On Mon, 2014-03-24 at 20:47 +0100, Dimitry Andric wrote:
> On 24 Mar 2014, at 20:36, Warner Losh <i...@bsdimp.com> wrote:
> > On Mar 24, 2014, at 1:21 PM, Dimitry Andric <d...@freebsd.org> wrote:
> >> Author: dim
> >> Date: Mon Mar 24 19:21:14 2014
> >> New Revision: 263692
> >> URL: http://svnweb.freebsd.org/changeset/base/263692
> >>
> >> Log:
> >> Add a note to UPDATING about customized kernel configuration files now
> >> requiring -gdwarf-2 for debug info, when using clang 3.4.
> >
> > Makes we wonder why we didn’t put this in kmod.mk… Is there any reason not
> > do?
>
> For modules, you can just DEBUG_FLAGS, like for world. But there is no
> default value of DEBUG_FLAGS in kmod.mk, at least I don't see any.
>
> -Dimitry
>
I guessing he meant kern.mk so that it would be in effect for both
kernel and modules build. Something like this (which I've tested only
for building an arm kernel without modules so far)...
-- Ian
Index: sys/conf/kern.mk
===================================================================
--- sys/conf/kern.mk (revision 263112)
+++ sys/conf/kern.mk (working copy)
@@ -162,3 +162,7 @@ CFLAGS+= -ffreestanding
${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
CFLAGS+= -fstack-protector
.endif
+
+.if ${COMPILER_TYPE} == "clang" && !empty(CFLAGS:M-g*) && empty(CFLAGS:M-gdwarf*)
+CFLAGS+= -gdwarf-2
+.endif
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