Bug#876825: gcc: infinite loop targeting armel

[Adrian Bunk <bunk@debian.org>]

On Tue, Sep 26, 2017 at 09:48:52AM +0100, Edmund Grimley Evans wrote:
>...
> This is not specific to cross-compiling and not even to gcc-6.
> 
> We noticed the infinite loop when the buildd tries to build rnahybrid:
> 
> https://buildd.debian.org/status/logs.php?pkg=rnahybrid&arch=armel
>...

In addition to not being an infinite loop, it is also not only armel.

armhf does not hit the 150 minute timeout, but it also has a factor 10 
in the build time with gcc 5 -> 6 for literally the same sources:
  https://buildd.debian.org/status/logs.php?pkg=rnahybrid&arch=armhf

There is no such gcc 5 -> 6 performance regression for rnahybrid visible 
on the buildds of any other (release or ports) architecture, so this
performance regression seems to be specific to 32bit ARM.

cu
Adrian

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