File: CodeCoverage.cmake

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# Copyright (c) 2012 - 2017, Lars Bilke
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
#    may be used to endorse or promote products derived from this software without
#    specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# CHANGES:
#
# 2012-01-31, Lars Bilke
# - Enable Code Coverage
#
# 2013-09-17, Joakim Söderberg
# - Added support for Clang.
# - Some additional usage instructions.
#
# 2016-02-03, Lars Bilke
# - Refactored functions to use named parameters
#
# 2017-06-02, Lars Bilke
# - Merged with modified version from github.com/ufz/ogs
#
#
# USAGE:
#
# 1. Copy this file into your cmake modules path.
#
# 2. Add the following line to your CMakeLists.txt:
#      include(CodeCoverage)
#
# 3. Append necessary compiler flags:
#      APPEND_COVERAGE_COMPILER_FLAGS()
#
# 4. If you need to exclude additional directories from the report, specify them
#    using the COVERAGE_LCOV_EXCLUDES variable before calling SETUP_TARGET_FOR_COVERAGE_LCOV.
#    Example:
#      set(COVERAGE_LCOV_EXCLUDES 'dir1/*' 'dir2/*')
#
# 5. Use the functions described below to create a custom make target which
#    runs your test executable and produces a code coverage report.
#
# 6. Build a Debug build:
#      cmake -DCMAKE_BUILD_TYPE=Debug ..
#      make
#      make my_coverage_target
#

include(CMakeParseArguments)

# Check prereqs
find_program( GCOV_PATH gcov )
find_program( LCOV_PATH  NAMES lcov lcov.bat lcov.exe lcov.perl)
find_program( GENHTML_PATH NAMES genhtml genhtml.perl genhtml.bat )
find_program( GCOVR_PATH gcovr PATHS ${CMAKE_SOURCE_DIR}/scripts/test)
find_program( SIMPLE_PYTHON_EXECUTABLE python )

if(NOT GCOV_PATH)
    message(FATAL_ERROR "gcov not found! Aborting...")
endif() # NOT GCOV_PATH

if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?[Cc]lang")
    if("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS 3)
        message(FATAL_ERROR "Clang version must be 3.0.0 or greater! Aborting...")
    endif()
elseif(NOT CMAKE_COMPILER_IS_GNUCXX)
    message(FATAL_ERROR "Compiler is not GNU gcc! Aborting...")
endif()

set(COVERAGE_COMPILER_FLAGS "-g -O0 --coverage -fprofile-arcs -ftest-coverage"
    CACHE INTERNAL "")

set(CMAKE_CXX_FLAGS_COVERAGE
    ${COVERAGE_COMPILER_FLAGS}
    CACHE STRING "Flags used by the C++ compiler during coverage builds."
    FORCE )
set(CMAKE_C_FLAGS_COVERAGE
    ${COVERAGE_COMPILER_FLAGS}
    CACHE STRING "Flags used by the C compiler during coverage builds."
    FORCE )
set(CMAKE_EXE_LINKER_FLAGS_COVERAGE
    ""
    CACHE STRING "Flags used for linking binaries during coverage builds."
    FORCE )
set(CMAKE_SHARED_LINKER_FLAGS_COVERAGE
    ""
    CACHE STRING "Flags used by the shared libraries linker during coverage builds."
    FORCE )
mark_as_advanced(
    CMAKE_CXX_FLAGS_COVERAGE
    CMAKE_C_FLAGS_COVERAGE
    CMAKE_EXE_LINKER_FLAGS_COVERAGE
    CMAKE_SHARED_LINKER_FLAGS_COVERAGE )

if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
    message(WARNING "Code coverage results with an optimised (non-Debug) build may be misleading")
endif() # NOT CMAKE_BUILD_TYPE STREQUAL "Debug"

if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    link_libraries(gcov)
else()
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
endif()

