On Thu, Jun 28, 2012 at 9:36 PM, Sean McBride <s...@rogue-research.com> wrote: > On Wed, 27 Jun 2012 20:39:52 +0200, Ludovic Rousseau said: >>> We're specifying gnu99 in AM_CFLAGS, so I wouldn't expect it to end up >>> in LD_FLAGS. This is benign, so I'm not sure it's worth spending time on >>> fixing that. >> >>clang is complaining, during _compilation_, that it can't use '-std=gnu99'. >>This has nothing to do with LD_FLAGS or link. > > Are you sure? What are you basing that assertion on? -std=gnu99 is > a valid compiler flag, so it doesn't make sense that it would ignore it. > I think clang's error message "argument unused during compilation" > is misleading us. If you build with verbose on, I think you'll find it's > the linking invocation that's causing this message.
You are right. The error message is misleading and indeed the linking invocation causes this message. mymacmini:build xiaofanc$ make make all-recursive Making all in libusb /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-core.lo -MD -MP -MF .deps/libusb_1_0_la-core.Tpo -c -o libusb_1_0_la-core.lo `test -f 'core.c' || echo '../../libusbx/libusb/'`core.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-core.lo -MD -MP -MF .deps/libusb_1_0_la-core.Tpo -c ../../libusbx/libusb/core.c -fno-common -DPIC -o .libs/libusb_1_0_la-core.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-core.lo -MD -MP -MF .deps/libusb_1_0_la-core.Tpo -c ../../libusbx/libusb/core.c -o libusb_1_0_la-core.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-core.Tpo .deps/libusb_1_0_la-core.Plo /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-descriptor.lo -MD -MP -MF .deps/libusb_1_0_la-descriptor.Tpo -c -o libusb_1_0_la-descriptor.lo `test -f 'descriptor.c' || echo '../../libusbx/libusb/'`descriptor.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-descriptor.lo -MD -MP -MF .deps/libusb_1_0_la-descriptor.Tpo -c ../../libusbx/libusb/descriptor.c -fno-common -DPIC -o .libs/libusb_1_0_la-descriptor.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-descriptor.lo -MD -MP -MF .deps/libusb_1_0_la-descriptor.Tpo -c ../../libusbx/libusb/descriptor.c -o libusb_1_0_la-descriptor.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-descriptor.Tpo .deps/libusb_1_0_la-descriptor.Plo /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-io.lo -MD -MP -MF .deps/libusb_1_0_la-io.Tpo -c -o libusb_1_0_la-io.lo `test -f 'io.c' || echo '../../libusbx/libusb/'`io.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-io.lo -MD -MP -MF .deps/libusb_1_0_la-io.Tpo -c ../../libusbx/libusb/io.c -fno-common -DPIC -o .libs/libusb_1_0_la-io.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-io.lo -MD -MP -MF .deps/libusb_1_0_la-io.Tpo -c ../../libusbx/libusb/io.c -o libusb_1_0_la-io.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-io.Tpo .deps/libusb_1_0_la-io.Plo /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-sync.lo -MD -MP -MF .deps/libusb_1_0_la-sync.Tpo -c -o libusb_1_0_la-sync.lo `test -f 'sync.c' || echo '../../libusbx/libusb/'`sync.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-sync.lo -MD -MP -MF .deps/libusb_1_0_la-sync.Tpo -c ../../libusbx/libusb/sync.c -fno-common -DPIC -o .libs/libusb_1_0_la-sync.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-sync.lo -MD -MP -MF .deps/libusb_1_0_la-sync.Tpo -c ../../libusbx/libusb/sync.c -o libusb_1_0_la-sync.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-sync.Tpo .deps/libusb_1_0_la-sync.Plo /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-darwin_usb.lo -MD -MP -MF .deps/libusb_1_0_la-darwin_usb.Tpo -c -o libusb_1_0_la-darwin_usb.lo `test -f 'os/darwin_usb.c' || echo '../../libusbx/libusb/'`os/darwin_usb.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-darwin_usb.lo -MD -MP -MF .deps/libusb_1_0_la-darwin_usb.Tpo -c ../../libusbx/libusb/os/darwin_usb.c -fno-common -DPIC -o .libs/libusb_1_0_la-darwin_usb.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-darwin_usb.lo -MD -MP -MF .deps/libusb_1_0_la-darwin_usb.Tpo -c ../../libusbx/libusb/os/darwin_usb.c -o libusb_1_0_la-darwin_usb.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-darwin_usb.Tpo .deps/libusb_1_0_la-darwin_usb.Plo /bin/sh ../libtool --tag=CC --mode=compile clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-threads_posix.lo -MD -MP -MF .deps/libusb_1_0_la-threads_posix.Tpo -c -o libusb_1_0_la-threads_posix.lo `test -f 'os/threads_posix.c' || echo '../../libusbx/libusb/'`os/threads_posix.c libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-threads_posix.lo -MD -MP -MF .deps/libusb_1_0_la-threads_posix.Tpo -c ../../libusbx/libusb/os/threads_posix.c -fno-common -DPIC -o .libs/libusb_1_0_la-threads_posix.o libtool: compile: clang -DHAVE_CONFIG_H -I. -I../../libusbx/libusb -I.. -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT libusb_1_0_la-threads_posix.lo -MD -MP -MF .deps/libusb_1_0_la-threads_posix.Tpo -c ../../libusbx/libusb/os/threads_posix.c -o libusb_1_0_la-threads_posix.o >/dev/null 2>&1 mv -f .deps/libusb_1_0_la-threads_posix.Tpo .deps/libusb_1_0_la-threads_posix.Plo /bin/sh ../libtool --tag=CC --mode=link clang -fvisibility=hidden -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -version-info 1:0:1 -no-undefined -Wl,-prebind -o libusb-1.0.la -rpath /usr/local/Cellar/libusb/HEAD/lib libusb_1_0_la-core.lo libusb_1_0_la-descriptor.lo libusb_1_0_la-io.lo libusb_1_0_la-sync.lo libusb_1_0_la-darwin_usb.lo libusb_1_0_la-threads_posix.lo -lobjc -Wl,-framework,IOKit -Wl,-framework,CoreFoundation libtool: link: clang -dynamiclib -o .libs/libusb-1.0.0.dylib .libs/libusb_1_0_la-core.o .libs/libusb_1_0_la-descriptor.o .libs/libusb_1_0_la-io.o .libs/libusb_1_0_la-sync.o .libs/libusb_1_0_la-darwin_usb.o .libs/libusb_1_0_la-threads_posix.o -lobjc -O2 -Wl,-prebind -Wl,-framework -Wl,IOKit -Wl,-framework -Wl,CoreFoundation -install_name /usr/local/Cellar/libusb/HEAD/lib/libusb-1.0.0.dylib -compatibility_version 2 -current_version 2.0 -Wl,-single_module libtool: link: (cd ".libs" && rm -f "libusb-1.0.dylib" && ln -s "libusb-1.0.0.dylib" "libusb-1.0.dylib") libtool: link: ar cru .libs/libusb-1.0.a libusb_1_0_la-core.o libusb_1_0_la-descriptor.o libusb_1_0_la-io.o libusb_1_0_la-sync.o libusb_1_0_la-darwin_usb.o libusb_1_0_la-threads_posix.o libtool: link: ranlib .libs/libusb-1.0.a libtool: link: ( cd ".libs" && rm -f "libusb-1.0.la" && ln -s "../libusb-1.0.la" "libusb-1.0.la" ) Making all in doc make[2]: Nothing to be done for `all'. Making all in examples clang -DHAVE_CONFIG_H -I. -I../../libusbx/examples -I.. -I../../libusbx/libusb -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT listdevs.o -MD -MP -MF .deps/listdevs.Tpo -c -o listdevs.o ../../libusbx/examples/listdevs.c mv -f .deps/listdevs.Tpo .deps/listdevs.Po /bin/sh ../libtool --tag=CC --mode=link clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o listdevs listdevs.o ../libusb/libusb-1.0.la -lobjc -Wl,-framework,IOKit -Wl,-framework,CoreFoundation libtool: link: clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o .libs/listdevs listdevs.o -Wl,-framework -Wl,IOKit -Wl,-framework -Wl,CoreFoundation ../libusb/.libs/libusb-1.0.dylib -lobjc clang: warning: argument unused during compilation: '-std=gnu99' clang -DHAVE_CONFIG_H -I. -I../../libusbx/examples -I.. -I../../libusbx/libusb -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT xusb.o -MD -MP -MF .deps/xusb.Tpo -c -o xusb.o ../../libusbx/examples/xusb.c mv -f .deps/xusb.Tpo .deps/xusb.Po /bin/sh ../libtool --tag=CC --mode=link clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o xusb xusb.o ../libusb/libusb-1.0.la -lobjc -Wl,-framework,IOKit -Wl,-framework,CoreFoundation libtool: link: clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o .libs/xusb xusb.o -Wl,-framework -Wl,IOKit -Wl,-framework -Wl,CoreFoundation ../libusb/.libs/libusb-1.0.dylib -lobjc clang: warning: argument unused during compilation: '-std=gnu99' clang -DHAVE_CONFIG_H -I. -I../../libusbx/examples -I.. -I../../libusbx/libusb -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT dpfp.o -MD -MP -MF .deps/dpfp.Tpo -c -o dpfp.o ../../libusbx/examples/dpfp.c mv -f .deps/dpfp.Tpo .deps/dpfp.Po /bin/sh ../libtool --tag=CC --mode=link clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o dpfp dpfp.o ../libusb/libusb-1.0.la -lobjc -Wl,-framework,IOKit -Wl,-framework,CoreFoundation libtool: link: clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o .libs/dpfp dpfp.o -Wl,-framework -Wl,IOKit -Wl,-framework -Wl,CoreFoundation ../libusb/.libs/libusb-1.0.dylib -lobjc clang: warning: argument unused during compilation: '-std=gnu99' clang -DHAVE_CONFIG_H -I. -I../../libusbx/examples -I.. -I../../libusbx/libusb -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -MT dpfp_threaded-dpfp_threaded.o -MD -MP -MF .deps/dpfp_threaded-dpfp_threaded.Tpo -c -o dpfp_threaded-dpfp_threaded.o `test -f 'dpfp_threaded.c' || echo '../../libusbx/examples/'`dpfp_threaded.c mv -f .deps/dpfp_threaded-dpfp_threaded.Tpo .deps/dpfp_threaded-dpfp_threaded.Po /bin/sh ../libtool --tag=CC --mode=link clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o dpfp_threaded dpfp_threaded-dpfp_threaded.o ../libusb/libusb-1.0.la -lobjc -Wl,-framework,IOKit -Wl,-framework,CoreFoundation libtool: link: clang -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -g -O2 -o .libs/dpfp_threaded dpfp_threaded-dpfp_threaded.o -Wl,-framework -Wl,IOKit -Wl,-framework -Wl,CoreFoundation ../libusb/.libs/libusb-1.0.dylib -lobjc clang: warning: argument unused during compilation: '-std=gnu99' make[2]: Nothing to be done for `all-am'. -- Xiaofan ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. 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