Reply to all so the list sees this.
W.r.t. not getting through on the list. I've looked at the list config,
can't find a reason. I received this message only directly, not via the
list. I've added your E-mail address to the "explicitly allowed"
addresses, so maybe it'll work from now.
Danny
On Mon, 2009-05-18 at 19:47 +0100, Dave Korn wrote:
> Danny Backx wrote:
> > What does this do ?
>
> It's part of addressing GCC PR37216[*], which is caused by it not being
> possible in the PE format to specify an alignment for variables located in the
> COMMON section. This can cause vector operands passed to SSE instructions to
> be insufficiently aligned.
>
> It enables the use of the ELF-style 3-operand form of ".comm" in the
> assembler, which causes it to emit an entry in the ".drectve" session that
> looks like "-aligncomm:<symbolname>,N" where <symbolname> is the (mangled)
> symbol name and N is the power-of-two aignment to use.
>
> The commands in the .drectve section are then recognized downstream by LD at
> final link time, when it allocates space for COMMON variables, and used to
> align them correctly.
>
> This is a GNU extension that should be backwardly-compatible with native
> tools at least to the extent that they will still link files using it, albeit
> that they won't be any more able than they currently are to align data in
> COMMON space. Also, they may well warn about unknown ".drectve" commands;
> this can easily be resolved by not using the extension but falling back on the
> only current workaround, which is to use "-fno-common" instead, for anyone for
> whom it matters.
>
> cheers,
> DaveK
>
> PS. My emails so far have been getting bounced by the list, despite having
> subbed up earlier. Feel free to forward this one on if it doesn't show up in
> the archives; I've Cc'd you both personally so it won't get completely lost.
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
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