GNU bug report logs - #62105
[PATCH] gnu: zig: make zig build for a baseline cpu

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ekaitz Zarraga <ekaitz <at> elenq.tech>
Subject: bug#62105: closed (Re: [PATCH v2] gnu: zig: Build against a
 baseline CPU.)
Date: Sun, 19 Mar 2023 08:29:02 +0000

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Your bug report

#62105: [PATCH] gnu: zig: make zig build for a baseline cpu

which was filed against the guix-patches package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 62105 <at> debbugs.gnu.org.

-- 
62105: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62105
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
To: Ekaitz Zarraga <ekaitz <at> elenq.tech>
Cc: 62105-done <at> debbugs.gnu.org
Subject: Re: [PATCH v2] gnu: zig: Build against a baseline CPU.
Date: Sun, 19 Mar 2023 09:28:12 +0100

Am Sonntag, dem 12.03.2023 um 10:01 +0000 schrieb Ekaitz Zarraga:
> Thank you Liliana, and sorry for the inconvenience.
No problem.

Pushed.

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From: Ekaitz Zarraga <ekaitz <at> elenq.tech>
To: "guix-patches <at> gnu.org" <guix-patches <at> gnu.org>
Subject: [PATCH] gnu: zig: make zig build for a baseline cpu
Date: Fri, 10 Mar 2023 22:01:12 +0000

This patch fixes a `Illegal instruction` issue when running Zig.
It happens because Zig compiles with optimizations for the current
machine, which may add instructions that are not compatible with
some target machines. This flag makes it build for a baseline cpu.

Tested with:

qemu-x86_64 -cpu Broadwell-v2 /gnu/store/zzi23y4mab8zl58hdd740xz3814vy24w-zig-0.10.1/bin/zig build

And:
qemu-x86_64 -cpu Broadwell-v4 /gnu/store/zzi23y4mab8zl58hdd740xz3814vy24w-zig-0.10.1/bin/zig build

It worked.
It follows what Arch does:
https://github.com/archlinux/svntogit-community/blob/31055e6750a5672ebbd85114fe7a93163f8af575/trunk/PKGBUILD#L30
And NixOS:
https://github.com/NixOS/nixpkgs/pull/215994/commits/26b9a2f4a1a53e6763aa83590aad0fce5013a458

Hope this helps.
Best,
Ekaitz


---

From 8dbb801ba7df6cc64c003e8f1739117c8dda6a75 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz <at> elenq.tech>
Date: Fri, 10 Mar 2023 22:52:19 +0100
Subject: [PATCH] gnu: zig: make zig build for a baseline cpu

* gnu/packages/zig.scm(zig-0.10): Add -DZIG_TARGET_MCPU=baseline
  configure flag.
---
 gnu/packages/zig.scm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gnu/packages/zig.scm b/gnu/packages/zig.scm
index 5414b5ba6e..2c89343cb1 100644
--- a/gnu/packages/zig.scm
+++ b/gnu/packages/zig.scm
@@ -56,6 +56,7 @@ (define-public zig-0.10
                    '(string-append "-DZIG_TARGET_TRIPLE="
                                    (%current-target-system))
                    '())
+             (string-append "-DZIG_TARGET_MCPU=baseline")
              (string-append "-DZIG_LIB_DIR=" (assoc-ref %outputs "out")
                             "/lib/zig"))
        #:validate-runpath? #f       ; TODO: zig binary can't find ld-linux.
--
2.39.1

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