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add user-defined build option in CMake

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This commit is contained in:
chenguoping 2020-06-04 21:23:07 +08:00
parent 9212590764
commit dbbdce4671
1 changed files with 13 additions and 1 deletions
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14
CMakeLists.txt
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@ -33,6 +33,7 @@ set(NLOHMANN_JSON_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_BINARY_DIR}")
set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
set(BUILD_CXX_STD "c++11" CACHE STRING "build the library with C++11 standard(-DBUILD_CXX_STD=c++11)")
if (JSON_MultipleHeaders)
set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
@ -42,6 +43,17 @@ else()
message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
endif()
#
## Build Language Standard
#
if (BUILD_CXX_STD STREQUAL "c++11")
set(CXX_STD "cxx_std_11")
elseif (BUILD_CXX_STD STREQUAL "c++14")
set(CXX_STD "cxx_std_14")
elseif (BUILD_CXX_STD STREQUAL "c++17")
set(CXX_STD "cxx_std_17")
endif()
##
## TARGET
## create target and add include path
@ -51,7 +63,7 @@ add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_
if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
else()
target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE ${CXX_STD})
endif()
target_include_directories(