https://sourceware.org/bugzilla/show_bug.cgi?id=24873
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amodra at gmail dot com
Summary|ld.bfd fails if -lm is |gcc -flto objects result in
|included only once within |--start-group … --end-group
|--start-group … --end-group |failure to include
| |--as-needed libraries
--- Comment #2 from Alan Modra <amodra at gmail dot com> ---
What isn't obvious from the bug description until you go looking at the
reference given in comment #1, is that this bug is about linking gcc -flto
objects. I've updated the subject line to reflect this. Adding LTO recompiled
objects back into the link is *seriously* complicated. We might not be able to
fix this problem.
ld.gold succeeds because gold doesn't check that you've added necessary DSOs on
the command line. (Of course, you have in fact mentioned -lm on the command
line but ld.bfd is getting confused.)
Without looking at a testcase I can't answer why using two -lm works, and
perhaps the link would work if a single -lm was used at the location of the
second -lm.
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