Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).

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I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?

Regards,
Anders

> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
> 
> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.

========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 31 May 2016, at 10:06, Anders Genell  wrote:
> 
> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
> 
> Regards,
> Anders
> 
>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>> 
>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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Hm. I'm likely out of my depth here...
The cpu seems neon capable:

chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 2 (v7l)
BogoMIPS        : 1001.88
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc08
CPU revision    : 2

Hardware        : Allwinner sun4i/sun5i Families
Revision        : 0000

How do I make sure the tool chain has neon support?

Regards,
Anders

> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
> 
> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
> 
> ========================
> Dr Victor Lazzarini
> Dean of Arts, Celtic Studies and Philosophy,
> Maynooth University,
> Maynooth, Co Kildare, Ireland
> Tel: 00 353 7086936
> Fax: 00 353 1 7086952 
> 
>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>> 
>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>> 
>> Regards,
>> Anders
>> 
>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>> 
>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?

Regards, 
Anders

> 31 maj 2016 kl. 20:28 skrev Anders Genell :
> 
> Hm. I'm likely out of my depth here...
> The cpu seems neon capable:
> 
> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
> processor       : 0
> model name      : ARMv7 Processor rev 2 (v7l)
> BogoMIPS        : 1001.88
> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
> CPU implementer : 0x41
> CPU architecture: 7
> CPU variant     : 0x3
> CPU part        : 0xc08
> CPU revision    : 2
> 
> Hardware        : Allwinner sun4i/sun5i Families
> Revision        : 0000
> 
> How do I make sure the tool chain has neon support?
> 
> Regards,
> Anders
> 
>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>> 
>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>> 
>> ========================
>> Dr Victor Lazzarini
>> Dean of Arts, Celtic Studies and Philosophy,
>> Maynooth University,
>> Maynooth, Co Kildare, Ireland
>> Tel: 00 353 7086936
>> Fax: 00 353 1 7086952 
>> 
>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>> 
>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>> 
>>> Regards,
>>> Anders
>>> 
>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>> 
>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>> 
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here

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Here are some pointers:

1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.

2. Open the file. You will see this line:

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)

This is where the C compiler flags can be set. Change it to something like

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)

then build as usual

If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.

Regards
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 31 May 2016, at 20:00, Anders Genell  wrote:
> 
> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
> 
> Regards, 
> Anders
> 
>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>> 
>> Hm. I'm likely out of my depth here...
>> The cpu seems neon capable:
>> 
>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>> processor       : 0
>> model name      : ARMv7 Processor rev 2 (v7l)
>> BogoMIPS        : 1001.88
>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>> CPU implementer : 0x41
>> CPU architecture: 7
>> CPU variant     : 0x3
>> CPU part        : 0xc08
>> CPU revision    : 2
>> 
>> Hardware        : Allwinner sun4i/sun5i Families
>> Revision        : 0000
>> 
>> How do I make sure the tool chain has neon support?
>> 
>> Regards,
>> Anders
>> 
>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>>> 
>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>> 
>>> ========================
>>> Dr Victor Lazzarini
>>> Dean of Arts, Celtic Studies and Philosophy,
>>> Maynooth University,
>>> Maynooth, Co Kildare, Ireland
>>> Tel: 00 353 7086936
>>> Fax: 00 353 1 7086952 
>>> 
>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>>> 
>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>> 
>>>> Regards,
>>>> Anders
>>>> 
>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>>> 
>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>> 
>>>>> Csound mailing list
>>>>> Csound@listserv.heanet.ie
>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>> Send bugs reports to
>>>>>    https://github.com/csound/csound/issues
>>>>> Discussions of bugs and features can be posted here
>>>> 
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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Send bugs reports to
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Ok, after trying a bit it seems I really cannot get it to work. 

The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...

Are there versions of neon, so that csound includes support for one but not another?

