Re: [PATCH] Add native windows on arm64 support

From: Niyas Sait <niyas(dot)sait(at)linaro(dot)org>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: [PATCH] Add native windows on arm64 support
Date: 2022-04-21 09:21:04
Message-ID: CAFPTBD8Mk0X3h0UhWDbN7dLf1-eFeqcE8Qe3SUKzH9b+Gj1kBg@mail.gmail.com
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> Why does it not allow that? Is that just a limitation of the
> compiler? If yes, what is the error happening? This question is not
> exactly answered yet as of this thread. I may be missing a reference
> about that in the upstream docs, but I see nowhere an explanation
> about the reason and the why. That's also one of the first questions
> from Thomas upthread.

The following error occurs:

LINK : fatal error LNK1246: '/DYNAMICBASE:NO' not compatible with 'ARM64'
target machine; link without '/DYNAMICBASE:NO

This seems to be a deliberate restriction for Arm64 targets. However, no
references were provided. To clarify, I have posted a question [1] on the
community channel of Visual Studio.

Niyas

[1]
https://developercommunity.visualstudio.com/t/LINK-:-fatal-error-LNK1246:-DYNAMICBAS/10020163

On Thu, 21 Apr 2022 at 05:07, Michael Paquier <michael(at)paquier(dot)xyz> wrote:

> On Wed, Apr 20, 2022 at 10:43:06AM +0100, Niyas Sait wrote:
> >> This issue is still lying around, and you may have been lucky. Would
> >> there be any issues to remove this change to get a basic support in?
> >> As mentioned upthread, there is a long history of Postgres with ASLR.
> >
> > MSVC linker doesn't allow non-random base addresses for Arm64 platforms.
> > It is needed for basic support.
>
> Why does it not allow that? Is that just a limitation of the
> compiler? If yes, what is the error happening? This question is not
> exactly answered yet as of this thread. I may be missing a reference
> about that in the upstream docs, but I see nowhere an explanation
> about the reason and the why. That's also one of the first questions
> from Thomas upthread.
> --
> Michael
>

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