGEX_PATTERNS> - Excludes files of the patterns provided from coverage. **These do not copy to the 'all' targets.**
# OBJECTS <TARGETS> - For executables ONLY, if the provided targets are shared libraries, adds coverage information to the output
# ARGS <ARGUMENTS> - For executables ONLY, append sthe given arguments to the associated ccov-* executable call
# ~~~
function(target_code_coverage TARGET_NAME)
# Argument parsing
set(options AUTO ALL EXTERNAL)
set(single_value_keywords COVERAGE_TARGET_NAME)
set(multi_value_keywords EXCLUDE OBJECTS ARGS)
cmake_parse_arguments(
target_code_coverage "${options}" "${single_value_keywords}"
"${multi_value_keywords}" ${ARGN})
if(NOT target_code_coverage_COVERAGE_TARGET_NAME)
# If a specific name was given, use that instead.
set(target_code_coverage_COVERAGE_TARGET_NAME ${TARGET_NAME})
endif()
message(
STATUS
"For the target ${target_code_coverage_COVERAGE_TARGET_NAME}, these are the arguments given to use: ${target_code_coverage_ARGS}"
)
if(CODE_COVERAGE)
# Add code coverage instrumentation to the target's linker command
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
target_compile_options(${TARGET_NAME} PRIVATE -fprofile-instr-generate
-fcoverage-mapping)
set_property(
TARGET ${TARGET_NAME}
APPEND_STRING
PROPERTY LINK_FLAGS "-fprofile-instr-generate ")
set_property(
TARGET ${TARGET_NAME}
APPEND_STRING
PROPERTY LINK_FLAGS "-fcoverage-mapping ")
elseif(CMAKE_COMPILER_IS_GNUCXX)
target_compile_options(${TARGET_NAME} PRIVATE -fprofile-arcs
-ftest-coverage)
target_link_libraries(${TARGET_NAME} PRIVATE gcov)
endif()
# Targets
get_target_property(target_type ${TARGET_NAME} TYPE)
# Add shared library to processing for 'all' targets
if(target_type STREQUAL "SHARED_LIBRARY" AND target_code_coverage_ALL)
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
add_custom_target(
ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND echo "-object=$<TARGET_FILE:${TARGET_NAME}>" >>
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list
DEPENDS ccov-preprocessing ${TARGET_NAME})
if(NOT TARGET ccov-libs)
message(
FATAL_ERROR
"Calling target_code_coverage with 'ALL' must be after a call to 'add_code_coverage_all_targets'."
)
endif()
add_dependencies(ccov-libs
ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME})
endif()
endif()
# For executables add targets to run and produce output
if(target_type STREQUAL "EXECUTABLE")
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
# If there are shared objects to also work with, generate the string to
# add them here
foreach(SO_TARGET ${target_code_coverage_OBJECTS})
# Check to see if the target is a shared object
if(TARGET ${SO_TARGET})
get_target_property(SO_TARGET_TYPE ${SO_TARGET} TYPE)
if(${SO_TARGET_TYPE} STREQUAL "SHARED_LIBRARY")
set(SO_OBJECTS ${SO_OBJECTS} -object=$<TARGET_FILE:${SO_TARGET}>)
endif()
endif()
endforeach()
# Run the executable, generating raw profile data
add_custom_target(
ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND
LLVM_PROFILE_FILE=${target_code_coverage_COVERAGE_TARGET_NAME}.profraw
$<TARGET_FILE:${TARGET_NAME}> ${target_code_coverage_ARGS}
COMMAND echo "-object=$<TARGET_FILE:${TARGET_NAME}>" >>
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list
COMMAND
echo
"${CMAKE_CURRENT_BINARY_DIR}/${target_code_coverage_COVERAGE_TARGET_NAME}.profraw "
>> ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/profraw.list
DEPENDS ccov-preprocessing ccov-libs ${TARGET_NAME})
# Merge the generated profile data so llvm-cov can process it
add_custom_target(
ccov-processing-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND ${LLVM_PROFDATA_PATH} merge -sparse
${target_code_coverage_COVERAGE_TARGET_NAME}.profraw -o
${target_code_coverage_COVERAGE_TARGET_NAME}.profdata
DEPENDS ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME})
