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cmake_minimum_required(VERSION 3.0)
get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
if(NOT _isMultiConfig AND NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Debug CACHE STRING "Choose the type of build" FORCE)
endif()
project(ConfigSources CXX)
if("${CMAKE_CXX_COMPILER_ID};${CMAKE_CXX_SIMULATE_ID}" STREQUAL "Intel;MSVC")
string(APPEND CMAKE_CXX_FLAGS_DEBUG " -Z7")
string(APPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO " -Z7")
endif()
# Source file(s) named with the configuration(s).
file(GENERATE
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/config_$<CONFIG>.cpp"
CONTENT [[
#if defined(_WIN32) && defined(OBJ_SHARED)
__declspec(dllexport)
#endif
void config_$<CONFIG>() {}
]]
)
# Custom command outputs named with the configuration(s).
add_custom_command(
OUTPUT "custom1_$<CONFIG>.cpp"
COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/custom1.cpp.in" "custom1_$<CONFIG>.cpp"
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/custom1.cpp.in
VERBATIM
)
# Output path starts in a generator expression.
add_custom_command(
OUTPUT "$<1:custom2_$<CONFIG>.cpp>"
COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/custom2.cpp.in" "custom2_$<CONFIG>.cpp"
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/custom2.cpp.in
VERBATIM
)
# Source file generated as a custom command's byproduct.
add_custom_command(
OUTPUT custom3.txt
BYPRODUCTS "$<1:custom3_$<CONFIG>.cpp>"
COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/custom3.cpp.in" "custom3_$<CONFIG>.cpp"
COMMAND ${CMAKE_COMMAND} -E touch custom3.txt
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/custom3.cpp.in
VERBATIM
)
# Source file generated as a custom target's byproduct.
add_custom_target(custom4
BYPRODUCTS "custom4_$<CONFIG>.cpp"
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_SOURCE_DIR}/custom4.cpp.in" "custom4_$<CONFIG>.cpp"
VERBATIM
)
# Source file generated by appended custom command.
add_custom_command(
OUTPUT "custom5_$<CONFIG>.cpp"
COMMAND ${CMAKE_COMMAND} -E echo custom5_$<CONFIG>.cpp
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/custom5.cpp.in
VERBATIM
)
add_custom_command(APPEND
OUTPUT "custom5_$<CONFIG>.cpp"
COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/custom5.cpp.in" "custom5_$<CONFIG>.cpp.in"
VERBATIM
)
# Appending through any configuration's output affects all configurations.
if(CMAKE_CONFIGURATION_TYPES MATCHES ";([^;]+)$")
set(last_config "${CMAKE_MATCH_1}")
else()
set(last_config ${CMAKE_BUILD_TYPE})
endif()
add_custom_command(APPEND
OUTPUT "custom5_${last_config}.cpp"
COMMAND ${CMAKE_COMMAND} -E copy "custom5_$<CONFIG>.cpp.in" "custom5_$<CONFIG>.cpp"
VERBATIM
)
foreach(n RANGE 1 5)
foreach(other ${CMAKE_BUILD_TYPE} Release RelWithDebInfo MinSizeRel)
set_property(SOURCE custom${n}_${other}.cpp PROPERTY COMPILE_DEFINITIONS CUSTOM_CFG_OTHER)
endforeach()
set_property(SOURCE custom${n}_Debug.cpp PROPERTY COMPILE_DEFINITIONS CUSTOM_CFG_DEBUG)
endforeach()
add_library(Custom STATIC
custom1_$<CONFIG>.cpp
custom2_$<CONFIG>.cpp
custom3_$<CONFIG>.cpp custom3.txt
custom4_$<CONFIG>.cpp
custom5_$<CONFIG>.cpp
)
# Per-config sources via INTERFACE_SOURCES.
add_library(iface INTERFACE)
target_sources(iface INTERFACE
"${CMAKE_CURRENT_SOURCE_DIR}/iface_src.cpp"
"$<$<CONFIG:Debug>:${CMAKE_CURRENT_SOURCE_DIR}/iface_debug_src.cpp>"
"$<$<NOT:$<CONFIG:Debug>>:${CMAKE_CURRENT_SOURCE_DIR}/iface_other_src.cpp>"
"$<$<CONFIG:NotAConfig>:${CMAKE_CURRENT_SOURCE_DIR}/does_not_exist.cpp>"
)
target_compile_definitions(iface INTERFACE
"$<$<CONFIG:Debug>:CFG_DEBUG>"
"$<$<NOT:$<CONFIG:Debug>>:CFG_OTHER>"
)
add_executable(ConfigSources
$<$<CONFIG:Debug>:main_debug.cpp>
$<$<NOT:$<CONFIG:Debug>>:main_other.cpp>
$<$<CONFIG:NotAConfig>:does_not_exist.cpp>
${CMAKE_CURRENT_BINARY_DIR}/config_$<CONFIG>.cpp
)
target_link_libraries(ConfigSources Custom iface)
