Addidtion of Findneural-fortran.cmake (#178)

* Addition of Findneural-fortran.cmake

* Rename libneural to libneural-fortran

* Adapt test/CmakeLists.txt

* adapt example/CMakeLists.txt

CMakeLists.txt

@@ -21,8 +21,8 @@ include(cmake/functional.cmake)
 include(cmake/h5fortran.cmake)
 include(cmake/json.cmake)
 
-# library to archive (libneural.a)
-add_library(neural
+# library to archive (libneural-fortran.a)
+add_library(neural-fortran
   src/nf.f90
   src/nf/nf_activation.f90
   src/nf/nf_base_layer.f90
@@ -64,14 +64,14 @@ add_library(neural
   src/nf/io/nf_io_hdf5_submodule.f90
 )
 
-target_link_libraries(neural PRIVATE
+target_link_libraries(neural-fortran PRIVATE
   functional::functional
   h5fortran::h5fortran
   HDF5::HDF5
   jsonfortran::jsonfortran
 )
 
-install(TARGETS neural)
+install(TARGETS neural-fortran)
 
 # Remove leading or trailing whitespace
 string(REGEX REPLACE "^ | $" "" LIBS "${LIBS}")

README.md

@@ -203,6 +203,23 @@ ctest
 
 to run the tests.
 
+## Using neural-fortran in your project
+
+You can use the CMake module available [here](cmake/Findneural-fortran.cmake) to
+find or fetch an installation of this project while configuring your project. This
+module makes sure that the `neural-fortran::neural-fortran` target is always generated regardless
+of how the neural-fortran is included in the project.
+
+You can configure neural-fortran by setting the appropriate options before
+including the subproject.
+
+The following should be added in the CMake file of your directory:
+```cmake
+if(NOT TARGET "neural-fortran::neural-fortran")
+  find_package("neural-fortran" REQUIRED)
+endif()
+```
+
 ## Examples
 
