From 34b23f597ec52efb795d72e9e5620712d0010edd Mon Sep 17 00:00:00 2001
From: Carl Dong <contact@carldong.me>
Date: Mon, 23 Nov 2020 14:58:33 -0500
Subject: guix: Set ZERO_AR_DATE for darwin build determinism

See comments inserted in this commit.
---
 contrib/guix/libexec/build.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'contrib')

diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 77411377e5..39d3cb9b50 100644
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -148,6 +148,16 @@ export QT_RCC_TEST=1
 export QT_RCC_SOURCE_DATE_OVERRIDE=1
 export TAR_OPTIONS="--owner=0 --group=0 --numeric-owner --mtime='@${SOURCE_DATE_EPOCH}' --sort=name"
 export TZ="UTC"
+case "$HOST" in
+    *darwin*)
+        # cctools AR, unlike GNU binutils AR, does not have a deterministic mode
+        # or a configure flag to enable determinism by default, it only
+        # understands if this env-var is set or not. See:
+        #
+        # https://github.com/tpoechtrager/cctools-port/blob/55562e4073dea0fbfd0b20e0bf69ffe6390c7f97/cctools/ar/archive.c#L334
+        export ZERO_AR_DATE=yes
+        ;;
+esac
 
 ####################
 # Depends Building #
-- 
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