WIP: Feature/#425 open vr optional

cmake/ConanHelpers.cmake

@@ -21,63 +21,64 @@
 #------------------------------------------------------------------------------
 
 #download/build the missing dependencies
-include(conan)
-execute_process(COMMAND conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan False OUTPUT_QUIET)
-execute_process(COMMAND conan remote add rwth-vr https://api.bintray.com/conan/rwth-vr/conan False OUTPUT_QUIET)
-conan_cmake_run(CONANFILE conanfile.py
-                BUILD missing)
-
-find_file(CONAN_COMMAND
-  NAMES conan conan.exe
-  PATHS $ENV{PATH} $ENV{CONAN_DIR}
-)
-if(CONAN_COMMAND)
-  option(USE_CONAN "Use conan for dependency managment." ON)
-else()
-  message(STATUS
-    " NOTICE:\n"
-    "      This project can use conan for dependency management.\n"
-    "      Apparently, you do not have conan installed on your machine.\n"
-    "      So you need to keep track of all dependencies.\n"
-    "      In order to use conan, please install it:\n"
-    "          pip install conan\n"
-    "      More info: https://conan.io"
+macro(conan_install)
+  include(conan)
+  execute_process(COMMAND conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan False OUTPUT_QUIET)
+  execute_process(COMMAND conan remote add rwth-vr https://api.bintray.com/conan/rwth-vr/conan False OUTPUT_QUIET)
+  conan_cmake_run(CONANFILE conanfile.py ${ARGV})
+  
+  find_file(CONAN_COMMAND
+    NAMES conan conan.exe
+    PATHS $ENV{PATH} $ENV{CONAN_DIR}
   )
-endif()
-
-#we reset CONAN_BUILD_INFO, so it is searched everytime, e.g. if we want to change from multi to a specific config
-set (CONAN_BUILD_INFO "CONAN_BUILD_INFO-NOTFOUND")
-find_file(CONAN_BUILD_INFO conanbuildinfo_multi.cmake
-  NO_DEFAULT_PATH
-  PATHS ${CMAKE_BINARY_DIR}
-)
-if(${CONAN_BUILD_INFO} STREQUAL  "CONAN_BUILD_INFO-NOTFOUND")
-	find_file(CONAN_BUILD_INFO conanbuildinfo.cmake
-	  NO_DEFAULT_PATH
-	  PATHS ${CMAKE_BINARY_DIR}
-	)
-	if(NOT ${CONAN_BUILD_INFO} STREQUAL  "CONAN_BUILD_INFO-NOTFOUND")
-		set( USE_NOT_MULTI_CONAN_BUILD_INFO TRUE)
-	endif()
-endif()
-
-
-if(USE_CONAN AND NOT CONAN_BUILD_INFO)
-  message(FATAL_ERROR
-    " Error using conan:\n"
-    "   You need to execute 'conan install' before running cmake!\n"
-    "   Aborting.")
-endif()
-
-
-if(USE_CONAN AND CONAN_BUILD_INFO)
-  include(${CONAN_BUILD_INFO})
-  if(USE_NOT_MULTI_CONAN_BUILD_INFO)
-	conan_basic_setup(TARGETS NO_OUTPUT_DIRS)
+  if(CONAN_COMMAND)
+    option(USE_CONAN "Use conan for dependency managment." ON)
   else()
-    conan_basic_setup(TARGETS)
+    message(STATUS
+      " NOTICE:\n"
+      "      This project can use conan for dependency management.\n"
+      "      Apparently, you do not have conan installed on your machine.\n"
+      "      So you need to keep track of all dependencies.\n"
+      "      In order to use conan, please install it:\n"
+      "          pip install conan\n"
+      "      More info: https://conan.io"
+    )
+  endif()
+  
+  #we reset CONAN_BUILD_INFO, so it is searched everytime, e.g. if we want to change from multi to a specific config
+  set (CONAN_BUILD_INFO "CONAN_BUILD_INFO-NOTFOUND")
+  find_file(CONAN_BUILD_INFO conanbuildinfo_multi.cmake
+    NO_DEFAULT_PATH
+    PATHS ${CMAKE_BINARY_DIR}
+  )
+  if(${CONAN_BUILD_INFO} STREQUAL  "CONAN_BUILD_INFO-NOTFOUND")
+  	find_file(CONAN_BUILD_INFO conanbuildinfo.cmake
+  	  NO_DEFAULT_PATH
+  	  PATHS ${CMAKE_BINARY_DIR}
+  	)
+  	if(NOT ${CONAN_BUILD_INFO} STREQUAL  "CONAN_BUILD_INFO-NOTFOUND")
+  		set( USE_NOT_MULTI_CONAN_BUILD_INFO TRUE)
+  	endif()
   endif()
-endif()
+  
+  
+  if(USE_CONAN AND NOT CONAN_BUILD_INFO)
+    message(FATAL_ERROR
+      " Error using conan:\n"
+      "   You need to execute 'conan install' before running cmake!\n"
+      "   Aborting.")
+  endif()
+  
+  
+  if(USE_CONAN AND CONAN_BUILD_INFO)
+    include(${CONAN_BUILD_INFO})
+    if(USE_NOT_MULTI_CONAN_BUILD_INFO)
+  	conan_basic_setup(TARGETS NO_OUTPUT_DIRS)
+    else()
+      conan_basic_setup(TARGETS)
+    endif()
+  endif()
+endmacro()
 
 macro(CONAN_OR_FIND_PACKAGE package)
   # parse arguments