https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70260
--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fort...@t-online.de> --- Another situation : $ cat z3.f90 subroutine s (f) integer, external :: f, g integer :: h g = f(2) h = g(2) end $ gfortran-6 -c z3.f90 gimplification failed: g <addr_expr 0x2abc6cdf6d20 type <pointer_type 0x2abc6ce1d150 type <function_type 0x2abc6ce1d0a8 type <integer_type 0x2abc6cc617e0 integer(kind=4)> QI size <integer_cst 0x2abc6cc5dcc0 constant 8> unit size <integer_cst 0x2abc6cc5dcd8 constant 1> align 8 symtab 0 alias set -1 canonical type 0x2abc6cc7e738 attributes <tree_list 0x2abc6ce1bbb8 purpose <identifier_node 0x2abc6cdf9f50 fn spec> value <tree_list 0x2abc6ce1bb90 value <string_cst 0x2abc6ce166d8 constant ".">>> pointer_to_this <pointer_type 0x2abc6ce1d150>> unsigned DI size <integer_cst 0x2abc6cc5dbd0 constant 64> unit size <integer_cst 0x2abc6cc5dbe8 constant 8> align 64 symtab 0 alias set -1 canonical type 0x2abc6ce1d1f8> constant arg 0 <function_decl 0x2abc6ce1c540 g type <function_type 0x2abc6ce1d0a8> addressable used public external QI file z3.f90 line 2 col 0 align 8 context <translation_unit_decl 0x2abc6cc67168 D.3415> chain <function_decl 0x2abc6ce1c460 s type <function_type 0x2abc6ce1d3f0> public static QI file z3.f90 line 1 col 0 align 8 context <translation_unit_decl 0x2abc6cc67168 D.3415> initial <block 0x2abc6ce1f0c0> result <result_decl 0x2abc6cc671e0 D.3417> (mem:QI (symbol_ref:DI ("s_") [flags 0x3] <function_decl 0x2abc6ce1c460 s>) [0 S1 A8]) arguments <parm_decl 0x2abc6ce0b200 f> struct-function 0x2abc6ce1d498 chain <function_decl 0x2abc6ce1c380 _gfortran_st_set_nml_var_dim>>> z3.f90:4:0 start: z3.f90:4:0 finish: z3.f90:4:0> z3.f90:4:0: g = f(2) internal compiler error: gimplification failed Before : $ gfortran-5 -c z3.f90 z3.f90:4:0: g = f(2) ^ internal compiler error: in gimplify_expr, at gimplify.c:9063 Working variant : $ cat z4.f90 subroutine s (f) integer, external :: f, g integer :: h h = f(2) h = g(2) end