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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/101918] LTO type mismatches for runtime library
 functions in mixed -fdefault-real-8 projects
Date: Mon, 16 Aug 2021 21:34:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101918

--- Comment #6 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Mon, Aug 16, 2021 at 06:49:54PM +0000, anlauf at gcc dot gnu.org wrote:
>=20
> > subroutine foo4
> >   implicit none
> >   real(4) :: ar(2,3), v(1)
>=20
> That should have read:
>=20
>   real :: ar(2,3), v(1)
>=20

Ah, yes!  Another reason that -fdefault-real-8 should be
deleted from gfortran.  Presumably, the real(4) version
will break with -freal-4-real-8.  Oh well, these option
are meant to be aidis while someone ports a code from
one precision to another.=