I am encountering a linker error when compiling with ports-gcc Fortran:
ld: error: lbug2.f90:(function MAIN__: .text+0x80): relocation R_X86_64_PC32
out o
f range: 2456507324 is not in [-2147483648, 2147483647]
The code has several large arrays, the total size of which exceeds 2GB.
Is this a linker issue, a gcc fortran issue, or a pebkac?
$ cat lbug1.f90
program lbug
implicit none
save
real r3(ng,ng,ng)
print *,'hello bug'
! essential:
call someexternal(r3,3)
print *,r3(3,3,3)
endprogram
$ cat lbuge.f90
subroutine someexternal(a,b)
endsubroutine
$ echo $(( 4* 850*850*850 ))
2456500000
$# the memory use of array r3 exceeds 2^31 bytes
$ egfortran -cpp -Dng=850 lbug1.f90 -c
$ egfortran -c lbuge.f90
$ egfortran lbug1.o lbuge.o
o66$ ./a.out
hello bug
0.00000000
The object files are linked into separate files so we can examine with
$ objdump --syms lbug1.o | grep -B 1 -A 2 r3
0000000000000000 l F .text 0000000000000116 MAIN__
0000000000000000 l O .bss 00000000926b3720 r3.3768
0000000000000030 l O .rodata 000000000000001c options.2.3777
0000000000000000 l d .eh_frame 0000000000000000 .eh_frame
$ cat lbug2.f90
program lbug
implicit none
save
real r3(ng,ng,ng)
complex c3(ng/2,ng,ng)
print *,'hello bug'
! essential:
call someexternal(r3,c3)
print *,r3(3,3,3), ubound(r3)
endprogram
$ egfortran -cpp -Dng=850 lbug2.f90 -c
$ egfortran -cpp -Dng=850 lbuge.f90 -c
$ egfortran lbug2.o lbuge.o
ld: error: lbug2.f90:(function MAIN__: .text+0x80): relocation R_X86_64_PC32
out of range: 2456507324 is not in [-2147483648, 2147483647]
$ objdump --syms lbug2.o | grep -B 1 -A 2 r3
00000000926b3720 l O .bss 00000000926b3720 c3.3768
0000000000000000 l O .bss 00000000926b3720 r3.3770
0000000000000028 l O .rodata 000000000000000c A.2.3775
0000000000000040 l O .rodata 000000000000001c options.4.3783
It seems the compiler generates 64-bit offsets but the linker limits itself
to 32-bit offsets. Is this correct? Is there a fix?
John
Environment:
$ sysctl kern.version
kern.version=OpenBSD 6.6 (GENERIC.MP) #0: Sat Oct 26 08:08:07 MDT 2019
r...@syspatch-66-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
$ sysctl hw
hw.machine=amd64
hw.model=Intel(R) Core(TM) i3-6100U CPU @ 2.30GHz
hw.ncpu=2
$ pkg_info | grep g95
g95-8.3.0p4 GNU compiler collection: f95 compiler
