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Re: [Tinycc-devel] alinged/unaligned on OpenBSD

From: grischka
Subject: Re: [Tinycc-devel] alinged/unaligned on OpenBSD
Date: Mon, 25 Jan 2021 18:55:05 +0100
User-agent: Thunderbird (Windows/20090812)

Herman ten Brugge via Tinycc-devel wrote:
The problem is that packed structeres should probably always use
single_byte code.
For example:
struct __attribute__((packed)) {
  char a;
  int b;
} s;

  s.b = 3;
Also fails to run on arm32 (openbsd).
I do not have a solution. But maybe Grischka can solve this?

Don't know, maybe look what gcc does?

However, with your example, for example, one could take the address
    int *p = &s.b;
and pass that to other functions, as well.  There is not much
that the compiler could do.

For the 96_nodata_wanted test using 'packed' or not probably would
not make much difference, at least on ARM.  Maybe it was supposed
to test single-byte access under code suppression.  But why shouldn't
it work anyway.

--- grischka


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