# Defines a target for running and collection code coverage information
# Builds dependencies, runs the given executable and outputs reports.
# NOTE! The executable should always have a ZERO as exit code otherwise
# the coverage generation will not complete.
#
# SETUP_TARGET_FOR_COVERAGE_LCOV(
#     NAME testrunner_coverage                    # New target name
#     EXECUTABLE testrunner -j ${PROCESSOR_COUNT} # Executable in PROJECT_BINARY_DIR
#     DEPENDENCIES testrunner                     # Dependencies to build first
# )
function(SETUP_TARGET_FOR_COVERAGE_LCOV)

    set(options NONE)
    set(oneValueArgs NAME)
    set(multiValueArgs EXECUTABLE EXECUTABLE_ARGS DEPENDENCIES)
    cmake_parse_arguments(Coverage "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    if(NOT LCOV_PATH)
        message(FATAL_ERROR "lcov not found! Aborting...")
    endif() # NOT LCOV_PATH

    if(NOT GENHTML_PATH)
        message(FATAL_ERROR "genhtml not found! Aborting...")
    endif() # NOT GENHTML_PATH

    # Setup target
    add_custom_target(${Coverage_NAME}

        # Cleanup lcov
        COMMAND ${LCOV_PATH} --directory . --zerocounters
        # Create baseline to make sure untouched files show up in the report
        COMMAND ${LCOV_PATH} -c -i -d . -o ${Coverage_NAME}.base

        # Run tests
        COMMAND ${Coverage_EXECUTABLE}

        # Capturing lcov counters and generating report
        COMMAND ${LCOV_PATH} --directory . --capture --output-file ${Coverage_NAME}.info
        # add baseline counters
        COMMAND ${LCOV_PATH} -a ${Coverage_NAME}.base -a ${Coverage_NAME}.info --output-file ${Coverage_NAME}.total
        COMMAND ${LCOV_PATH} --remove ${Coverage_NAME}.total ${COVERAGE_LCOV_EXCLUDES} --output-file ${PROJECT_BINARY_DIR}/${Coverage_NAME}.info.cleaned
        COMMAND ${GENHTML_PATH} -o ${Coverage_NAME} ${PROJECT_BINARY_DIR}/${Coverage_NAME}.info.cleaned
        COMMAND ${CMAKE_COMMAND} -E remove ${Coverage_NAME}.base ${Coverage_NAME}.total ${PROJECT_BINARY_DIR}/${Coverage_NAME}.info.cleaned

        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
        DEPENDS ${Coverage_DEPENDENCIES}
        COMMENT "Resetting code coverage counters to zero.\nProcessing code coverage counters and generating report."
    )

    # Show where to find the lcov info report
    add_custom_command(TARGET ${Coverage_NAME} POST_BUILD
        COMMAND ;
        COMMENT "Lcov code coverage info report saved in ${Coverage_NAME}.info."
    )

    # Show info where to find the report
    add_custom_command(TARGET ${Coverage_NAME} POST_BUILD
        COMMAND ;
        COMMENT "Open ./${Coverage_NAME}/index.html in your browser to view the coverage report."
    )

endfunction() # SETUP_TARGET_FOR_COVERAGE_LCOV

# Defines a target for running and collection code coverage information
# Builds dependencies, runs the given executable and outputs reports.
# NOTE! The executable should always have a ZERO as exit code otherwise
# the coverage generation will not complete.
#
# SETUP_TARGET_FOR_COVERAGE_GCOVR_XML(
#     NAME ctest_coverage                    # New target name
#     EXECUTABLE ctest -j ${PROCESSOR_COUNT} # Executable in PROJECT_BINARY_DIR
#     DEPENDENCIES executable_target         # Dependencies to build first
# )
function(SETUP_TARGET_FOR_COVERAGE_GCOVR_XML)

    set(options NONE)
    set(oneValueArgs NAME)
    set(multiValueArgs EXECUTABLE EXECUTABLE_ARGS DEPENDENCIES)
    cmake_parse_arguments(Coverage "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    if(NOT SIMPLE_PYTHON_EXECUTABLE)
        message(FATAL_ERROR "python not found! Aborting...")
    endif() # NOT SIMPLE_PYTHON_EXECUTABLE

    if(NOT GCOVR_PATH)
        message(FATAL_ERROR "gcovr not found! Aborting...")
    endif() # NOT GCOVR_PATH

