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From: "jvb at cyberscience dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/61577] [4.9.0 Regression] can't compile on hp-ux v3
 ia64
Date: Wed, 14 Jul 2021 08:35:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61577

--- Comment #232 from John Buddery <jvb at cyberscience dot com> ---
The #undef MAKE_DECL_ONE_ONLY is only for older builds, it's not needed with
the gcc 11 patches.

It was an alternative single line fix which works for 4.7.2 and 4.9.4, which
you need to build if you're starting from scratch.

This was never really the right fix, and as support for systems without
MAKE_DECL_ONE_ONLY has deteriorated in later versions it became harder and
harder to  follow this route. I did get some intermediate versions working =
with
a lot of hacking, but for any vaguely recent release I would recommend using
the 11.1 patches instead.=