[bug#49416] [PATCH core-updates] build-system/gnu: Re-introduce %build-inputs.

[Maxime Devos]

%build-inputs was not defined anymore when cross-compiling.
This causes some build failures on core-updates, see e.g.
<https://ci.guix.gnu.org/build/653883/log/raw>;.  According
to civodul on IRC, this removal of %build-inputs was
accidental, so re-introduce it.

This allows "guix build grep --target=aarch64-linux-gnu" to
succeed on a x86_64-linux machine.  The resulting binary
is executable under qemu-aarch64.

From 97923752ae25b5fe9d48d43fd2d4a4eab03f8a90 Mon Sep 17 00:00:00 2001
From: Maxime Devos <maximedevos@telenet.be>
Date: Mon, 5 Jul 2021 15:17:53 +0200
Subject: [PATCH core-updates] build-system/gnu: Re-introduce %build-inputs.

%build-inputs was not defined anymore when cross-compiling.
This causes some build failures on core-updates, see e.g.
<https://ci.guix.gnu.org/build/653883/log/raw>.  According
to civodul on IRC, this removal of %build-inputs was
accidental, so re-introduce it.

This allows "guix build grep --target=aarch64-linux-gnu" to
succeed on a x86_64-linux machine.  The resulting binary
is executable under qemu-aarch64.

* guix/build-system/gnu.scm
  (gnu-cross-build)[builder]: Define '%build-inputs', again.
---
 guix/build-system/gnu.scm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/guix/build-system/gnu.scm b/guix/build-system/gnu.scm
index c74acb51b0..3af848034f 100644
--- a/guix/build-system/gnu.scm
+++ b/guix/build-system/gnu.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 
Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -516,6 +517,9 @@ platform."
           (append #$(input-tuples->gexp host-inputs)
                   #+(input-tuples->gexp target-inputs)))
 
+        (define %build-inputs
+          (append %build-host-inputs %build-target-inputs))
+
         (define %outputs
           #$(outputs->gexp outputs))
 
-- 
2.32.0

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