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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/101918] LTO type mismatches for runtime library
 functions in mixed -fdefault-real-8 projects
Date: Mon, 30 Aug 2021 14:39:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101918

--- Comment #10 from kargl at gcc dot gnu.org ---
(In reply to Rimvydas (RJ) from comment #8)
> If we can agree that use of -fdefault-real-8 -fdefault-double-8 with -flto
> does not magically recompile intrinsic subroutines in runtime libgfortran=
.so
> library, it looks like it is a frontend issue not providing correct
> information for LTO.

No, it is not a frontend issue.  It is a user expectation issues.


> $ gfortran -Wall -Wextra -flto -fdefault-real-8 -fdefault-double-8 -c bar=
.f90
> $ gfortran -Wall -Wextra -flto foo.f90 bar.o

You need to use -fdefault-real-8 -fdefault-double-8 when compiling both
files.  How is the 2nd invocation of gfortran to know that your first
invocation of gfortran used imcompatiable options?=