On Thu, Apr 12, 2018 at 10:19:38PM +0100, John Ballance wrote:
> Advice appreciated
> I have recently built gcc etc on a (more modern) linux machine.
> build seems fine
> gcc version reports as arm-unknown-riscos-gcc (GCCSDK GCC 4.7.4 Release 3)
> 4.7.4
> However the __builtin_shuffle built in function appear missing (as needed at
> libfreetype6 src/sfnt/pngshim.c
> The package builds fine in jenkins on ci.riscos.info so I have to assume
> something failed or is configured out in my build

The build on ci.riscos.info was 9 months old and didn't work.
I just built it again and it reports:

./builds/unix/libtool --mode=compile /home/riscos/env/arm-unknown-riscos-gcc 
-pedantic -ansi 
  -c -Wall -O3 -I/home/riscos/env/include   -DFT_CONFIG_OPTION_SYSTEM_ZLIB  
-DFT_CONFIG_MODULES_H="<ftmodule.h>"  -o 
In file included from 
 In function 'premultiply_data':
 internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gccsdk.riscos.info/> for instructions.

so something Isn't Happy.  But I'm not sure if it's a different kind of Not
Happy from what you're seeing.

The build is picking up some antique dependencies, so I'm rebuilding those
to see if that makes a difference.

I don't think the changes I made recently (supporting a new gperf, allowing
automake to run with a newer perl) will have materially changed things.  The
ci.riscos.info build environment at least hasn't changed.

It seems the last successful build in Jenkins was the Debian 'stretch'
package which was libfreetype6 2.6.3, while the current attempt is 'buster's
2.8.1.  In the interim the __builtin_shuffle code was introduced.

So I suspect GCC's __builtin_shuffle is indeed broken in some way.
Does anyone know about this code?

There is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59378
but that relates to C++.

A workaround is to patch libfreetype6 to avoid the use of __builtin_shuffle.


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