https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105310
Bug ID: 105310
Summary: ICE when UNION is after the 8th field in a DEC
STRUCTURE with -finit-derived -finit-local-zero
Product: gcc
Version: 7.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: foreese at gcc dot gnu.org
Target Milestone: ---
Created attachment 52833
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52833&action=edit
Test case exhibiting the ICE
Consider:
$ cat testunion.for
PROGRAM TESTU
IMPLICIT NONE
STRUCTURE /FOO/
INTEGER(4) :: a,b,c,d,e,f,g,h
UNION
MAP
ENDMAP
ENDUNION
ENDSTRUCTURE
RECORD /FOO/ bar
bar.a = 1
END
$ gfortran -O0 -c -ffixed-form -finit-local-zero -finit-derived -fdec-structure
testunion.for
testunion.for:15:0:
end
internal compiler error: Segmentation fault
0xa72a2f crash_signal
/data/gcc-7.4.0/gcc/toplev.c:337
0xcb6a54 compute_reloc_for_constant(tree_node*)
/data/gcc-7.4.0/gcc/varasm.c:4120
0xcb6b5c compute_reloc_for_constant(tree_node*)
/data/gcc-7.4.0/gcc/varasm.c:4174
0xcbc802 get_variable_section(tree_node*, bool)
/data/gcc-7.4.0/gcc/varasm.c:1148
0xcc0cb7 assemble_variable(tree_node*, int, int, int)
/data/gcc-7.4.0/gcc/varasm.c:2225
0xcc4ce2 varpool_node::assemble_decl()
/data/gcc-7.4.0/gcc/varpool.c:588
0x7426fc output_in_order
/data/gcc-7.4.0/gcc/cgraphunit.c:2289
0x742ac3 symbol_table::compile()
/data/gcc-7.4.0/gcc/cgraphunit.c:2530
0x744b16 symbol_table::compile()
/data/gcc-7.4.0/gcc/cgraphunit.c:2629
0x744b16 symbol_table::finalize_compilation_unit()
/data/gcc-7.4.0/gcc/cgraphunit.c:2626
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
ICE occurs with 7.4 and higher, where the -fdec-structure and -finit-derived
options were introduced.
The ICE occurs at -O0 but not for higher optimization levels. The ICE occurs
only when there are (8*2^n) fields preceding the union, regardless of which
fields are in the union.