Regards,
Anders 

> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini :
> 
> Here are some pointers:
> 
> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
> 
> 2. Open the file. You will see this line:
> 
> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
> 
> This is where the C compiler flags can be set. Change it to something like
> 
> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
> 
> then build as usual
> 
> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
> 
> Regards
> ========================
> Dr Victor Lazzarini
> Dean of Arts, Celtic Studies and Philosophy,
> Maynooth University,
> Maynooth, Co Kildare, Ireland
> Tel: 00 353 7086936
> Fax: 00 353 1 7086952 
> 
>> On 31 May 2016, at 20:00, Anders Genell  wrote:
>> 
>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>> 
>> Regards, 
>> Anders
>> 
>>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>>> 
>>> Hm. I'm likely out of my depth here...
>>> The cpu seems neon capable:
>>> 
>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>>> processor       : 0
>>> model name      : ARMv7 Processor rev 2 (v7l)
>>> BogoMIPS        : 1001.88
>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>>> CPU implementer : 0x41
>>> CPU architecture: 7
>>> CPU variant     : 0x3
>>> CPU part        : 0xc08
>>> CPU revision    : 2
>>> 
>>> Hardware        : Allwinner sun4i/sun5i Families
>>> Revision        : 0000
>>> 
>>> How do I make sure the tool chain has neon support?
>>> 
>>> Regards,
>>> Anders
>>> 
>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>>>> 
>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>>> 
>>>> ========================
>>>> Dr Victor Lazzarini
>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>> Maynooth University,
>>>> Maynooth, Co Kildare, Ireland
>>>> Tel: 00 353 7086936
>>>> Fax: 00 353 1 7086952 
>>>> 
>>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>>>> 
>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>>> 
>>>>> Regards,
>>>>> Anders
>>>>> 
>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>>>> 
>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>>> 
>>>>>> Csound mailing list
>>>>>> Csound@listserv.heanet.ie
>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>> Send bugs reports to
>>>>>>   https://github.com/csound/csound/issues
>>>>>> Discussions of bugs and features can be posted here
>>>>> 
>>>>> Csound mailing list
>>>>> Csound@listserv.heanet.ie
>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>> Send bugs reports to
>>>>>    https://github.com/csound/csound/issues
>>>>> Discussions of bugs and features can be posted here
>>>> 
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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Send bugs reports to
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Discussions of bugs and features can be posted here

The neon extensions are defined by an API that I think is common to all hardware that implement it. 
Did you try just adding -mfpu=neon to see what happens (leaving the other flag)? Also why is ‘hard’ not compiling,
what errors are you getting?

