Add coverage

cmake/default_coverage.cmake

@@ -1,3 +1,6 @@
+include_guard(GLOBAL)
+
+option(COVERAGE "Enable coverage reporting" OFF)
 
 add_library(_DefaultCoverage INTERFACE)
 
@@ -19,6 +22,23 @@ if (COVERAGE)
         $<$<CXX_COMPILER_ID:AppleClang>: --coverage>
     )
 
+    set(COVERAGE_BRANCHES "--rc branch_coverage=1")
+    set(COVERAGE_WARNINGS "--ignore-errors gcov")
+    set(GENHTML_WARNINGS "")
+    if(APPLE)
+        set(COVERAGE_WARNINGS "--ignore-errors gcov --ignore-errors inconsistent --ignore-errors unused --ignore-errors range --ignore-errors empty,empty")
+        set(GENHTML_WARNINGS "--ignore-errors inconsistent")
+    endif()
+    separate_arguments(COVERAGE_BRANCHES)
+    separate_arguments(COVERAGE_WARNINGS)
+    separate_arguments(GENHTML_WARNINGS)
+    add_custom_target(coverage
+        COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/coverage
+        COMMAND lcov  --directory . --capture --output-file ${CMAKE_BINARY_DIR}/coverage/coverage.info ${COVERAGE_WARNINGS} ${COVERAGE_BRANCHES}
+        COMMAND lcov --remove ${CMAKE_BINARY_DIR}/coverage/coverage.info '/usr/*' '*/tests/*' '*/_deps/*' '${CMAKE_SOURCE_DIR}/external/*' --output-file ${CMAKE_BINARY_DIR}/coverage/coverage.info.cleaned ${COVERAGE_WARNINGS} ${COVERAGE_BRANCHES}
+        COMMAND genhtml --branch-coverage ${CMAKE_BINARY_DIR}/coverage/coverage.info.cleaned --output-directory ${CMAKE_BINARY_DIR}/coverage ${GENHTML_WARNINGS} ${COVERAGE_BRANCHES}
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+    )
 endif(COVERAGE)
 
-add_library(default::coverage ALIAS _DefaultCoverage)
+add_library(default::coverage ALIAS _DefaultCoverage)

cmake/testing.cmake

@@ -15,7 +15,7 @@ FetchContent_MakeAvailable(doctest)
 add_library(doctest_main STATIC ${PROJECT_SOURCE_DIR}/tests/test_main.cpp)
 
 set(TEST_FRAMEWORK doctest::doctest)
-set(THIS_PROJECT_LIBS astr)
+set(THIS_PROJECT_LIBS astr default::flags)
 
 target_link_libraries(doctest_main PUBLIC ${TEST_FRAMEWORK})