Create method check_modules to check for duplicate modules

Author: kubajj

fpm/src/fpm.f90

@@ -154,8 +154,45 @@ subroutine build_model(model, settings, package, error)
     end do
     if (allocated(error)) return
 
+    ! Check for duplicate modules
+    call check_modules(model)
 end subroutine build_model
 
+! Check for duplicate modules
+subroutine check_modules(model) 
+    type(fpm_model_t), intent(in) :: model
+    integer :: maxsize
+    integer :: i,j,k,modi
+    type(string_t), allocatable :: modules(:)
+    ! Initialise the size of array
+    maxsize = 0
+    ! Get number of modules provided by each source file
+    do i=1,size(model%packages(1)%sources)
+      if (allocated(model%packages(1)%sources(j)%modules_provided)) then
+        maxsize = maxsize + size(model%packages(1)%sources(i)%modules_provided)
+      end if
+    end do
+    ! Allocate array to contain distinct names of modules
+    allocate(modules(1:maxsize))
+
+    ! Initialise index to point at start of the newly allocated array
+    modi = 1
+
+    ! Loop through modules provided by each source file
+    ! Add it to the array if it is not already there
+    ! Otherwise print out warning about duplicates
+    do j=1,size(model%packages(1)%sources)
+      if (allocated(model%packages(1)%sources(j)%modules_provided)) then
+        do k=1,size(model%packages(1)%sources(j)%modules_provided)
+          if (model%packages(1)%sources(j)%modules_provided(k)%s.in.modules) then
+            print *,"Warning: Module ",model%packages(1)%sources(j)%modules_provided(k)%s," is duplicate"
+          else
+            modules(modi) = model%packages(1)%sources(j)%modules_provided(k)
+          end if
+        end do
+      end if
+    end do
+end subroutine check_modules
 
 subroutine cmd_build(settings)
 type(fpm_build_settings), intent(in) :: settings