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Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h

From: Sam McCall <sam dot mccall at gmail dot com>
To: Jonathan Wakely <jwakely dot gcc at gmail dot com>
Cc: zhaixiang at loongson dot cn, kim dot grasman at gmail dot com, rguenth at gcc dot gnu dot org, llvm-dev at lists dot llvm dot org, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Thu, 9 Aug 2018 13:25:24 +0200
Subject: Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
References: <CANt7B+dnBTK75FOqO+TcgvdcDZm9zv0WAawxx+XEHNMuMkdHuA@mail.gmail.com> <55c64df9-54ca-9cd4-670e-2439a7fc9095@loongson.cn> <CAH6eHdRoh9a0fhnNJMSL2sD894672x5xK-K-dscaAMeq=1xyzQ@mail.gmail.com> <2a9e8517-a9cf-30cd-81d8-17f9ec7b71ba@loongson.cn> <CAH6eHdSbNciy9uZ6dPZ8LMwzJUo2h1EZczyp30u0i803MjEskw@mail.gmail.com>

Author of the problematic code here. Thanks everyone, and sorry to have
caused difficulty!

Obviously if there really is something illegal here we should fix it in
LLVM, but it looks like this warning is a false positive (anyone disagree?)

Still if there's a simple source-level workaround, or we can suppress the
warning with a #pragma, I'd be happy to do that. GCC 4.9.3 is a supported
compiler for LLVM and the more configurations we build cleanly in, the
better.

If this is a useful direction, could someone with an affected environment
send me a small patch? I don't have the right setup to verify myself.

Cheers, Sam

Follow-Ups:
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Leslie Zhai
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Kim Gräsman

References:
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Leslie Zhai
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Jonathan Wakely
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Leslie Zhai
- Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h
  - From: Jonathan Wakely

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