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upgrades to cmake 2.8.12 and adds config and export support

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This commit upgrades cmake to 2.8.12 to implement proper cmake
`find_package` support using config and export file generation.
Having this support enables users to use installed cppformat
with a simple `find_package` call. Directly using a version
from a build directory is also supported.

main.cpp:
```
 #include <cppformat/format.h>
int main(int argc, char** argv)
{
  for(int i = 0; i < argc; ++i)
    fmt::print("{}: {}\n",i,argv[i]);
  return 0;
}

```

CMakeLists.txt:
```
cmake_minimum_required(VERSION 2.8.12)

project(cppformat-test)

find_package(cppformat REQUIRED)

add_executable(cppformat-test "main.cpp")
target_link_libraries(cppformat-test cppformat)

```
Configuring when cppformat is installed under `CMAKE_INSTALL_PREFIX`: `cmake <PATH_TO_TEST_SRC>`

Configuring when cppformat is installed `ELSEWHERE`: `cmake -Dcppformat_DIR=<ELSEWHERE>/lib/cmake/cppformat <PATH_TO_TEST_SRC>`

Configuring when cppformat is only built: `cmake -Dcppformat_DIR=<cppformat_BUILD_DIR> <PATH_TO_TEST_SRC>`
This commit is contained in:
Mario Werner 2016-01-11 19:01:49 +01:00
parent 97e9ed11bc
commit daf74ae0b1
2 changed files with 45 additions and 4 deletions
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45
CMakeLists.txt
View File

@ -1,6 +1,6 @@
message(STATUS "CMake version: ${CMAKE_VERSION}") message(STATUS "CMake version: ${CMAKE_VERSION}")
cmake_minimum_required(VERSION 2.6) cmake_minimum_required(VERSION 2.8.12)
# Set the default CMAKE_BUILD_TYPE to Release. # Set the default CMAKE_BUILD_TYPE to Release.
# This should be done before the project command since the latter can set # This should be done before the project command since the latter can set
@ -163,8 +163,45 @@ endif ()
# Install targets. # Install targets.
if (FMT_INSTALL) if (FMT_INSTALL)
set(FMT_LIB_DIR lib CACHE STRING include(CMakePackageConfigHelpers)
set(config_install_dir "lib/cmake/cppformat")
set(version_config "${CMAKE_CURRENT_BINARY_DIR}/cppformatConfigVersion.cmake")
set(project_config "${CMAKE_CURRENT_BINARY_DIR}/cppformatConfig.cmake")
set(targets_export_name "cppformatTargets")
set(FMT_LIB_DIR "lib" CACHE STRING
"Installation directory for libraries, relative to ${CMAKE_INSTALL_PREFIX}.") "Installation directory for libraries, relative to ${CMAKE_INSTALL_PREFIX}.")
install(TARGETS cppformat DESTINATION ${FMT_LIB_DIR})
install(FILES format.h DESTINATION include/cppformat) # copy the header into the build directory to mimic the installed tree
configure_file("format.h" "cppformat/format.h" COPYONLY)
# add the include directories for both build and install tree
target_include_directories(
cppformat PUBLIC
$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
$<INSTALL_INTERFACE:include>
)
# generate the version, config and target files into the build directory
write_basic_package_version_file(
"${version_config}"
VERSION ${CPPFORMAT_VERSION}
COMPATIBILITY AnyNewerVersion
)
configure_package_config_file(
"support/cmake/cppformatConfig.cmake.in"
"${project_config}"
INSTALL_DESTINATION "${config_install_dir}"
)
export(TARGETS cppformat FILE "${targets_export_name}.cmake")
# install version, config and target files
install(
FILES "${project_config}" "${version_config}"
DESTINATION "${config_install_dir}"
)
install(EXPORT "${targets_export_name}" DESTINATION "${config_install_dir}")
# install the library and the include file
install(TARGETS cppformat EXPORT "${targets_export_name}" DESTINATION "${FMT_LIB_DIR}")
install(FILES format.h DESTINATION "include/cppformat")
endif () endif ()

4
support/cmake/cppformatConfig.cmake.in Normal file
View File

@ -0,0 +1,4 @@
@PACKAGE_INIT@
include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")
check_required_components("cppformat")