# Per-config sources via LINK_LIBRARIES.
add_library(iface_debug INTERFACE)
target_sources(iface_debug INTERFACE
"${CMAKE_CURRENT_SOURCE_DIR}/iface_src.cpp"
"${CMAKE_CURRENT_SOURCE_DIR}/iface_debug_src.cpp"
)
add_library(iface_other INTERFACE)
target_sources(iface_other INTERFACE
"${CMAKE_CURRENT_SOURCE_DIR}/iface_src.cpp"
"${CMAKE_CURRENT_SOURCE_DIR}/iface_other_src.cpp"
)
add_executable(ConfigSourcesLink main.cpp)
target_compile_definitions(ConfigSourcesLink PRIVATE
"$<$<CONFIG:Debug>:CFG_DEBUG>"
"$<$<NOT:$<CONFIG:Debug>>:CFG_OTHER>"
)
target_link_libraries(ConfigSourcesLink PRIVATE
Custom
"$<$<CONFIG:Debug>:iface_debug>"
"$<$<NOT:$<CONFIG:Debug>>:iface_other>"
"$<$<CONFIG:NotAConfig>:iface_does_not_exist>"
)
# Per-config sources via INTERFACE_LINK_LIBRARIES.
add_library(ConfigSourcesIface INTERFACE)
target_link_libraries(ConfigSourcesIface INTERFACE
"$<$<CONFIG:Debug>:iface_debug>"
"$<$<NOT:$<CONFIG:Debug>>:iface_other>"
"$<$<CONFIG:NotAConfig>:iface_does_not_exist>"
)
add_executable(ConfigSourcesLinkIface main.cpp)
target_compile_definitions(ConfigSourcesLinkIface PRIVATE
"$<$<CONFIG:Debug>:CFG_DEBUG>"
"$<$<NOT:$<CONFIG:Debug>>:CFG_OTHER>"
)
target_link_libraries(ConfigSourcesLinkIface Custom ConfigSourcesIface)
# A target with sources in only one configuration that is not the
# first in CMAKE_CONFIGURATION_TYPES.
if(CMAKE_CONFIGURATION_TYPES MATCHES ";([^;]+)")
set(one_config "${CMAKE_MATCH_1}")
else()
set(one_config "${CMAKE_BUILD_TYPE}")
endif()
add_library(OneConfigOnly OBJECT "$<$<CONFIG:${one_config}>:${CMAKE_CURRENT_SOURCE_DIR}/iface_src.cpp>")
set_property(TARGET OneConfigOnly PROPERTY LINKER_LANGUAGE CXX)
# ---------------------------------------------------------------------------
# Makes sure that each configuration uses the correct generated file.
add_library(ObjLibFromGeneratedSources OBJECT)
set_property(TARGET ObjLibFromGeneratedSources PROPERTY POSITION_INDEPENDENT_CODE 1)
target_compile_definitions(ObjLibFromGeneratedSources PRIVATE OBJ_SHARED)
target_sources(ObjLibFromGeneratedSources PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/config_$<CONFIG>.cpp)
add_library(SharedLibFromObjLibFromGeneratedSources SHARED shared.cpp)
target_link_libraries(SharedLibFromObjLibFromGeneratedSources PRIVATE ObjLibFromGeneratedSources)
# ---------------------------------------------------------------------------
# Make sure that additional build-events do not confuse CMake when using generated files.
add_library(SharedLibFromGeneratedSources SHARED)
set_property(TARGET SharedLibFromGeneratedSources PROPERTY POSITION_INDEPENDENT_CODE 1)
target_sources(SharedLibFromGeneratedSources PRIVATE
shared.cpp
${CMAKE_CURRENT_BINARY_DIR}/config_$<CONFIG>.cpp
)
add_custom_command(TARGET SharedLibFromGeneratedSources POST_BUILD
COMMAND "${CMAKE_COMMAND}" "-E" "echo" "$<TARGET_FILE:SharedLibFromGeneratedSources>"
)
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