Otherwise, you will need to try and look it up on the interweb, see for instance

https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=98354

It looks like it should be definitely possible.
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 2 Jun 2016, at 16:36, Anders Genell  wrote:
> 
> Ok, after trying a bit it seems I really cannot get it to work. 
> 
> The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...
> 
> Are there versions of neon, so that csound includes support for one but not another?
> 
> Regards,
> Anders 
> 
>> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini :
>> 
>> Here are some pointers:
>> 
>> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
>> 
>> 2. Open the file. You will see this line:
>> 
>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
>> 
>> This is where the C compiler flags can be set. Change it to something like
>> 
>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
>> 
>> then build as usual
>> 
>> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
>> 
>> Regards
>> ========================
>> Dr Victor Lazzarini
>> Dean of Arts, Celtic Studies and Philosophy,
>> Maynooth University,
>> Maynooth, Co Kildare, Ireland
>> Tel: 00 353 7086936
>> Fax: 00 353 1 7086952 
>> 
>>> On 31 May 2016, at 20:00, Anders Genell  wrote:
>>> 
>>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>>> 
>>> Regards, 
>>> Anders
>>> 
>>>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>>>> 
>>>> Hm. I'm likely out of my depth here...
>>>> The cpu seems neon capable:
>>>> 
>>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>>>> processor       : 0
>>>> model name      : ARMv7 Processor rev 2 (v7l)
>>>> BogoMIPS        : 1001.88
>>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>>>> CPU implementer : 0x41
>>>> CPU architecture: 7
>>>> CPU variant     : 0x3
>>>> CPU part        : 0xc08
>>>> CPU revision    : 2
>>>> 
>>>> Hardware        : Allwinner sun4i/sun5i Families
>>>> Revision        : 0000
>>>> 
>>>> How do I make sure the tool chain has neon support?
>>>> 
>>>> Regards,
>>>> Anders
>>>> 
>>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>>>>> 
>>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>>>> 
>>>>> ========================
>>>>> Dr Victor Lazzarini
>>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>>> Maynooth University,
>>>>> Maynooth, Co Kildare, Ireland
>>>>> Tel: 00 353 7086936
>>>>> Fax: 00 353 1 7086952 
>>>>> 
>>>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>>>>> 
>>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>>>> 
>>>>>> Regards,
>>>>>> Anders
>>>>>> 
>>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>>>>> 
>>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>>>> 
>>>>>>> Csound mailing list
>>>>>>> Csound@listserv.heanet.ie
>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>> Send bugs reports to
>>>>>>>  https://github.com/csound/csound/issues
>>>>>>> Discussions of bugs and features can be posted here
>>>>>> 
>>>>>> Csound mailing list
>>>>>> Csound@listserv.heanet.ie
>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>> Send bugs reports to
>>>>>>   https://github.com/csound/csound/issues
>>>>>> Discussions of bugs and features can be posted here
>>>>> 
>>>>> Csound mailing list
>>>>> Csound@listserv.heanet.ie
>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>> Send bugs reports to
>>>>>    https://github.com/csound/csound/issues
>>>>> Discussions of bugs and features can be posted here
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

Csound mailing list
Csound@listserv.heanet.ie
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Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Thanks! I'll try a little more to see what I can find. Maybe I should start a separate thread/ticket to keep this from obfuscating the OP's (solved) issue?

Regards,
Anders

> 2 juni 2016 kl. 18:02 skrev Victor Lazzarini :
> 
> The neon extensions are defined by an API that I think is common to all hardware that implement it. 
