> 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. no idea. kuma% clang --version clang version 3.4 (tags/RELEASE_34/final) Target: x86_64--netbsd Thread model: posix kuma% clang -'###' -g a.o clang version 3.4 (tags/RELEASE_34/final) Target: x86_64--netbsd Thread model: posix clang: warning: argument unused during compilation: '-g' "/usr/bin/ld" "--eh-frame-hdr" "-dynamic-linker" "/libexec/ld.elf_so" "-o" "a.out" "/usr/lib/crt0.o" "/usr/lib/crti.o" "/usr/lib/crtbegin.o" "a.o" "-lc" "/usr/lib/crtend.o" "/usr/lib/crtn.o" kuma% YAMAMOTO Takashi _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
