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Date: Mon, 22 Aug 2011 19:19:00 -0000
Message-ID: <CAMe9rOpsU-5wkLp=5R23HD02OWAgUTjKL1YTnqatffKcnP_WgA@mail.gmail.com>
Subject: Re: PING: PATCH: PR target/46770: Use .init_array/.fini_array sections
From: "H.J. Lu" <hjl.tools@gmail.com>
To: "Joseph S. Myers" <joseph@codesourcery.com>
Cc: Jakub Jelinek <jakub@redhat.com>, David Edelsohn <dje.gcc@gmail.com>, 	GCC Patches <gcc-patches@gcc.gnu.org>
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On Mon, Aug 22, 2011 at 11:53 AM, Joseph S. Myers
<joseph@codesourcery.com> wrote:
> On Mon, 22 Aug 2011, H.J. Lu wrote:
>
>> On Sun, Aug 21, 2011 at 10:37 PM, Jakub Jelinek <jakub@redhat.com> wrote:
>> nd/or add another test to it that tests
>> > that you can actually use
>> > .section .init_array
>> > and it will use correct section flags for the section.
>> >
>>
>> We need this information in config.gcc. But config.gcc is used
>> before assembler and readelf are detected. I am running out of
>> ideas. =A0Any suggestions?
>
> Require a good assembler on ELF targets and just enable this by default
> for them without trying a configure test that won't work for cross
> compilation (AC_RUN_IFELSE is bad).
>
> The toplevel config/elf.m4 provides a good notion of what is or is not
> ELF (if there are problems, we can fix that file). =A0Only a handful of
> targets support non-GNU assemblers; for the vast bulk of targets we should
> assume a not-too-old GNU assembler. =A0That way, the configure test can be
> used to cause a configure-time error if the assembler is defective and it
> doesn't matter that the test is late.
>

A working .init_array support needs assembler, linker and libc.
That is why AC_RUN_IFELSE is used.

--=20
H.J.