[PATCH] Makefile: Avoid non-portable GNU sed extension

[Mark Kettenis]

> Date: Thu, 5 May 2022 16:55:24 +0200
> From: Heinrich Schuchardt <xypron.glpk at gmx.de>
> 
> On 5/5/22 16:42, Mark Kettenis wrote:
> > Use [:space:] instead of \s and \S in regular expression that
> > determines the sandbox target architecture.  Fixes the build
> > failure on OpenBSD introduced with commit 4e65ca00f3a3
> > ("efi_loader: bootmgr: add booting from removable media").
> >
> > Fixes: f7691a6d73 ("sandbox: allow cross-compiling sandbox")
> nits, use 12 first digits of hash
> 
> Fixes: f7691a6d736b ("sandbox: allow cross-compiling sandbox")

Hmm, checkpatch didn't catch that one.  Is this something I should
do a resubmit for?

> > Signed-off-by: Mark Kettenis <kettenis at openbsd.org>
> 
> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> 
> > ---
> >   Makefile | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index ea80f00716..6eceeb35b4 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/^\s*\([^\/]*\/\)*\([^-]*\)-\S*/\2/p'}"
> > +  MK_ARCH="${shell echo $(CROSS_COMPILE) | sed -n 's/^[[:space:]]*\([^\/]*\/\)*\([^-]*\)-[^[:space:]]*/\2/p'}"
> >   endif
> >   unexport HOST_ARCH
> >   ifeq ("x86_64", $(MK_ARCH))
> 
>