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Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]

From: Florian Weimer <fweimer at redhat dot com>
To: Jeff Law <law at redhat dot com>
Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, Joseph Myers <joseph at codesourcery dot com>, GNU C Library <libc-alpha at sourceware dot org>
Date: Mon, 17 Jun 2019 21:11:57 +0200
Subject: Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
References: <CAMe9rOoP_293SM=sYpuqx5Yg9K1a-F9GtN6g0DDFjHTZM5OkcA@mail.gmail.com> <alpine.DEB.2.21.1906101545000.29610@digraph.polyomino.org.uk> <CAMe9rOoyj_b=zWkUgcSKLxPLEuBA0Y9-75v+xqg0yT4HDXy56Q@mail.gmail.com> <87sgsg3yax.fsf@oldenburg2.str.redhat.com> <CAMe9rOpJ9J2LNNKwxP0QYgVJA0Ep9TWA21s_GNqacFPpfFx8Pg@mail.gmail.com> <CAMe9rOq1LqNOP4=yr5DCA=HyK+3wBqdW+FtRGLY1pWfgoEYDHA@mail.gmail.com> <87k1ds3xo3.fsf@oldenburg2.str.redhat.com> <87a7ektgjp.fsf@oldenburg2.str.redhat.com> <104ead0a-623d-6fea-ef3e-55bc3dc83459@redhat.com> <CAMe9rOqvb69AkKs8Zo-XUAme=JWm+=Pdxk99p1wnDYB6kuUpTQ@mail.gmail.com> <6eff631b-c039-f726-18e8-28231d398e59@redhat.com>

* Jeff Law:

> ISTM that 8, 9, 10 would use the new flag.  11 would issue an error
> which would trigger a reinvestigation roughly a year from now.

Do you suggest to put in a #warning for GCC 11, so that people can
configure with --disable-werror and still build with GCC 11?

Given that GCC 11 will probably add other warnings that break the build,
this proposal isn't entirely unreasonable (even though I generally
dislike such time bombs).

Thanks,
Florian

Follow-Ups:
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Joseph Myers
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: H.J. Lu

References:
- [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128
  - From: H.J. Lu
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128
  - From: Joseph Myers
- [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: H.J. Lu
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Florian Weimer
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: H.J. Lu
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: H.J. Lu
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Florian Weimer
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Florian Weimer
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Jeff Law
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: H.J. Lu
- Re: [PATCH] x86-64: Compile branred.c with -mprefer-vector-width=128 [BZ #24603]
  - From: Jeff Law

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