ortools-clone/cmake/FindClp.cmake

#[=======================================================================[.rst:
FindClp
--------

This module determines the Clp library of the system.

IMPORTED Targets
^^^^^^^^^^^^^^^^

This module defines :prop_tgt:`IMPORTED` target ``Coin::Clp`` and ``Coin::OsiClp``, if
Clp has been found.

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

::

Clp_FOUND          - True if Clp found.

#]=======================================================================]
find_package(PkgConfig REQUIRED)

pkg_check_modules(Clp REQUIRED clp IMPORTED_TARGET GLOBAL)
add_library(Coin::Clp ALIAS PkgConfig::Clp)
add_library(Coin::ClpSolver ALIAS PkgConfig::Clp)

pkg_check_modules(OSI_CLP REQUIRED osi-clp IMPORTED_TARGET GLOBAL)
add_library(Coin::OsiClp ALIAS PkgConfig::OSI_CLP)
cmake: Add dummy find module (Fix #1412) 2020-01-31 18:51:50 +01:00			`#[=======================================================================[.rst:`
			`FindClp`
			`--------`

			`This module determines the Clp library of the system.`

			`IMPORTED Targets`
			`^^^^^^^^^^^^^^^^`

			This module defines :prop_tgt:`IMPORTED` target ``Coin::Clp`` and ``Coin::OsiClp``, if
			`Clp has been found.`

			`Result Variables`
			`^^^^^^^^^^^^^^^^`

			`This module defines the following variables:`

			`::`

			`Clp_FOUND - True if Clp found.`

			`#]=======================================================================]`
			`find_package(PkgConfig REQUIRED)`

Fix CMake package config file (#3068) * Fix CMake package config file There are currently a few issues with how the COIN-OR dependencies are resolved when using `find_package(ortools CONFIG)` to add or-tools to an external CMake project. * With CMake >=3.9.6, we try to find the Clp and Cbc packages using the CONFIG mode of `find_package`. This always fails since neither library provides a CMake config file. * If we address the above issue by instead using the MODULE mode of `find_package`, then we need to add `FindCbc.cmake` and `FindCpl.cmake` scripts to the CMAKE_MODULE_PATH in order to teach CMake how to find these dependencies. I propose that or-tools should install these scripts alongside its config file so that they're available to external CMake projects. * Finally, the `FindCbc.cmake` script included with or-tools defines the variable `CBC_FOUND` when it's successful, rather than `Cbc_FOUND` as expected (CMake variables are case-sensitive). The `FindCpl.cmake` script has a similar issue. As a result, even when the above two points are addressed, `find_package(ortools CONFIG)` will still fail because CMake erroneously thinks that these two dependencies weren't succesfully found. This commit attempts to address the above issues with the following changes: * The or-tools CMake config file is modified to allow searching for Cbc and Cpl using the MODULE mode of `find_package`. * `FindCbc.cmake` and `FindCpl.cmake` are installed with the CMake package config files and are added to the CMAKE_MODULE_PATH if `USE_COINOR` was truthy. * The `FindCbc.cmake` and `FindCpl.cmake` files are modified to change the case of variables they export. * Only install FindXXX.cmake modules if COIN-OR support was enabled 2022-01-13 23:38:37 -08:00			`pkg_check_modules(Clp REQUIRED clp IMPORTED_TARGET GLOBAL)`
			`add_library(Coin::Clp ALIAS PkgConfig::Clp)`
			`add_library(Coin::ClpSolver ALIAS PkgConfig::Clp)`
cmake: Add dummy find module (Fix #1412) 2020-01-31 18:51:50 +01:00
			`pkg_check_modules(OSI_CLP REQUIRED osi-clp IMPORTED_TARGET GLOBAL)`
			`add_library(Coin::OsiClp ALIAS PkgConfig::OSI_CLP)`