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Fix handling of external fmt lib

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Using an external fmt lib should cause the spdlog::spdlog target to have
a dependency on fmt lib - so that a consuming project does not need
to call find_package(fmt) and target_link_libraries(... fmt::fmt).

To this end a new cmake option SPDLOG_FMT_EXTERNAL is introduced which
makes spdlog depend on fmt lib and defines the SPDLOG_FMT_EXTERNAL macro
to avoid using the bundled fmt lib. The value of SPDLOG_FMT_EXTERNAL is
also stored in the installed spdlogConfig.cmake and if it is ON
find_dependency() is used to ensure the fmt::fmt target is imported.
This commit is contained in:
Carsten Neumann 2018-12-17 10:18:16 -06:00
parent 57e2193432
commit 084bc72d90
2 changed files with 26 additions and 7 deletions
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26
CMakeLists.txt
View File

@ -53,7 +53,11 @@ endif()
option(SPDLOG_BUILD_EXAMPLES "Build examples" ${SPDLOG_MASTER_PROJECT})
option(SPDLOG_BUILD_BENCH "Build benchmarks" ${SPDLOG_MASTER_PROJECT})
option(SPDLOG_BUILD_TESTS "Build tests" ${SPDLOG_MASTER_PROJECT})
option(SPDLOG_FMT_EXTERNAL "Use external fmt library instead of bundled" OFF)
if(SPDLOG_FMT_EXTERNAL)
find_package(fmt REQUIRED CONFIG)
endif()
target_include_directories(
spdlog
@ -62,6 +66,11 @@ target_include_directories(
"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
)
if(SPDLOG_FMT_EXTERNAL)
target_compile_definitions(spdlog INTERFACE SPDLOG_FMT_EXTERNAL)
target_link_libraries(spdlog INTERFACE fmt::fmt)
endif()
set(HEADER_BASE "${CMAKE_CURRENT_SOURCE_DIR}/include")
if(SPDLOG_BUILD_EXAMPLES)
@ -85,7 +94,8 @@ set(config_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
set(include_install_dir "${CMAKE_INSTALL_INCLUDEDIR}")
set(pkgconfig_install_dir "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
set(version_config "${CMAKE_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
set(project_config "${PROJECT_NAME}Config.cmake")
set(project_config "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake")
set(targets_config "${PROJECT_NAME}Targets.cmake")
set(pkg_config "${CMAKE_BINARY_DIR}/${PROJECT_NAME}.pc")
set(targets_export_name "${PROJECT_NAME}Targets")
set(namespace "${PROJECT_NAME}::")
@ -98,6 +108,8 @@ write_basic_package_version_file(
# configure pkg config file
configure_file("cmake/spdlog.pc.in" "${pkg_config}" @ONLY)
# configure spdlogConfig.cmake file
configure_file("cmake/Config.cmake.in" "${project_config}" @ONLY)
# install targets
install(
@ -111,9 +123,9 @@ install(
DESTINATION "${include_install_dir}"
)
# install project version file
# install project config and version file
install(
FILES "${version_config}"
FILES "${project_config}" "${version_config}"
DESTINATION "${config_install_dir}"
)
@ -123,19 +135,19 @@ install(
DESTINATION "${pkgconfig_install_dir}"
)
# install project config file
# install targets config file
install(
EXPORT "${targets_export_name}"
NAMESPACE "${namespace}"
DESTINATION "${config_install_dir}"
FILE ${project_config}
FILE ${targets_config}
)
# export build directory config file
# export build directory targets file
export(
EXPORT ${targets_export_name}
NAMESPACE "${namespace}"
FILE ${project_config}
FILE ${targets_config}
)
# register project in CMake user registry

7
cmake/Config.cmake.in
View File

@ -21,4 +21,11 @@
# * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
# *************************************************************************/
set(SPDLOG_FMT_EXTERNAL @SPDLOG_FMT_EXTERNAL@)
include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")
if(SPDLOG_FMT_EXTERNAL)
include(CMakeFindDependencyMacro)
find_dependency(fmt CONFIG)
endif()