Re: Patch adding POWER9 cross compile support

[Tobias Platen <trisquel@platen-software.de>]

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I ran configure on my Talos II, and got the following error message.

checking for the Guix system type... powerpc64le-linux
configure: error: `powerpc64le-linux' is not a supported platform.
See "GNU Distribution" in the manual, or try `--with-courage'.

Guix already knows about this architecture, but building glibc will fail 
if gcc does not have the float128 datatype. Once I saw this link[1] on 
the guix mailing list, I knew how to solve the build error.

For the second question I could not find an answer.

[1] http://lists.busybox.net/pipermail/buildroot/2017-September/201379.html

Tobias

On 03/10/2019 06:27 PM, Ludovic Courtès wrote:
> Hi Tobias,
> 
> Tobias Platen <trisquel@platen-software.de> skribis:
> 
>> On 03/06/2019 02:54 PM, Ludovic Courtès wrote:
>>> +                               ,@(if (string-prefix? "powerpc9-" target)
>>> +                                     ;; On POWER9 we need this because XXX.
>>> +                                     '("--with-long-double-128")
>>> +                                     '())
>>> +
>> It needs to be ppc64el I think. I will later do a test in a big endian
>> vm. POWER9 is a bi-endian architecture, and most distros only support
>> little-endian. POWER4 only supports big-endian, and is still supported
>> by some distros. After testing I will send an updated patch.
> 
> I don’t think that answers my questions.  :-)
> 
> Those were:
> 
>    1. What GNU triplet do you use?

> 
>    2. What the reason for this extra configure flag, so we can add it in
>       the comment above in place of XXX?
> 
> TIA!
> 
> Ludo’.
> 

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diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 6a09272..0992259 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -138,6 +138,10 @@ base compiler and using LIBC (which may be either a libc package or #f.)"
                                "--disable-libquadmath"
                                "--disable-decimal-float" ;would need libc
                                "--disable-libcilkrts"
+                               ,@(if (string-prefix? "powerpc64le-" target)
+                               ;; On POWER9 (little endian) glibc needs the 128 bit long double type.
+                               '("--with-long-double-128")
+                               '())
 
                                ;; When target is any OS other than 'none' these
                                ;; libraries will fail if there is no libc