From ed18ad510192c7aa2b1ab66f0d2e67f6bdcbc531 Mon Sep 17 00:00:00 2001
From: Johannes Schmidt <johannes.schmidt@icinga.com>
Date: Thu, 26 Feb 2026 11:45:06 +0100
Subject: [PATCH] Disable -Wregister for amazonlinux:2 in CI

amazonlinux:2 has a really old GNU bison version (3.0.4), which emits
`register` storage specifiers in its generated C code, which any standard
starting with C99 doesn't allow anymore.
---
 .github/workflows/linux.bash | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/linux.bash b/.github/workflows/linux.bash
index 9cf3d1135..20bd7a653 100755
--- a/.github/workflows/linux.bash
+++ b/.github/workflows/linux.bash
@@ -13,6 +13,12 @@ SCL_ENABLE_GCC=()
 WARN_FLAGS="-Wall -Wextra -Wno-template-id-cdtor -Wno-stringop-overflow"
 
 case "$DISTRO" in
+  amazonlinux:2)
+    # amazonlinux:2 has a really old GNU bison (3.0.4), which still emits register storage
+    # specifiers, that even the only slightly more modern compiler warns that C++17 does not
+    # allow (duh).
+    WARN_FLAGS="${WARN_FLAGS} -Wno-register"
+    ;;
   debian:11)
     # -Wattributes neededs to be disabled to not get warnings in old compilers about not-yet
     # understood attributes, like [[gnu::no_dangling]] on debian:11.