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# CodeCoverageGCOV.cmake
#
# Adds options ENABLE_CODE_COVERAGE, which builds the project with
# code coverage support
#
# It sets variables:
# CODE_COVERAGE_DEFINES - to be used with target_compile_definitions() and similar
# CODE_COVERAGE_CFLAGS - to be used with target_compile_options() and similar for C code
# CODE_COVERAGE_CXXFLAGS - to be used with target_compile_options() and similar for C++ code
# CODE_COVERAGE_LDFLAGS - to be used with target_link_libraries() and similar
#
# These variables should be added as the last in the options, because they change compilation
include(CheckLibraryExists)
include(PrintableOptions)
add_printable_option(ENABLE_CODE_COVERAGE "Enable build with GCOV code coverage" OFF)
if(ENABLE_CODE_COVERAGE)
if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
CHECK_LIBRARY_EXISTS("gcov" "gcov_exit" "" HAVE_GCOV_LIBRARY)
if(HAVE_GCOV_LIBRARY)
set(CODE_COVERAGE_CFLAGS "-O0 -g -fprofile-arcs -ftest-coverage")
set(CODE_COVERAGE_LDFLAGS "-lgcov")
add_definitions(-DNDEBUG)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CODE_COVERAGE_CFLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CODE_COVERAGE_CFLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CODE_COVERAGE_LDFLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${CODE_COVERAGE_LDFLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CODE_COVERAGE_LDFLAGS}")
set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} ${CODE_COVERAGE_LDFLAGS}")
else(HAVE_GCOV_LIBRARY)
message(FATAL_ERROR "Cannot fing gcov library, use -DENABLE_CODE_COVERAGE=OFF disable it")
endif(HAVE_GCOV_LIBRARY)
else("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
message(FATAL_ERROR "Code coverage requires gcc compiler, use -DENABLE_CODE_COVERAGE=OFF disable it")
endif("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
else(ENABLE_CODE_COVERAGE)
set(CODE_COVERAGE_DEFINES "")
set(CODE_COVERAGE_CFLAGS "")
set(CODE_COVERAGE_CXXFLAGS "")
set(CODE_COVERAGE_LDFLAGS "")
endif(ENABLE_CODE_COVERAGE)
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