Date: Mon, 20 Sep 2010 13:55:58 +0000 From: David Xu <davidxu@freebsd.org> To: David Xu <davidxu@freebsd.org>, freebsd-arch@freebsd.org, Marcel Moolenaar <xcllnt@mac.com>, Bruce Evans <brde@optusnet.com.au> Subject: Re: Per-source CFLAGS again Message-ID: <4C9767EE.3000802@freebsd.org> In-Reply-To: <20100920024542.GA25717@zim.MIT.EDU> References: <4C972E83.7090603@freebsd.org> <20100920024542.GA25717@zim.MIT.EDU>
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David Schultz wrote:
> The reason I proposed the feature was so that we could compile the
> parts of libc that come from a third party (namely, gdtoa) with
> different warning flags than the rest of libc. It was not
> committed because someone else proposed a simpler way to get make
> to use different flags for gdtoa.
>
> I suppose it wouldn't hurt to commit it it's needed for something
> else, but I think Marcel also had some philosophical objections to
> the proposal.
This time, the compiler's function is required to generate some
stack unwinding info, it is not compiler's warning flag.
without modification to sys.mk:
I have to hack the libc's Makefile, but obviously, CWARNFLAGS is not
the right place.
Index: Makefile
===================================================================
--- Makefile
+++ Makefile
@@ -145,3 +145,5 @@
SSP_CFLAGS:= ${SSP_CFLAGS:S/^-fstack-protector-all$/-fstack-protector/}
# Disable stack protection for SSP symbols.
SSP_CFLAGS:= ${.IMPSRC:N*/stack_protector.c:C/^.+$/${SSP_CFLAGS}/}
+# Generate stack unwinding table for cancellation points
+CWARNFLAGS:=
${.IMPSRC:Ncancelpoints_*:C/^.+$/${CWARNFLAGS}/:C/^$/-fexceptions
${CWARNFLAGS}/}
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