gnu: Add support for x86_64-linux-gnux32.

* gnu/packages/bootstrap.scm (glibc-dynamic-linker): Add entry for
x86_64-linux-gnux32.
* gnu/packages/gcc.scm (gcc-configure-flags-for-triplet): Add
configure-flag for x86_64-linux-gnux32.
* guix/platforms/x86.scm (x86_64-linux-gnux32): New variable.
* guix/utils.scm (gnu-triplet->nix-system): Force x86_64-linux-gnux32 to
output a different nix-system than x86_64-linux-gnu.

Change-Id: I519fea2f8357e4b9895ede05fe8a5e373e9b034a
Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

4 files changed, 21 insertions, 3 deletions

diff --git a/gnu/packages/bootstrap.scm b/gnu/packages/bootstrap.scm
index 602d8f26c5..a36bb289cd 100644
--- a/gnu/packages/bootstrap.scm
+++ b/gnu/packages/bootstrap.scm
@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2018, 2019 Mark H Weaver <mhw@netris.org>
-;;; Copyright © 2017, 2020 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2017, 2020, 2024 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018, 2020, 2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;; Copyright © 2019 Léo Le Bouter <lle-bout@zaclys.net>
@@ -323,6 +323,9 @@ or false to signal an error."
      ((string=? system "powerpc64-linux") "/lib/ld64.so.1")
      ((string=? system "alpha-linux") "/lib/ld-linux.so.2")
 
+     ;; TODO: Differentiate between x86_64-linux-gnu and x86_64-linux-gnux32.
+     ((string=? system "x86_64-linux-gnux32") "/lib/ld-linux-x32.so.2")
+
      ;; XXX: This one is used bare-bones, without a libc, so add a case
      ;; here just so we can keep going.
      ((string=? system "arm-eabi") "no-ld.so")
diff --git a/gnu/packages/gcc.scm b/gnu/packages/gcc.scm
index a8b74a3632..5590cd3d7e 100644
--- a/gnu/packages/gcc.scm
+++ b/gnu/packages/gcc.scm
@@ -3,7 +3,7 @@
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014, 2015, 2016, 2017, 2019, 2021 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015, 2023 Andreas Enge <andreas@enge.fr>
-;;; Copyright © 2015-2018, 2020-2023 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2015-2018, 2020-2024 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2016 Carlos Sánchez de La Lama <csanchezdll@gmail.com>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018, 2020, 2022 Marius Bakke <marius@gnu.org>
@@ -75,6 +75,9 @@ where the OS part is overloaded to denote a specific ABI---into GCC
            "--with-mode=thumb"
            "--with-fpu=neon"))
 
+        ((string-match "x86_64-linux-gnux32" target)
+         '("--with-abi=mx32"))
+
         ((and (string-suffix? "-gnu" target)
               (not (string-contains target "-linux")))
          ;; Cross-compilation of libcilkrts in GCC 5.5.0 to GNU/Hurd fails
diff --git a/guix/platforms/x86.scm b/guix/platforms/x86.scm
index 4ed5638c14..0c8fc7296c 100644
--- a/guix/platforms/x86.scm
+++ b/guix/platforms/x86.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2022 Mathieu Othacehe <othacehe@gnu.org>
+;;; Copyright © 2023, 2024 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,6 +22,7 @@
   #:use-module (guix records)
   #:export (i686-linux
             x86_64-linux
+            x86_64-linux-x32
             i686-mingw
             x86_64-mingw
             i586-gnu))
@@ -41,6 +43,14 @@
    (rust-target "x86_64-unknown-linux-gnu")
    (glibc-dynamic-linker "/lib/ld-linux-x86-64.so.2")))
 
+(define x86_64-linux-x32
+  (platform
+   (target "x86_64-linux-gnux32")
+   (system #f)
+   (linux-architecture "x86_64")
+   (rust-target "x86_64-unknown-linux-gnux32")
+   (glibc-dynamic-linker "/lib/ld-linux-x32.so.2")))
+
 (define i686-mingw
   (platform
    (target "i686-w64-mingw32")
diff --git a/guix/utils.scm b/guix/utils.scm
index 8e71f97e1c..f4bf965e9a 100644
--- a/guix/utils.scm
+++ b/guix/utils.scm
@@ -7,7 +7,7 @@
 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2018, 2020 Marius Bakke <marius@gnu.org>
-;;; Copyright © 2020, 2021 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2020, 2021, 2024 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2020, 2021, 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
 ;;; Copyright © 2021 Chris Marusich <cmmarusich@gmail.com>
@@ -634,6 +634,8 @@ returned by `config.guess'."
                        (else triplet))))
     (cond ((string-match "^arm[^-]*-([^-]+-)?linux-gnueabihf" triplet)
            "armhf-linux")
+          ;; Otherwise it will show up as x86_64-linux... which isn't wrong.
+          ((string-match "x86_64-linux-gnux32" triplet) "x86_64-linux-gnux32")
           ((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet)
            =>
            (lambda (m)