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Re: Linker plugins should be aware of --defsym during symbol resolution

From: Cary Coutant <ccoutant at gmail dot com>
To: Teresa Johnson <tejohnson at google dot com>
Cc: Sriraman Tallam <tmsriram at google dot com>, binutils <binutils at sourceware dot org>, David Li <davidxl at google dot com>
Date: Thu, 15 Feb 2018 14:28:05 -0800
Subject: Re: Linker plugins should be aware of --defsym during symbol resolution
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References: <CAAs8HmztRc_qZ3Kqxf1EwQ+mTPZnpoUs0cSRvda_wYnES++pCQ@mail.gmail.com> <CAAs8HmwHSePozy-kRgsBJW9f8g4wKqV6dqdZnMYDBK+WXy8OOQ@mail.gmail.com> <CAJimCsG3uYRF_8FW15bA1s3ePS53398yJQGTvWaSGYrk9hy6-w@mail.gmail.com> <CAAe5K+Usqjr8=PyRk7UDuUCFZJop4Ysq-_pwtFbao_cq+1orwg@mail.gmail.com> <CAJimCsEpbj-esp_-gu--u2MTdQ1LzNAoJ1F_D=70CdWLh73HeA@mail.gmail.com> <CAAe5K+Xr7SFuS2fWdezx3ciKKG3JxpOVn+DFicurgGJifqf9Qw@mail.gmail.com> <CAJimCsE1BeJNMXnSxvNVEp9tZUXD279-=cdWBDLEwEhF+9asqA@mail.gmail.com> <CAAe5K+VNCF+R+AUuraeLjzFJLq07KratFyJvMOVeyfhW9bD3vw@mail.gmail.com>

> Fair enough. It was a contrived example, not based on anything I have seen
> so far. If that violates ODR then I agree all bets are off.

BTW, Ian wrote this comment in script.cc:

// The GNU linker lets symbol assignments in the linker script
// silently override defined symbols in object files.  We are
// compatible.  FIXME: Should we issue a warning?

I think this is a misfeature, and the comment suggests that Ian thought so too.

-cary

Follow-Ups:
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Alan Modra

References:
- Linker plugins should be aware of --defsym during symbol resolution
  - From: Sriraman Tallam via binutils
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Sriraman Tallam via binutils
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Cary Coutant
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Teresa Johnson via binutils
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Cary Coutant
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Teresa Johnson via binutils
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Cary Coutant
- Re: Linker plugins should be aware of --defsym during symbol resolution
  - From: Teresa Johnson via binutils

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