[PATCH] contrib: Allow overriding download_prerequisites base URL

From 546ba30b01393797aca3a38c615d62c2fcf8a290 Mon Sep 17 00:00:00 2001
From: Daniil-Gusev <[email protected]>
Date: Sat, 1 Aug 2026 14:16:26 +0300
Subject: [PATCH] contrib: Allow overriding download_prerequisites base URL

Add support for GCC_PREREQUISITES_BASE_URL, so packages can be
fetched from a local mirror instead of gcc.gnu.org every time.

contrib/ChangeLog:

	* download_prerequisites (base_url): Allow overriding via the
	GCC_PREREQUISITES_BASE_URL environment variable.  Document it
	in --help output.
---
 contrib/download_prerequisites | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/contrib/download_prerequisites b/contrib/download_prerequisites
index 2e6693a2aa6..582ff8daa81 100755
--- a/contrib/download_prerequisites
+++ b/contrib/download_prerequisites
@@ -33,7 +33,7 @@ mpc='mpc-1.3.1.tar.gz'
 isl='isl-0.24.tar.bz2'
 gettext='gettext-1.0.tar.gz'
 
-base_url='https://gcc.gnu.org/pub/gcc/infrastructure/'
+base_url="${GCC_PREREQUISITES_BASE_URL:-https://gcc.gnu.org/pub/gcc/infrastructure/}"
 
 echo_archives() {
     echo "${gettext}"
@@ -86,6 +86,11 @@ The following options are available:
  --only-gettext   inhibit downloading any package but gettext
  --help           show this text and exit
  --version        show version information and exit
+
+Environment variables:
+
+ GCC_PREREQUISITES_BASE_URL  override the URL prefix packages are downloaded
+  from; must include a trailing slash
 "
 
 versiontext="${program} ${version}
-- 
2.55.0