> Did you try just adding -mfpu=neon to see what happens (leaving the other flag)? Also why is ‘hard’ not compiling,
> what errors are you getting?
> 
> Otherwise, you will need to try and look it up on the interweb, see for instance
> 
> https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=98354
> 
> It looks like it should be definitely possible.
> ========================
> Dr Victor Lazzarini
> Dean of Arts, Celtic Studies and Philosophy,
> Maynooth University,
> Maynooth, Co Kildare, Ireland
> Tel: 00 353 7086936
> Fax: 00 353 1 7086952 
> 
>> On 2 Jun 2016, at 16:36, Anders Genell  wrote:
>> 
>> Ok, after trying a bit it seems I really cannot get it to work. 
>> 
>> The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...
>> 
>> Are there versions of neon, so that csound includes support for one but not another?
>> 
>> Regards,
>> Anders 
>> 
>>> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini :
>>> 
>>> Here are some pointers:
>>> 
>>> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
>>> 
>>> 2. Open the file. You will see this line:
>>> 
>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
>>> 
>>> This is where the C compiler flags can be set. Change it to something like
>>> 
>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
>>> 
>>> then build as usual
>>> 
>>> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
>>> 
>>> Regards
>>> ========================
>>> Dr Victor Lazzarini
>>> Dean of Arts, Celtic Studies and Philosophy,
>>> Maynooth University,
>>> Maynooth, Co Kildare, Ireland
>>> Tel: 00 353 7086936
>>> Fax: 00 353 1 7086952 
>>> 
>>>> On 31 May 2016, at 20:00, Anders Genell  wrote:
>>>> 
>>>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>>>> 
>>>> Regards, 
>>>> Anders
>>>> 
>>>>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>>>>> 
>>>>> Hm. I'm likely out of my depth here...
>>>>> The cpu seems neon capable:
>>>>> 
>>>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>>>>> processor       : 0
>>>>> model name      : ARMv7 Processor rev 2 (v7l)
>>>>> BogoMIPS        : 1001.88
>>>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>>>>> CPU implementer : 0x41
>>>>> CPU architecture: 7
>>>>> CPU variant     : 0x3
>>>>> CPU part        : 0xc08
>>>>> CPU revision    : 2
>>>>> 
>>>>> Hardware        : Allwinner sun4i/sun5i Families
>>>>> Revision        : 0000
>>>>> 
>>>>> How do I make sure the tool chain has neon support?
>>>>> 
>>>>> Regards,
>>>>> Anders
>>>>> 
>>>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>>>>>> 
>>>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>>>>> 
>>>>>> ========================
>>>>>> Dr Victor Lazzarini
>>>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>>>> Maynooth University,
>>>>>> Maynooth, Co Kildare, Ireland
>>>>>> Tel: 00 353 7086936
>>>>>> Fax: 00 353 1 7086952 
>>>>>> 
>>>>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>>>>>> 
>>>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>>>>> 
>>>>>>> Regards,
>>>>>>> Anders
>>>>>>> 
>>>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>>>>>> 
>>>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>>>>> 
>>>>>>>> Csound mailing list
>>>>>>>> Csound@listserv.heanet.ie
>>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>>> Send bugs reports to
>>>>>>>> https://github.com/csound/csound/issues
>>>>>>>> Discussions of bugs and features can be posted here
>>>>>>> 
>>>>>>> Csound mailing list
>>>>>>> Csound@listserv.heanet.ie
>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>> Send bugs reports to
>>>>>>>  https://github.com/csound/csound/issues
>>>>>>> Discussions of bugs and features can be posted here
>>>>>> 
>>>>>> Csound mailing list
>>>>>> Csound@listserv.heanet.ie
>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>> Send bugs reports to
>>>>>>   https://github.com/csound/csound/issues
>>>>>> Discussions of bugs and features can be posted here
>>>> 
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Not sure it warrants an issue, but if you feel you'd like to open it, go ahead.

