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lib/systems: fix uname.processor for powerpc{32,64}, mips64

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Cross-compilation of anything downstream of gtk3 requires qemu (due to
gobject-introspection) with --target-list=*-linux-user.  Without this commit,
those qemu builds will fail on a powerpc64le host due to qemu being configured
with --cpu=powerpc64le instead of --cpu=ppc64le.  Unfortunately the build
failure message from qemu in this situation is extremely cryptic.

The root cause turns out not to be the qemu expression, but rather the fact that
on powerpc64le hostPlatform.uname.processor returns the gnu-name (powerpc64le)
for the cpu instead of the linux-name (ppc64le) for the cpu.

uname.processor on mips64el also needs adjustment -- the Linux-name is "mips64"
for both big and little endian (unlike powerpc64, where the Linux-name includes
a "le" suffix):

```
nix@oak:/tmp$ uname -m; lscpu | head -n2
mips64
Architecture:        mips64
Byte Order:          Little Endian
```

uname.processor on powerpc32 has also been adjusted.
This commit is contained in:
Adam Joseph 2022-09-05 22:02:30 -07:00
parent 727e84a1ca
commit de88969f12
1 changed files with 9 additions and 7 deletions
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16
lib/systems/default.nix
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@ -101,7 +101,14 @@ rec {
}.${final.parsed.kernel.name} or null;
# uname -m
processor = final.parsed.cpu.name;
processor =
if final.isPower64
then "ppc64${lib.optionalString final.isLittleEndian "le"}"
else if final.isPower
then "ppc${lib.optionalString final.isLittleEndian "le"}"
else if final.isMips64
then "mips64" # endianness is *not* included on mips64
else final.parsed.cpu.name;
# uname -r
release = null;
@ -135,12 +142,7 @@ rec {
if final.isAarch32 then "arm"
else if final.isx86_64 then "x86_64"
else if final.isx86 then "i386"
else {
powerpc = "ppc";
powerpcle = "ppc";
powerpc64 = "ppc64";
powerpc64le = "ppc64le";
}.${final.parsed.cpu.name} or final.parsed.cpu.name;
else final.uname.processor;
# Name used by UEFI for architectures.
efiArch =