# Ignore regex only works on LLVM >= 7
if(LLVM_COV_VERSION VERSION_GREATER_EQUAL "7.0.0")
foreach(EXCLUDE_ITEM ${target_code_coverage_EXCLUDE})
set(EXCLUDE_REGEX ${EXCLUDE_REGEX}
-ignore-filename-regex='${EXCLUDE_ITEM}')
endforeach()
endif()
# Print out details of the coverage information to the command line
add_custom_target(
ccov-show-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND
${LLVM_COV_PATH} show $<TARGET_FILE:${TARGET_NAME}> ${SO_OBJECTS}
-instr-profile=${target_code_coverage_COVERAGE_TARGET_NAME}.profdata
-show-line-counts-or-regions ${EXCLUDE_REGEX}
DEPENDS ccov-processing-${target_code_coverage_COVERAGE_TARGET_NAME})
# Print out a summary of the coverage information to the command line
add_custom_target(
ccov-report-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND
${LLVM_COV_PATH} report $<TARGET_FILE:${TARGET_NAME}> ${SO_OBJECTS}
-instr-profile=${target_code_coverage_COVERAGE_TARGET_NAME}.profdata
${EXCLUDE_REGEX}
DEPENDS ccov-processing-${target_code_coverage_COVERAGE_TARGET_NAME})
# Generates HTML output of the coverage information for perusal
add_custom_target(
ccov-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND
${LLVM_COV_PATH} show $<TARGET_FILE:${TARGET_NAME}> ${SO_OBJECTS}
-instr-profile=${target_code_coverage_COVERAGE_TARGET_NAME}.profdata
-show-line-counts-or-regions
-output-dir=${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}
-format="html" ${EXCLUDE_REGEX}
DEPENDS ccov-processing-${target_code_coverage_COVERAGE_TARGET_NAME})
elseif(CMAKE_COMPILER_IS_GNUCXX)
set(COVERAGE_INFO
"${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}.info"
)
# Run the executable, generating coverage information
add_custom_target(
ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND $<TARGET_FILE:${TARGET_NAME}> ${target_code_coverage_ARGS}
DEPENDS ccov-preprocessing ${TARGET_NAME})
# Generate exclusion string for use
foreach(EXCLUDE_ITEM ${target_code_coverage_EXCLUDE})
set(EXCLUDE_REGEX ${EXCLUDE_REGEX} --remove ${COVERAGE_INFO}
'${EXCLUDE_ITEM}')
endforeach()
if(EXCLUDE_REGEX)
set(EXCLUDE_COMMAND ${LCOV_PATH} ${EXCLUDE_REGEX} --output-file
${COVERAGE_INFO})
else()
set(EXCLUDE_COMMAND ;)
endif()
if(NOT ${target_code_coverage_EXTERNAL})
set(EXTERNAL_OPTION --no-external)
endif()
# Capture coverage data
add_custom_target(
ccov-capture-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND ${CMAKE_COMMAND} -E remove ${COVERAGE_INFO}
COMMAND ${LCOV_PATH} --directory ${CMAKE_BINARY_DIR} --zerocounters
COMMAND $<TARGET_FILE:${TARGET_NAME}> ${target_code_coverage_ARGS}
COMMAND
${LCOV_PATH} --directory ${CMAKE_BINARY_DIR} --base-directory
${CMAKE_SOURCE_DIR} --capture ${EXTERNAL_OPTION} --output-file
${COVERAGE_INFO}
COMMAND ${EXCLUDE_COMMAND}
DEPENDS ccov-preprocessing ${TARGET_NAME})
# Generates HTML output of the coverage information for perusal
add_custom_target(
ccov-${target_code_coverage_COVERAGE_TARGET_NAME}
COMMAND
${GENHTML_PATH} -o
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}
${COVERAGE_INFO}
DEPENDS ccov-capture-${target_code_coverage_COVERAGE_TARGET_NAME})
endif()
add_custom_command(
TARGET ccov-${target_code_coverage_COVERAGE_TARGET_NAME}
POST_BUILD
COMMAND ;
COMMENT
"Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}/index.html in your browser to view the coverage report."
)
# AUTO
if(target_code_coverage_AUTO)
if(NOT TARGET ccov)
add_custom_target(ccov)
endif()
add_dependencies(ccov ccov-${target_code_coverage_COVERAGE_TARGET_NAME})
if(NOT CMAKE_COMPILER_IS_GNUCXX)
if(NOT TARGET ccov-report)
add_custom_target(ccov-report)
endif()
add_dependencies(
ccov-report
ccov-report-${target_code_coverage_COVERAGE_TARGET_NAME})
endif()
endif()
# ALL
if(target_code_coverage_ALL)
if(NOT TARGET ccov-all-processing)
message(
FATAL_ERROR
"Calling target_code_coverage with 'ALL' must be after a call to 'add_code_coverage_all_targets'."