Note that we can't build this because we do not have the hardware or cross-compiler.

Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland

> On 2 Jun 2016, at 18:22, Anders Genell  wrote:
> 
> Thanks! I'll try a little more to see what I can find. Maybe I should start a separate thread/ticket to keep this from obfuscating the OP's (solved) issue?
> 
> Regards,
> Anders
> 
>> 2 juni 2016 kl. 18:02 skrev Victor Lazzarini :
>> 
>> The neon extensions are defined by an API that I think is common to all hardware that implement it. 
>> Did you try just adding -mfpu=neon to see what happens (leaving the other flag)? Also why is ‘hard’ not compiling,
>> what errors are you getting?
>> 
>> Otherwise, you will need to try and look it up on the interweb, see for instance
>> 
>> https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=98354
>> 
>> It looks like it should be definitely possible.
>> ========================
>> Dr Victor Lazzarini
>> Dean of Arts, Celtic Studies and Philosophy,
>> Maynooth University,
>> Maynooth, Co Kildare, Ireland
>> Tel: 00 353 7086936
>> Fax: 00 353 1 7086952 
>> 
>>> On 2 Jun 2016, at 16:36, Anders Genell  wrote:
>>> 
>>> Ok, after trying a bit it seems I really cannot get it to work. 
>>> 
>>> The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...
>>> 
>>> Are there versions of neon, so that csound includes support for one but not another?
>>> 
>>> Regards,
>>> Anders 
>>> 
>>>> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini :
>>>> 
>>>> Here are some pointers:
>>>> 
>>>> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
>>>> 
>>>> 2. Open the file. You will see this line:
>>>> 
>>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
>>>> 
>>>> This is where the C compiler flags can be set. Change it to something like
>>>> 
>>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
>>>> 
>>>> then build as usual
>>>> 
>>>> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
>>>> 
>>>> Regards
>>>> ========================
>>>> Dr Victor Lazzarini
>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>> Maynooth University,
>>>> Maynooth, Co Kildare, Ireland
>>>> Tel: 00 353 7086936
>>>> Fax: 00 353 1 7086952 
>>>> 
>>>>> On 31 May 2016, at 20:00, Anders Genell  wrote:
>>>>> 
>>>>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>>>>> 
>>>>> Regards, 
>>>>> Anders
>>>>> 
>>>>>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>>>>>> 
>>>>>> Hm. I'm likely out of my depth here...
>>>>>> The cpu seems neon capable:
>>>>>> 
>>>>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>>>>>> processor       : 0
>>>>>> model name      : ARMv7 Processor rev 2 (v7l)
>>>>>> BogoMIPS        : 1001.88
>>>>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>>>>>> CPU implementer : 0x41
>>>>>> CPU architecture: 7
>>>>>> CPU variant     : 0x3
>>>>>> CPU part        : 0xc08
>>>>>> CPU revision    : 2
>>>>>> 
>>>>>> Hardware        : Allwinner sun4i/sun5i Families
>>>>>> Revision        : 0000
>>>>>> 
>>>>>> How do I make sure the tool chain has neon support?
>>>>>> 
>>>>>> Regards,
>>>>>> Anders
>>>>>> 
>>>>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>>>>>>> 
>>>>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>>>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>>>>>> 
>>>>>>> ========================
>>>>>>> Dr Victor Lazzarini
>>>>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>>>>> Maynooth University,
>>>>>>> Maynooth, Co Kildare, Ireland
>>>>>>> Tel: 00 353 7086936
>>>>>>> Fax: 00 353 1 7086952 
>>>>>>> 
>>>>>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>>>>>>>> 
>>>>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>>>>>> 
>>>>>>>> Regards,
>>>>>>>> Anders
>>>>>>>> 
>>>>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>>>>>>>>> 
>>>>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>>>>>> 
>>>>>>>>> Csound mailing list
>>>>>>>>> Csound@listserv.heanet.ie
>>>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>>>> Send bugs reports to
>>>>>>>>> https://github.com/csound/csound/issues
>>>>>>>>> Discussions of bugs and features can be posted here
>>>>>>>> 
>>>>>>>> Csound mailing list
>>>>>>>> Csound@listserv.heanet.ie
>>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>>> Send bugs reports to
>>>>>>>> https://github.com/csound/csound/issues
>>>>>>>> Discussions of bugs and features can be posted here
>>>>>>> 
>>>>>>> Csound mailing list
>>>>>>> Csound@listserv.heanet.ie
>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>> Send bugs reports to
>>>>>>>  https://github.com/csound/csound/issues
>>>>>>> Discussions of bugs and features can be posted here
>>>>> 
>>>>> Csound mailing list
>>>>> Csound@listserv.heanet.ie
>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>> Send bugs reports to
>>>>>    https://github.com/csound/csound/issues
>>>>> Discussions of bugs and features can be posted here
>>>> 
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Victor, I'm about to start a project with a Pi 3 and would seriously consider

sending you one ; )

On Thu, Jun 2, 2016 at 12:31 PM, Victor Lazzarini <Victor.Lazzarini@nuim.ie> wrote:

Not sure it warrants an issue, but if you feel you'd like to open it, go ahead.

Note that we can't build this because we do not have the hardware or cross-compiler.

Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland

> On 2 Jun 2016, at 18:22, Anders Genell <anders.genell@GMAIL.COM> wrote:
>
> Thanks! I'll try a little more to see what I can find. Maybe I should start a separate thread/ticket to keep this from obfuscating the OP's (solved) issue?
>
> Regards,
> Anders
>
>> 2 juni 2016 kl. 18:02 skrev Victor Lazzarini <Victor.Lazzarini@NUIM.IE>:
>>
>> The neon extensions are defined by an API that I think is common to all hardware that implement it.
>> Did you try just adding -mfpu=neon to see what happens (leaving the other flag)? Also why is ‘hard’ not compiling,
>> what errors are you getting?
>>
>> Otherwise, you will need to try and look it up on the interweb, see for instance
>>
>> https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=98354
>>
>> It looks like it should be definitely possible.
>> ========================
>> Dr Victor Lazzarini
>> Dean of Arts, Celtic Studies and Philosophy,
>> Maynooth University,
>> Maynooth, Co Kildare, Ireland
>> Tel: 00 353 7086936
>> Fax: 00 353 1 7086952
>>
>>> On 2 Jun 2016, at 16:36, Anders Genell <anders.genell@gmail.com> wrote:
>>>
>>> Ok, after trying a bit it seems I really cannot get it to work.
>>>
>>> The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...
>>>
>>> Are there versions of neon, so that csound includes support for one but not another?
>>>
>>> Regards,
>>> Anders
>>>
>>>> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini <Victor.Lazzarini@NUIM.IE>:
>>>>
>>>> Here are some pointers:
>>>>
>>>> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
>>>>
>>>> 2. Open the file. You will see this line:
>>>>
>>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
>>>>
>>>> This is where the C compiler flags can be set. Change it to something like
>>>>
>>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
>>>>
>>>> then build as usual
>>>>
>>>> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
>>>>
>>>> Regards
>>>> ========================
>>>> Dr Victor Lazzarini
>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>> Maynooth University,
>>>> Maynooth, Co Kildare, Ireland
>>>> Tel: 00 353 7086936
>>>> Fax: 00 353 1 7086952
>>>>
>>>>> On 31 May 2016, at 20:00, Anders Genell <anders.genell@gmail.com> wrote:
>>>>>
>>>>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>>>>>
>>>>> Regards,
>>>>> Anders
>>>>>
>>>>>> 31 maj 2016 kl. 20:28 skrev Anders Genell <anders.genell@gmail.com>:
>>>>>>
>>>>>> Hm. I'm likely out of my depth here...
>>>>>> The cpu seems neon capable:
>>>>>>
>>>>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>>>>>> processor       : 0
>>>>>> model name      : ARMv7 Processor rev 2 (v7l)
>>>>>> BogoMIPS        : 1001.88
>>>>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>>>>>> CPU implementer : 0x41
>>>>>> CPU architecture: 7
>>>>>> CPU variant     : 0x3
>>>>>> CPU part        : 0xc08
>>>>>> CPU revision    : 2
>>>>>>
>>>>>> Hardware        : Allwinner sun4i/sun5i Families
>>>>>> Revision        : 0000
>>>>>>
>>>>>> How do I make sure the tool chain has neon support?
>>>>>>
>>>>>> Regards,
>>>>>> Anders
>>>>>>
>>>>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini <Victor.Lazzarini@NUIM.IE>:
>>>>>>>
>>>>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>>>>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>>>>>>>
>>>>>>> ========================
>>>>>>> Dr Victor Lazzarini
>>>>>>> Dean of Arts, Celtic Studies and Philosophy,
>>>>>>> Maynooth University,
>>>>>>> Maynooth, Co Kildare, Ireland
>>>>>>> Tel: 00 353 7086936
>>>>>>> Fax: 00 353 1 7086952
>>>>>>>
>>>>>>>> On 31 May 2016, at 10:06, Anders Genell <anders.genell@gmail.com> wrote:
>>>>>>>>
>>>>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Anders
>>>>>>>>
>>>>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy <ebmtranceboy@GMAIL.COM>:
>>>>>>>>>
>>>>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>>>>>>>>>
>>>>>>>>> Csound mailing list
>>>>>>>>> Csound@listserv.heanet.ie
>>>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>>>> Send bugs reports to
>>>>>>>>> https://github.com/csound/csound/issues
>>>>>>>>> Discussions of bugs and features can be posted here
>>>>>>>>
>>>>>>>> Csound mailing list
>>>>>>>> Csound@listserv.heanet.ie
>>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>>> Send bugs reports to
>>>>>>>> https://github.com/csound/csound/issues
>>>>>>>> Discussions of bugs and features can be posted here
>>>>>>>
>>>>>>> Csound mailing list
>>>>>>> Csound@listserv.heanet.ie
>>>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>>>> Send bugs reports to
>>>>>>>  https://github.com/csound/csound/issues
>>>>>>> Discussions of bugs and features can be posted here
>>>>>
>>>>> Csound mailing list
>>>>> Csound@listserv.heanet.ie
>>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>>> Send bugs reports to
>>>>>    https://github.com/csound/csound/issues
>>>>> Discussions of bugs and features can be posted here
>>>>
>>>> Csound mailing list
>>>> Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>> Send bugs reports to
>>>>     https://github.com/csound/csound/issues
>>>> Discussions of bugs and features can be posted here
>>>
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>      https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>>
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>       https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