 The easiest way to get a sense of how to use neural-fortran is to look at

cmake/Findneural-fortran.cmake

@@ -0,0 +1,179 @@
+# SPDX-Identifier: MIT
+# Based on https://github.com/fortran-lang/stdlib-cmake-example
+
+#[[.rst:
+Find neural-fortran
+-------------------
+
+Makes the neural-fortran library project available.
+
+Imported Targets
+^^^^^^^^^^^^^^^^
+
+This module provides the following imported target, if found:
+
+``neural-fortran::neural-fortran``
+  The neural-fortran library
+
+
+Result Variables
+^^^^^^^^^^^^^^^^
+
+This module will define the following variables:
+
+``NEURAL-FORTRAN_FOUND``
+  True if the neural-fortran library is available
+
+``NEURAL-FORTRAN_SOURCE_DIR``
+  Path to the source directory of the neural-fortran library project,
+  only set if the project is included as source.
+
+``NEURAL-FORTRAN_BINARY_DIR``
+  Path to the binary directory of the neural-fortran library project,
+  only set if the project is included as source.
+
+Cache variables
+^^^^^^^^^^^^^^^
+
+The following cache variables may be set to influence the library detection:
+
+``NEURAL-FORTRAN_FIND_METHOD``
+  Methods to find or make the project available. Available methods are
+  - ``cmake``: Try to find via CMake config file
+  - ``pkgconf``: Try to find via pkg-config file
+  - ``subproject``: Use source in subprojects directory
+  - ``fetch``: Fetch the source from upstream
+
+``NEURAL-FORTRAN_DIR``
+  Used for searching the CMake config file
+
+``NEURAL-FORTRAN_SUBPROJECT``
+Directory to find the neural-fortran library subproject, relative to the project root
+
+#]]
+
+set(_lib "neural-fortran")
+set(_pkg "NEURAL-FORTRAN")
+set(_url "https://github.com/modern-fortran/neural-fortran.git")
+
+if(NOT DEFINED "${_pkg}_FIND_METHOD")
+  if(DEFINED "${PROJECT_NAME}-dependency-method")
+    set("${_pkg}_FIND_METHOD" "${${PROJECT_NAME}-dependency-method}")
+  else()
+    set("${_pkg}_FIND_METHOD" "cmake" "pkgconf" "subproject" "fetch")
+  endif()
+  set("_${_pkg}_FIND_METHOD")
+endif()
+
+foreach(method ${${_pkg}_FIND_METHOD})
+  if(TARGET "${_lib}::${_lib}")
+    break()
+  endif()
+
+  if("${method}" STREQUAL "cmake")
+    message(STATUS "${_lib}: Find installed package")
+    if(DEFINED "${_pkg}_DIR")
+      set("_${_pkg}_DIR")
+      set("${_lib}_DIR" "${_pkg}_DIR")
+    endif()
+    find_package("${_lib}" CONFIG)
+    if("${_lib}_FOUND")
+      message(STATUS "${_lib}: Found installed package")
+      break()
+    endif()
+  endif()
+
+  if("${method}" STREQUAL "pkgconf")
+    find_package(PkgConfig QUIET)
+    pkg_check_modules("${_pkg}" QUIET "${_lib}")
+    if("${_pkg}_FOUND")
+      message(STATUS "Found ${_lib} via pkg-config")
+
+      add_library("${_lib}::${_lib}" INTERFACE IMPORTED)
+      target_link_libraries(
+        "${_lib}::${_lib}"
+        INTERFACE
+        "${${_pkg}_LINK_LIBRARIES}"
+        )
+      target_include_directories(
+        "${_lib}::${_lib}"
+        INTERFACE
+        "${${_pkg}_INCLUDE_DIRS}"
+        )
+
+      break()
+    endif()
+  endif()
+
+  if("${method}" STREQUAL "subproject")
+    if(NOT DEFINED "${_pkg}_SUBPROJECT")
+      set("_${_pkg}_SUBPROJECT")
+      set("${_pkg}_SUBPROJECT" "subprojects/${_lib}")
+    endif()
+    set("${_pkg}_SOURCE_DIR" "${PROJECT_SOURCE_DIR}/${${_pkg}_SUBPROJECT}")
+    set("${_pkg}_BINARY_DIR" "${PROJECT_BINARY_DIR}/${${_pkg}_SUBPROJECT}")
+    if(EXISTS "${${_pkg}_SOURCE_DIR}/CMakeLists.txt")
+      message(STATUS "Include ${_lib} from ${${_pkg}_SUBPROJECT}")
+      add_subdirectory(
+        "${${_pkg}_SOURCE_DIR}"
+        "${${_pkg}_BINARY_DIR}"
+      )
+
+      add_library("${_lib}::${_lib}" INTERFACE IMPORTED)
+      target_link_libraries("${_lib}::${_lib}" INTERFACE "${_lib}")
+
+      # We need the module directory in the subproject before we finish the configure stage
+      if(NOT EXISTS "${${_pkg}_BINARY_DIR}/mod_files")
+        make_directory("${${_pkg}_BINARY_DIR}/mod_files")
+      endif()
+
+      break()
+    endif()
+  endif()
+
+  if("${method}" STREQUAL "fetch")
+    message(STATUS "Retrieving ${_lib} from ${_url}")
+    include(FetchContent)
+    FetchContent_Declare(
+      "${_lib}"
+      GIT_REPOSITORY "${_url}"
+      GIT_TAG "HEAD"
+      )
+    FetchContent_MakeAvailable("${_lib}")
+
+    add_library("${_lib}::${_lib}" INTERFACE IMPORTED)
+    target_link_libraries("${_lib}::${_lib}" INTERFACE "${_lib}")
+
+    # We need the module directory in the subproject before we finish the configure stage
+    FetchContent_GetProperties("${_lib}" SOURCE_DIR "${_pkg}_SOURCE_DIR")
+    FetchContent_GetProperties("${_lib}" BINARY_DIR "${_pkg}_BINARY_DIR")
+    if(NOT EXISTS "${${_pkg}_BINARY_DIR}/mod_files")
+      make_directory("${${_pkg}_BINARY_DIR}/mod_files")
+    endif()
+
+    break()
+  endif()
+
+endforeach()
+
+if(TARGET "${_lib}::${_lib}")
+  set("${_pkg}_FOUND" TRUE)
+else()
+  set("${_pkg}_FOUND" FALSE)
+endif()
+
+if(DEFINED "_${_pkg}_SUBPROJECT")
+  unset("${_pkg}_SUBPROJECT")
+  unset("_${_pkg}_SUBPROJECT")
+endif()
+if(DEFINED "_${_pkg}_DIR")
+  unset("${_lib}_DIR")
+  unset("_${_pkg}_DIR")
+endif()
+if(DEFINED "_${_pkg}_FIND_METHOD")
+  unset("${_pkg}_FIND_METHOD")
+  unset("_${_pkg}_FIND_METHOD")
+endif()
+unset(_lib)
+unset(_pkg)
+unset(_url)

example/CMakeLists.txt

@@ -11,7 +11,7 @@ foreach(execid
 )
   add_executable(${execid} ${execid}.f90)
   target_link_libraries(${execid} PRIVATE
-    neural
+    neural-fortran
     h5fortran::h5fortran
     jsonfortran::jsonfortran
     ${LIBS}

test/CMakeLists.txt

@@ -19,7 +19,7 @@ foreach(execid
   loss
   )
   add_executable(test_${execid} test_${execid}.f90)
-  target_link_libraries(test_${execid} PRIVATE neural h5fortran::h5fortran jsonfortran::jsonfortran ${LIBS})
+  target_link_libraries(test_${execid} PRIVATE neural-fortran h5fortran::h5fortran jsonfortran::jsonfortran ${LIBS})
 
   add_test(NAME test_${execid} COMMAND test_${execid})
 endforeach()