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From: "fx at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/100725] New: dwarf error with --whole-program
Date: Sat, 22 May 2021 14:37:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100725

            Bug ID: 100725
           Summary: dwarf error with --whole-program
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fx at gnu dot org
  Target Milestone: ---

Extending my example in #100724 with -g, I see a dwarf error, which I assum=
e is
a separate issue:

$ cat test.f90
module tw
  interface
     real function twice (x)
     end function twice
  end interface
end module tw

real function twice (x)
  twice =3D 2*x
end function twice

use tw
read *, x
print *, twice (x)
end
$ gfortran-11 -O2 -g -fwhole-program test.f90
/usr/bin/ld: /usr/bin/ld: DWARF error: can't find .debug_ranges section.
/tmp/cc8sFtAX.o: in function `MAIN__':
test.f90:(.text+0x7f): undefined reference to `twice_'
collect2: error: ld returned 1 exit status

Changing -g to -gdwarf-4 avoids the error, as does removing -fwhole-program=
.=20
It also works with gcc-10 and -gdwarf-5.  The system is Debian 10 amd64
(binutils 2.31.1, if that matters).=