With Anders’ help, I was able to confirm the build with NEON support on ARM using the
instructions in https://github.com/csound/csound/blob/develop/BUILD.md (his computer is
not a RPI, but a CHIP, however I think the instructions work for both).

========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 2 Jun 2016, at 20:58, Victor Lazzarini  wrote:
> 
> Thanks; it looks like I might be able to ssh into Anders' one.
> 
> Victor Lazzarini
> Dean of Arts, Celtic Studies, and Philosophy
> Maynooth University
> Ireland
> 
> On 2 Jun 2016, at 20:26, Linda Antas  wrote:
> 
>> Victor, I'm about to start a project with a Pi 3 and would seriously consider
>> sending you one ; )
>> 
>> On Thu, Jun 2, 2016 at 12:31 PM, Victor Lazzarini  wrote:
>> Not sure it warrants an issue, but if you feel you'd like to open it, go ahead.
>> 
>> Note that we can't build this because we do not have the hardware or cross-compiler.
>> 
>> Victor Lazzarini
>> Dean of Arts, Celtic Studies, and Philosophy
>> Maynooth University
>> Ireland
>> 
>> > On 2 Jun 2016, at 18:22, Anders Genell  wrote:
>> >
>> > Thanks! I'll try a little more to see what I can find. Maybe I should start a separate thread/ticket to keep this from obfuscating the OP's (solved) issue?
>> >
>> > Regards,
>> > Anders
>> >
>> >> 2 juni 2016 kl. 18:02 skrev Victor Lazzarini :
>> >>
>> >> The neon extensions are defined by an API that I think is common to all hardware that implement it.
>> >> Did you try just adding -mfpu=neon to see what happens (leaving the other flag)? Also why is ‘hard’ not compiling,
>> >> what errors are you getting?
>> >>
>> >> Otherwise, you will need to try and look it up on the interweb, see for instance
>> >>
>> >> https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=98354
>> >>
>> >> It looks like it should be definitely possible.
>> >> ========================
>> >> Dr Victor Lazzarini
>> >> Dean of Arts, Celtic Studies and Philosophy,
>> >> Maynooth University,
>> >> Maynooth, Co Kildare, Ireland
>> >> Tel: 00 353 7086936
>> >> Fax: 00 353 1 7086952
>> >>
>> >>> On 2 Jun 2016, at 16:36, Anders Genell  wrote:
>> >>>
>> >>> Ok, after trying a bit it seems I really cannot get it to work.
>> >>>
>> >>> The country info says it supports neon, but with mfloat-abi=hard compilation fails, and trying =softfp causes cmake not to find if the cpu is bigendian or not...
>> >>>
>> >>> Are there versions of neon, so that csound includes support for one but not another?
>> >>>
>> >>> Regards,
>> >>> Anders
>> >>>
>> >>>> 1 juni 2016 kl. 09:22 skrev Victor Lazzarini :
>> >>>>
>> >>>> Here are some pointers:
>> >>>>
>> >>>> 1. In the top level directory, there is an example Custom.cmake called Custom.cmake.ex, rename it Custom.cmake.
>> >>>>
>> >>>> 2. Open the file. You will see this line:
>> >>>>
>> >>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W -Wall -mtune=core2”)
>> >>>>
