update travis (#8)

* update travis

* use CPM

.travis.yml

@@ -17,7 +17,7 @@ matrix:
           packages: 
             - g++-8
       env:
-        - MATRIX_EVAL="export CC=g++-8; export CXX=g++-8;"
+        - MATRIX_EVAL="export CC=gcc-8; export CXX=g++-8;"
 
     - os: linux
       compiler: clang

CMakeLists.txt

@@ -1,5 +1,5 @@
 
-cmake_minimum_required (VERSION 3.0)
+cmake_minimum_required (VERSION 3.5)
 
 # ---- create project ----
 
@@ -24,8 +24,15 @@ endif()
 
 # ---- dependencies ----
 
+include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME LHC
+  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
+  VERSION 0.3
+)
+
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/dependencies/ctti)
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/dependencies/LHC)
 
 # ---- Header target ----
 

cmake/CPM.cmake

@@ -0,0 +1,63 @@
+set(_CPM_Dir "${CMAKE_CURRENT_LIST_DIR}")
+
+include(CMakeParseArguments)
+include(${_CPM_Dir}/DownloadProject.cmake)
+
+function(CPMHasPackage) 
+
+endfunction()
+
+function(CPMAddPackage)
+  set(options QUIET)
+
+  set(oneValueArgs
+    NAME
+    GIT_REPOSITORY
+    VERSION
+    GIT_TAG
+    BINARY_DIR
+  )
+
+  set(multiValueArgs "")
+
+  cmake_parse_arguments(CPM_ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  if (NOT CPM_PACKAGES)
+    set(CPM_PACKAGES "")
+  endif()
+
+  if (NOT CPM_ARGS_BINARY_DIR)
+    set(CPM_ARGS_BINARY_DIR ${CMAKE_BINARY_DIR}/CPM-projects/${CPM_ARGS_NAME})
+  endif()
+
+  if (NOT CPM_PROJECT_DIR)
+    set(CPM_PROJECT_DIR "${CPM_ARGS_BINARY_DIR}")
+  endif()
+
+  if (NOT CPM_ARGS_GIT_TAG)
+    set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
+  endif()
+
+  SET(CPM_TARGET_CMAKE_FILE "${CPM_PROJECT_DIR}")
+
+  if (${CPM_ARGS_NAME} IN_LIST CPM_PACKAGES)
+    message(STATUS "CPM: package ${CPM_ARGS_NAME} already added")
+  else()
+    message(STATUS "CPM: adding package ${CPM_ARGS_NAME}@${CPM_ARGS_VERSION}")
+    # update package data
+    LIST(APPEND CPM_PACKAGES ${CPM_ARGS_NAME})
+    # save package data
+    set(CPM_PACKAGES "${CPM_PACKAGES}" CACHE INTERNAL "CPM Packages")
+
+    configure_file(
+      "${_CPM_Dir}/CPMProject.CMakeLists.cmake.in"
+      "${CPM_TARGET_CMAKE_FILE}/CMakeLists.txt"
+      @ONLY
+    )
+  endif()
+
+  if (NOT TARGET ${CPM_ARGS_NAME})
+    add_subdirectory(${CPM_TARGET_CMAKE_FILE} ${CPM_ARGS_BINARY_DIR})
+  endif()
+
+endfunction()

cmake/CPMProject.CMakeLists.cmake.in

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+if(TARGET @CPM_ARGS_NAME@)
+  return()
+endif()
+
+find_package(@CPM_ARGS_NAME@ @CPM_ARGS_VERSION@ QUIET)
+
+if(${PACKAGE_FOUND})
+  set_target_properties(@CPM_ARGS_NAME@ 
+    PROPERTIES
+      IMPORTED_GLOBAL True
+  )
+else()
+
+  download_project(
+    PROJ @CPM_ARGS_NAME@
+    GIT_REPOSITORY @CPM_ARGS_GIT_REPOSITORY@
+    GIT_TAG @CPM_ARGS_GIT_TAG@
+    UPDATE_DISCONNECTED 1
+    GIT_SHALLOW 1
+    PREFIX @CPM_ARGS_BINARY_DIR@/dl
+    QUIET
+  )
+
+  add_subdirectory(${@CPM_ARGS_NAME@_SOURCE_DIR} ${@CPM_ARGS_NAME@_BINARY_DIR})
+endif()

tests/CMakeLists.txt

@@ -18,7 +18,7 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   find_package(LarsVisitor REQUIRED)
 endif()
 
-add_subdirectory(../dependencies/catch2 ${PROJECT_BINARY_DIR}/catch2)
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/catch2 ${PROJECT_BINARY_DIR}/catch2)
 
 # ---- Create binary ----