    # Combine excludes to several -e arguments
    set(GCOVR_EXCLUDES "")
    foreach(EXCLUDE ${COVERAGE_GCOVR_EXCLUDES})
        list(APPEND GCOVR_EXCLUDES "-e")
        list(APPEND GCOVR_EXCLUDES "${EXCLUDE}")
    endforeach()

    add_custom_target(${Coverage_NAME}
        # Run tests
        ${Coverage_EXECUTABLE}

        # Running gcovr
        COMMAND ${GCOVR_PATH} --xml
            -r ${PROJECT_SOURCE_DIR} ${GCOVR_EXCLUDES}
            --object-directory=${PROJECT_BINARY_DIR}
            -o ${Coverage_NAME}.xml
        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
        DEPENDS ${Coverage_DEPENDENCIES}
        COMMENT "Running gcovr to produce Cobertura code coverage report."
    )

    # Show info where to find the report
    add_custom_command(TARGET ${Coverage_NAME} POST_BUILD
        COMMAND ;
        COMMENT "Cobertura code coverage report saved in ${Coverage_NAME}.xml."
    )

endfunction() # SETUP_TARGET_FOR_COVERAGE_GCOVR_XML

# Defines a target for running and collection code coverage information
# Builds dependencies, runs the given executable and outputs reports.
# NOTE! The executable should always have a ZERO as exit code otherwise
# the coverage generation will not complete.
#
# SETUP_TARGET_FOR_COVERAGE_GCOVR_HTML(
#     NAME ctest_coverage                    # New target name
#     EXECUTABLE ctest -j ${PROCESSOR_COUNT} # Executable in PROJECT_BINARY_DIR
#     DEPENDENCIES executable_target         # Dependencies to build first
# )
function(SETUP_TARGET_FOR_COVERAGE_GCOVR_HTML)

    set(options NONE)
    set(oneValueArgs NAME)
    set(multiValueArgs EXECUTABLE EXECUTABLE_ARGS DEPENDENCIES)
    cmake_parse_arguments(Coverage "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    if(NOT SIMPLE_PYTHON_EXECUTABLE)
        message(FATAL_ERROR "python not found! Aborting...")
    endif() # NOT SIMPLE_PYTHON_EXECUTABLE

    if(NOT GCOVR_PATH)
        message(FATAL_ERROR "gcovr not found! Aborting...")
    endif() # NOT GCOVR_PATH

    # Combine excludes to several -e arguments
    set(GCOVR_EXCLUDES "")
    foreach(EXCLUDE ${COVERAGE_GCOVR_EXCLUDES})
        list(APPEND GCOVR_EXCLUDES "-e")
        list(APPEND GCOVR_EXCLUDES "${EXCLUDE}")
    endforeach()

    add_custom_target(${Coverage_NAME}
        # Run tests
        ${Coverage_EXECUTABLE}

        # Create folder
        COMMAND ${CMAKE_COMMAND} -E make_directory ${PROJECT_BINARY_DIR}/${Coverage_NAME}

        # Running gcovr
        COMMAND ${GCOVR_PATH} --html --html-details
            -r ${PROJECT_SOURCE_DIR} ${GCOVR_EXCLUDES}
            --object-directory=${PROJECT_BINARY_DIR}
            -o ${Coverage_NAME}/index.html
        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
        DEPENDS ${Coverage_DEPENDENCIES}
        COMMENT "Running gcovr to produce HTML code coverage report."
    )

    # Show info where to find the report
    add_custom_command(TARGET ${Coverage_NAME} POST_BUILD
        COMMAND ;
        COMMENT "Open ./${Coverage_NAME}/index.html in your browser to view the coverage report."
    )

endfunction() # SETUP_TARGET_FOR_COVERAGE_GCOVR_HTML

function(APPEND_COVERAGE_COMPILER_FLAGS)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COVERAGE_COMPILER_FLAGS}" PARENT_SCOPE)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COVERAGE_COMPILER_FLAGS}" PARENT_SCOPE)
    message(STATUS "Appending code coverage compiler flags: ${COVERAGE_COMPILER_FLAGS}")
endfunction() # APPEND_COVERAGE_COMPILER_FLAGS