>> >>>> This is where the C compiler flags can be set. Change it to something like
>> >>>>
>> >>>> set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfloat-abi=hard -mfpu=neon”)
>> >>>>
>> >>>> then build as usual
>> >>>>
>> >>>> If it builds OK, then the PFFFT lib will be using NEON. To use this library, add --fftlib=1 to the Csound options.
>> >>>>
>> >>>> Regards
>> >>>> ========================
>> >>>> Dr Victor Lazzarini
>> >>>> Dean of Arts, Celtic Studies and Philosophy,
>> >>>> Maynooth University,
>> >>>> Maynooth, Co Kildare, Ireland
>> >>>> Tel: 00 353 7086936
>> >>>> Fax: 00 353 1 7086952
>> >>>>
>> >>>>> On 31 May 2016, at 20:00, Anders Genell  wrote:
>> >>>>>
>> >>>>> ...and what should custom.cmake look like to enable neon? And where should it be? In my build dir?
>> >>>>>
>> >>>>> Regards,
>> >>>>> Anders
>> >>>>>
>> >>>>>> 31 maj 2016 kl. 20:28 skrev Anders Genell :
>> >>>>>>
>> >>>>>> Hm. I'm likely out of my depth here...
>> >>>>>> The cpu seems neon capable:
>> >>>>>>
>> >>>>>> chip@chip:~/Src/csound/csound6$ cat /proc/cpuinfo
>> >>>>>> processor       : 0
>> >>>>>> model name      : ARMv7 Processor rev 2 (v7l)
>> >>>>>> BogoMIPS        : 1001.88
>> >>>>>> Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
>> >>>>>> CPU implementer : 0x41
>> >>>>>> CPU architecture: 7
>> >>>>>> CPU variant     : 0x3
>> >>>>>> CPU part        : 0xc08
>> >>>>>> CPU revision    : 2
>> >>>>>>
>> >>>>>> Hardware        : Allwinner sun4i/sun5i Families
>> >>>>>> Revision        : 0000
>> >>>>>>
>> >>>>>> How do I make sure the tool chain has neon support?
>> >>>>>>
>> >>>>>> Regards,
>> >>>>>> Anders
>> >>>>>>
>> >>>>>>> 31 maj 2016 kl. 13:29 skrev Victor Lazzarini :
>> >>>>>>>
>> >>>>>>> yes, you can try adding these flags, but to custom.cmake, not CMakeCache.txt,
>> >>>>>>> The toolchain needs to support it, though, but you will know if it doesn’t because it will not compile.
>> >>>>>>>
>> >>>>>>> ========================
>> >>>>>>> Dr Victor Lazzarini
>> >>>>>>> Dean of Arts, Celtic Studies and Philosophy,
>> >>>>>>> Maynooth University,
>> >>>>>>> Maynooth, Co Kildare, Ireland
>> >>>>>>> Tel: 00 353 7086936
>> >>>>>>> Fax: 00 353 1 7086952
>> >>>>>>>
>> >>>>>>>> On 31 May 2016, at 10:06, Anders Genell  wrote:
>> >>>>>>>>
>> >>>>>>>> I just tried to build on a NextThingCo CHIP (ARM R8) and had the same issue. It seems the CHIP should have NEON support - should I then NOT add the flags to CMakeCache.txt, but add -mfloat-abi=hard mfpu=neon to the make command?
>> >>>>>>>>
>> >>>>>>>> Regards,
>> >>>>>>>> Anders
>> >>>>>>>>
>> >>>>>>>>> 26 maj 2016 kl. 14:34 skrev ebmtranceboy :
>> >>>>>>>>>
>> >>>>>>>>> Ok I can compile with -mfloat-abi=hard -mfpu=neon but not with -mfloat-abi=softfp (I added this to BUILD.md).
>> >>>>>>>>>
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>> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

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