)
endif()
add_dependencies(ccov-all-processing
ccov-run-${target_code_coverage_COVERAGE_TARGET_NAME})
endif()
endif()
endif()
endfunction()
# Adds code coverage instrumentation to all targets in the current directory and
# any subdirectories. To add coverage instrumentation to only specific targets,
# use `target_code_coverage`.
function(add_code_coverage)
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
add_compile_options(-fprofile-instr-generate -fcoverage-mapping)
add_link_options(-fprofile-instr-generate -fcoverage-mapping)
elseif(CMAKE_COMPILER_IS_GNUCXX)
add_compile_options(-fprofile-arcs -ftest-coverage)
link_libraries(gcov)
endif()
endfunction()
# Adds the 'ccov-all' type targets that calls all targets added via
# `target_code_coverage` with the `ALL` parameter, but merges all the coverage
# data from them into a single large report instead of the numerous smaller
# reports. Also adds the ccov-all-capture Generates an all-merged.info file, for
# use with coverage dashboards (e.g. codecov.io, coveralls).
# ~~~
# Optional:
# EXCLUDE <REGEX_PATTERNS> - Excludes files of the regex patterns provided from coverage.
# ~~~
function(add_code_coverage_all_targets)
# Argument parsing
set(multi_value_keywords EXCLUDE)
cmake_parse_arguments(add_code_coverage_all_targets "" ""
"${multi_value_keywords}" ${ARGN})
if(CODE_COVERAGE)
if(CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang"
OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
# Merge the profile data for all of the run executables
add_custom_target(
ccov-all-processing
COMMAND
${LLVM_PROFDATA_PATH} merge -o
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged.profdata -sparse `cat
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/profraw.list`)
# Regex exclude only available for LLVM >= 7
if(LLVM_COV_VERSION VERSION_GREATER_EQUAL "7.0.0")
foreach(EXCLUDE_ITEM ${add_code_coverage_all_targets_EXCLUDE})
set(EXCLUDE_REGEX ${EXCLUDE_REGEX}
-ignore-filename-regex='${EXCLUDE_ITEM}')
endforeach()
endif()
# Print summary of the code coverage information to the command line
add_custom_target(
ccov-all-report
COMMAND
${LLVM_COV_PATH} report `cat
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list`
-instr-profile=${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged.profdata
${EXCLUDE_REGEX}
DEPENDS ccov-all-processing)
# Export coverage information so continuous integration tools (e.g.
# Jenkins) can consume it
add_custom_target(
ccov-all-export
COMMAND
${LLVM_COV_PATH} export `cat
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list`
-instr-profile=${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged.profdata
-format="text" ${EXCLUDE_REGEX} >
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/coverage.json
DEPENDS ccov-all-processing)
# Generate HTML output of all added targets for perusal
add_custom_target(
ccov-all
COMMAND
${LLVM_COV_PATH} show `cat
${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/binaries.list`
-instr-profile=${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged.profdata
-show-line-counts-or-regions
-output-dir=${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged
-format="html" ${EXCLUDE_REGEX}
DEPENDS ccov-all-processing)
elseif(CMAKE_COMPILER_IS_GNUCXX)
set(COVERAGE_INFO "${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged.info")
# Nothing required for gcov
add_custom_target(ccov-all-processing COMMAND ;)
# Exclusion regex string creation
foreach(EXCLUDE_ITEM ${add_code_coverage_all_targets_EXCLUDE})
set(EXCLUDE_REGEX ${EXCLUDE_REGEX} --remove ${COVERAGE_INFO}
'${EXCLUDE_ITEM}')
endforeach()
if(EXCLUDE_REGEX)
set(EXCLUDE_COMMAND ${LCOV_PATH} ${EXCLUDE_REGEX} --output-file
${COVERAGE_INFO})
else()
set(EXCLUDE_COMMAND ;)
endif()
# Capture coverage data
add_custom_target(
ccov-all-capture
COMMAND ${CMAKE_COMMAND} -E remove ${COVERAGE_INFO}
COMMAND ${LCOV_PATH} --directory ${CMAKE_BINARY_DIR} --capture
--output-file ${COVERAGE_INFO}
COMMAND ${EXCLUDE_COMMAND}
DEPENDS ccov-all-processing)
# Generates HTML output of all targets for perusal
add_custom_target(
ccov-all
COMMAND ${GENHTML_PATH} -o ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged
${COVERAGE_INFO}
DEPENDS ccov-all-capture)
endif()
add_custom_command(
TARGET ccov-all
POST_BUILD
COMMAND ;
COMMENT
"Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged/index.html in your browser to view the coverage report."
)
endif()
endfunction()