[cmake] General improvements to CMake config.

  - Allow calling omc_add_to_report with a variable that is not set. Some
    variables can be set or not depending on configuration. This used to
    cause errors when the variable was unset and also added to report.

  - Explicitly tell cmake our project needs C CXX and Fortran.
        Just to get the initial reports of compiler info at the beginning
        of configuration.

  - Add CXX and Fortran compiler IDs to the printed report.

  - Install `libomcmemory`. It was overlooked before.

OMCompiler/.cmake/omc_utils.cmake

@@ -3,7 +3,10 @@ include(CMakePrintHelpers)
 
 macro(omc_add_to_report var)
   cmake_print_variables(${var})
-  add_feature_info(${var} ${var} ${${var}})
+  # quote to change variables with empty values to "" (empty string).
+  # Otherwise they will valuate to nothing and that will cause a
+  # syntax error since add_feature_info expects 3 arguments.
+  add_feature_info(${var} ${var} "${${var}}")
 endmacro(omc_add_to_report)
 
 set(CMAKE_MESSAGE_CONTEXT_SHOW ON)

OMCompiler/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
-project(OMCompiler)
+project(OMCompiler C CXX Fortran)
 
 # Variable for signifying that we are using the new CMake configuration.
 # We use this to selectively include some cmake source files
@@ -25,8 +25,9 @@ include(.cmake/omc_target_info.cmake)
 include(.cmake/omc_check_exists.cmake)
 
 # Add the compiler ids to the report for convenience.
-omc_add_to_report(CMAKE_CXX_COMPILER_ID)
 omc_add_to_report(CMAKE_C_COMPILER_ID)
+omc_add_to_report(CMAKE_CXX_COMPILER_ID)
+omc_add_to_report(CMAKE_Fortran_COMPILER_ID)
 omc_add_to_report(CMAKE_LIBRARY_ARCHITECTURE)
 
 #########################################################################################################

OMCompiler/SimulationRuntime/c/cmake_3.14.cmake

@@ -44,6 +44,7 @@ target_sources(omcmemory PRIVATE ${OMC_SIMRT_GC_SOURCES})
 target_link_libraries(omcmemory PUBLIC omc::3rd::omcgc)
 target_include_directories(omcmemory PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
+install(TARGETS omcmemory)
 
 # ######################################################################################################################
 # Library: OpenModelicaRuntimeC