did not compile, adjusted dummy compilation routine to detect such errors

src/CMakeLists.txt

@@ -174,8 +174,10 @@ if ("${PROJECT_NAME}" STREQUAL "DAMASK_spectral")
       list(APPEND OBJECTFILES $<TARGET_OBJECTS:SPECTRAL_SOLVER>)
       if(NOT "${CMAKE_BUILD_TYPE}" STREQUAL "SYNTAXONLY")
         add_executable(DAMASK_spectral "DAMASK_spectral.f90" ${OBJECTFILES})
-        add_dependencies(DAMASK_spectral SPECTRAL_SOLVER)
+      else()
+        add_library(DAMASK_spectral OBJECT "DAMASK_spectral.f90")
       endif()
+      add_dependencies(DAMASK_spectral SPECTRAL_SOLVER)
 elseif ("${PROJECT_NAME}" STREQUAL "DAMASK_FEM")
       add_library(FEM_UTILITIES OBJECT "FEM_utilities.f90")
       add_dependencies(FEM_UTILITIES DAMASK_CPFE)

src/DAMASK_spectral.f90

@@ -511,7 +511,6 @@ program DAMASK_spectral
                ',a,'//IO_intOut(stepFraction)//',a,'//IO_intOut(subStepFactor**cutBackLevel)//')') &
                'Increment ',totalIncsCounter,'/',sum(loadCases%incs),&
                '-',stepFraction, '/', subStepFactor**cutBackLevel
-         endif
 
 !--------------------------------------------------------------------------------------------------
 ! forward fields
@@ -713,6 +712,10 @@ subroutine quit(stop_id)
  PetscErrorCode :: ierr = 0
  logical :: ErrorInQuit
  
+ external :: &
+   PETScFinalize, &
+   MPI_finalize
+
  call BasicPETSC_destroy()
  call AL_destroy()
  call Polarisation_destroy()