On Thu, May 15, 2014 at 04:13:55AM +0900, YAMAMOTO Takashi wrote: > > On Tue, May 13, 2014 at 10:36:30AM +0900, YAMAMOTO Takashi wrote: > >> > On Sat, May 10, 2014 at 08:17:16AM -0700, Ben Pfaff wrote: > >> >> On Sat, May 10, 2014 at 02:17:26PM +0900, YAMAMOTO Takashi wrote: > >> >> > btw, --enable-Werror CC=clang doesn't work. > >> >> > (clang complains about -g for linking) > >> >> > is it only for me? a workaround is LDFLAGS=-Qunused-argument. > >> > > >> > Thinking about it a bit further, I am a little surprised that we are > >> > passing -Werror as part of flags for linking. I think that we only add > >> > -Werror to CFLAGS, so it should not appear when linking. Are we doing > >> > something wrong there? > >> > >> my undestanding is: > >> - AC_PROG_CC considers clang as gcc and sets CFLAGS=-g -O2. > >> - --enable-Werror ends up to add -Werror to CFLAGS. > >> (thus CFLAGS=-g -O2 -Werror) > >> - automake generates the following for linking on my environment. > >> LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \ > >> $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \ > >> $(AM_LDFLAGS) $(LDFLAGS) -o $@ > >> - clang complains "clang: error: argument unused during compilation: '-g'" > > > > OK. I see you're right. So every project that uses Autoconf and > > Automake generates such a warning (or error, with -Werror), with every > > link step, on your system when building with clang? I do not see one > > while i haven't tried other autoconf/automake using programs, > google'ing told me that it isn't so rare symptom. > > > here. I wonder what is different about your clang and mine.
OK. I'm happy enough with a patch that adds -Qunused-argument, in cases where the compiler accepts it. (If we can figure out the root cause, and fix that, then that is better, but I do not know what the root cause is.) _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
