Failure to dlopen libgomp due to static TLS data

Jakub Jelinek jakub@redhat.com
Thu Feb 12 16:11:00 GMT 2015


On Thu, Feb 12, 2015 at 11:09:59AM -0500, Rich Felker wrote:
> On Thu, Feb 12, 2015 at 04:18:57PM +0100, Ulrich Weigand wrote:
> > Hello,
> > 
> > we're running into a problem related to use of initial-exec access to
> > TLS variables in dynamically-loaded libraries.  Now, in general, this
> > is actually not supported.  However, there seems to an "inofficial"
> > extension that allows selected system libraries to use small amounts
> > of static TLS space to allow critical variables to be defined to use
> > the initial-exec model even in dynamically-loaded libraries.
> 
> This usage is supposed to be deprecated. Why isn't libgomp using
> TLSDESC/gnu2 model?

Because it is significantly slower.

	Jakub



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