https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60357
--- Comment #10 from janus at gcc dot gnu.org --- (In reply to Andre Vehreschild from comment #9) > I just need to > figure, if allocating the component explicitly is valid in Fortran. For sure. I think both the examples in comment 4 and 5 are actually valid Fortran code. In order to make sure we're talking about the same thing, let's have a look at the following code: Type A integer :: X = 1 integer, allocatable :: y end type Type(A) :: Me allocate(Me%y) print *,"A" Me = A(X=1, y=2) print *,"B" print *, Me%y end This is a variant of the example above that produced the segfault. I inserted some print statements in order to debug it. It prints at runtime: A B Program received signal SIGSEGV: Segmentation fault - invalid memory reference. This shows clearly that the segfault occurs when we try to access Me%y in the last print statement, meaning that it is probably unallocated although it clearly should be. -fdump-tree-original shows that the problem is in the translation of the structure constructor assignment, which apparently leaves the y-component unallocated.