From: Mark Kettenis <kettenis@openbsd.org>
Date: Tue, 26 Nov 2024 19:12:14 +0000 (+0100)
Subject: Makefile: avoid non-standard sed expressions
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Makefile: avoid non-standard sed expressions

The '?' that is used in the sed expression that determines MK_ARCH
is part of the extended regular expression syntax, but the default
behaviour of sed as specified by POSIX is to use only basic regular
expression syntax.  Use the equivalent '\{0,1\}' instead as
suggested by the OpenBSD re_format(7) man page.

Fixes: 04b1d84221d5 ("Makefile: fix empty MK_ARCH when using ccache")
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-by: Quentin Schulz <quentin.schulz@cherry.de>
---

diff --git a/Makefile b/Makefile
index 22953bdabd..7933ade6ef 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ include include/host_arch.h
 ifeq ("", "$(CROSS_COMPILE)")
   MK_ARCH="${shell uname -m}"
 else
-  MK_ARCH="${shell echo $(CROSS_COMPILE) | sed -n 's/^\(ccache\)\?[[:space:]]*\([^\/]*\/\)*\([^-]*\)-[^[:space:]]*/\3/p'}"
+  MK_ARCH="${shell echo $(CROSS_COMPILE) | sed -n 's/^\(ccache\)\{0,1\}[[:space:]]*\([^\/]*\/\)*\([^-]*\)-[^[:space:]]*/\3/p'}"
 endif
 unexport HOST_ARCH
 ifeq ("x86_64", $(MK_ARCH))