[Bug fortran/52846] [F2008] Support submodules

[sfilippone at uniroma2 dot it]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52846

--- Comment #13 from Salvatore Filippone <sfilippone at uniroma2 dot it> ---
Created attachment 35996
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35996&action=edit
test case

Cleaned up a bit of noise due to the process of reducing the test case: it was
spitting out a legitimate but pointless liker error about erractionrestore.

[sfilippo@jacobi tlink]$ gfortran -o testlk testlk.f90 
/tmp/ccbhv5VA.o: In function `__error_impl_mod_MOD_ser_error_print_stack':
testlk.f90:(.text+0x1b): undefined reference to `__error_mod_MOD_serror'
/tmp/ccbhv5VA.o: In function `__error_impl_mod_MOD_par_error_print_stack':
testlk.f90:(.text+0x3b): undefined reference to `__error_mod_MOD_perror'
/tmp/ccbhv5VA.o: In function `__error_mod_MOD_par_error_handler':
testlk.f90:(.text+0x6a): undefined reference to `__error_mod_MOD_perror'
testlk.f90:(.text+0x86): undefined reference to `__error_mod_MOD_perror'
/tmp/ccbhv5VA.o: In function `__error_mod_MOD_ser_error_handler':
testlk.f90:(.text+0xa5): undefined reference to `__error_mod_MOD_serror'
/tmp/ccbhv5VA.o: In function `MAIN__':
testlk.f90:(.text+0xda): undefined reference to `__error_mod_MOD_serror'
collect2: error: ld returned 1 exit status