#12738: Singular fails to build with LTO
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Reporter: SimonKing | Owner:
tbd
Type: defect | Status:
new
Priority: major | Milestone:
sage-5.0
Component: packages | Resolution:
Keywords: singular lto gcc | Work issues:
Report Upstream: Reported upstream. Little or no feedback. | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by leif):
Replying to [comment:15 SimonKing]:
> Replying to [comment:14 leif]:
> > Replying to [comment:13 SimonKing]:
> > > Just as I wrote the previous comment, building Singular failed
again, with the same error `in lto_varpool_replace_node, bei lto-
symtab.c:304`.
> >
> > As expected... :-(
>
> Why expected? I thought that the problem is that Singular does not take
LDFLAGS into account!
Because dropping `-flto` shouldn't have any effect except that LTO simply
won't happen.
Of course there are some other effects, e.g. regarding the size of the
object files (and of course compile time), depending on ''where'' you drop
it, if not everywhere.
`-flto` ''during compilation'' just prepares the generated object files
for LTO (i.e., adds the extra information needed later); `-flto` during
the link phase then triggers LTO. If some object files or libraries lack
the special sections needed, they're just excluded from LTO, as there's no
information available on them. This is very similar to compiling with
`-g`, and later using the debugger.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12738#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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