From 54c5dc6f0eba31123f5f3b3db4b969bcc56dc66b Mon Sep 17 00:00:00 2001
From: mmichaux <michael.michaux@oca.eu>
Date: Wed, 15 May 2019 15:17:27 +0200
Subject: [PATCH] Added CLASS as a submodule.

---
 .gitignore           |  2 ++
 .gitmodules          |  3 +++
 CMakeLists.txt       |  2 ++
 external/class       |  1 +
 external/class.cmake | 64 ++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 72 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .gitmodules
 create mode 160000 external/class
 create mode 100644 external/class.cmake

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1899660
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build
+.vscode
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4b06ca9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/class"]
+	path = external/class
+	url = https://github.com/lesgourg/class_public.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e2dc4f..544336c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.9)
 set(PRGNAME fastLPT)
 project(fastLPT)
 
+# include class submodule
+include(${CMAKE_CURRENT_SOURCE_DIR}/external/class.cmake)
 
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -march=native -Wall -fno-omit-frame-pointer -g  -fsanitize=address")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -march=native -Wall")
diff --git a/external/class b/external/class
new file mode 160000
index 0000000..63f3cf1
--- /dev/null
+++ b/external/class
@@ -0,0 +1 @@
+Subproject commit 63f3cf18fad0061688b8bf95055765b4793f25c7
diff --git a/external/class.cmake b/external/class.cmake
new file mode 100644
index 0000000..7cd6360
--- /dev/null
+++ b/external/class.cmake
@@ -0,0 +1,64 @@
+# initialize the class submodule if necessary
+if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/class/Makefile")
+  message(STATUS "class submodule is initialized.")
+else()
+  message(STATUS "class submodule is NOT initialized: executing git command")
+  execute_process(COMMAND git submodule update --init -- external/class
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
+# list of object files generated by class
+set(CLASS_OBJECT_FILES
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/arrays.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/background.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/common.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/dei_rkck.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/evolver_ndf15.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/evolver_rkck.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/growTable.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/helium.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/history.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/hydrogen.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/hyperspherical.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/hyrectools.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/input.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/lensing.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/nonlinear.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/output.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/parser.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/perturbations.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/primordial.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/quadrature.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/sparse.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/spectra.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/thermodynamics.o
+  ${CMAKE_CURRENT_LIST_DIR}/class/build/transfer.o
+)
+
+# python3
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+
+# command to build class using its own makefile
+add_custom_command(OUTPUT ${CLASS_OBJECT_FILES}
+  COMMAND PYTHON=${Python3_EXECUTABLE} CC=${CMAKE_C_COMPILER} make
+  WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/class
+)
+
+# target for class objects
+add_custom_target(class_objects DEPENDS ${CLASS_OBJECT_FILES})
+
+# library for class cpp wrappers
+add_library(class_cpp 
+  ${CMAKE_CURRENT_LIST_DIR}/class/cpp/Engine.cc
+  ${CMAKE_CURRENT_LIST_DIR}/class/cpp/ClassEngine.cc)
+target_include_directories(class_cpp
+  PRIVATE ${CMAKE_CURRENT_LIST_DIR}/class/include)
+
+# test executable
+add_executable(testKlass
+  ${CMAKE_CURRENT_LIST_DIR}/class/cpp/testKlass.cc)
+target_include_directories(testKlass
+  PRIVATE ${CMAKE_CURRENT_LIST_DIR}/class/include)
+target_link_libraries(testKlass ${CLASS_OBJECT_FILES})
+target_link_libraries(testKlass class_cpp)
+add_dependencies(testKlass class_objects)