[PR PATCH] nauty: disable native code (illegal instructions)

[tornaria <tornaria@users.noreply.github.com>]

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There is a new pull request by tornaria against master on the void-packages repository

https://github.com/tornaria/void-packages nauty
https://github.com/void-linux/void-packages/pull/35367

nauty: disable native code (illegal instructions)
The package currently shipped in void gives me illegal instructions in a
nehalem cpu.

This commit fixes the issue by disabling native compilation unless a build
option is given; also disable popcnt which, although available on nehalem, is
not available in baseline x86_64.

An easy way to spot the issue is to run something like:
```
$ geng 2
>A geng -d0D1 n=2 e=0-1
Illegal instruction
```

#### Testing the changes
- I tested the changes in this PR: **YES**

I compiled with `./xbps-src build nauty` on a cascade lake cpu, then run `./xbps-src check nauty` on a nehalem cpu. This breaks before the present PR, and works ok after.

I also tested sagemath: previously I was getting a lot of doctest failures which are now fixed.

Cc: @leahneukirchen please merge this before sagemath.

A patch file from https://github.com/void-linux/void-packages/pull/35367.patch is attached

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From 723c1247b98f5c2afe78ae3f57d1e5af812c8d71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gonzalo=20Tornar=C3=ADa?= <tornaria@cmat.edu.uy>
Date: Wed, 2 Feb 2022 21:18:02 -0300
Subject: [PATCH] nauty: disable native code (illegal instructions)

The package currently shipped in void gives me illegal instructions in a
nehalem cpu.

This commit fixes the issue by disabling native compilation unless a build
option is given; also disable popcnt which, although available on nehalem, is
not available in baseline x86_64.
---
 srcpkgs/nauty/template | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/srcpkgs/nauty/template b/srcpkgs/nauty/template
index 57025e400999..11ef99f656fa 100644
--- a/srcpkgs/nauty/template
+++ b/srcpkgs/nauty/template
@@ -1,7 +1,7 @@
 # Template file for 'nauty'
 pkgname=nauty
 version=2.7r3
-revision=1
+revision=2
 wrksrc=${pkgname}${version/./}
 build_style=gnu-configure
 make_install_args="includedir=/usr/include/nauty
@@ -13,6 +13,12 @@ homepage="https://pallini.di.uniroma1.it/"
 distfiles="https://pallini.di.uniroma1.it/nauty${version/./}.tar.gz"
 checksum=4f0665b716a53f7a14ea2ae30059f23d064ce3fe4c12c013404ef6e1ee0b88c2
 
+build_options="native_build"
+
+if [ -z "$build_option_native_build" ]; then
+	configure_args="--enable-generic --disable-popcnt"
+fi
+
 nauty-devel_package() {
 	depends="${sourcepkg}>=${version}_${revision} ${makedepends}"
 	short_desc+=" - development files"