From 4c0dfd5959bd499754e3fc9a7ce37c1d5ece31f7 Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Fri, 17 May 2024 16:47:22 +0100
Subject: [PATCH] arm: fail early on gcc builds

Since at least 2022 (see https://reviews.freebsd.org/D36754), it has
not been possible to build armv6/armv7 with gcc due to atomics macros
gcc doesn't like.  Prevent developers doing due diligance from wasting
time and CPU cycles on this combination as it just fails to build in
libc.

Reviewed by:	imp, andrew
Differential Revision:	https://reviews.freebsd.org/D45193
---
 Makefile.inc1 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Makefile.inc1 b/Makefile.inc1
index 0728df1221a0..1bf4212b1d5e 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -172,6 +172,13 @@ LIBCOMPAT_INCLUDE_DIRS+= i386
 LIBCOMPAT_INCLUDE_DIRS+= arm
 .endif
 
+.if ((defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == "gcc") || \
+     (!defined(X_COMPILER_TYPE) && ${COMPILER_TYPE} == "gcc"))
+.if ${TARGET} == "arm"
+.error "armv6/armv7 build are broken with gcc. See https://reviews.freebsd.org/D36754"
+.endif
+.endif
+
 .if ${.MAKE.OS} != "FreeBSD"
 CROSSBUILD_HOST=${.MAKE.OS}
 .if ${.MAKE.OS} != "Linux" && ${.MAKE.OS} != "Darwin"