iphone - Linking problem in Xcode when using a dependent subproject -


i using xcode write iphone project , use external library. added xcode project file parent target , adjusted header search path , set direct dependency in parent's build target.

now strange thing happens: can open library , compile without problems. library links frameworks e.g. avfoundation.framework.

i clean target , start building parent project. in build results see builds library, linking fails these error messages:

undefined symbols:   "_avcapturesessionpresetmedium", referenced from:       _avcapturesessionpresetmedium$non_lazy_ptr in libzxingwidget.a(zxingwidgetcontroller.o)      (maybe meant: _avcapturesessionpresetmedium$non_lazy_ptr)   "_cvpixelbuffergetheight", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_cvpixelbufferlockbaseaddress", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_audioservicesplaysystemsound", referenced from:       -[zxingwidgetcontroller presentresultforstring:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_audioservicescreatesystemsoundid", referenced from:       -[zxingwidgetcontroller viewwillappear:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_cvpixelbufferunlockbaseaddress", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_cvpixelbuffergetbaseaddress", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_cvpixelbuffergetbytesperrow", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_iconv_close", referenced from:       zxing::qrcode::decodedbitstreamparser::append(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned char const*, unsigned long, char const*)in libzxingwidget.a(decodedbitstreamparser-64e27b33e79cbc52.o)       zxing::qrcode::decodedbitstreamparser::append(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned char const*, unsigned long, char const*)in libzxingwidget.a(decodedbitstreamparser-64e27b33e79cbc52.o)   "_objc_class_$_avcapturevideopreviewlayer", referenced from:       objc-class-ref-to-avcapturevideopreviewlayer in libzxingwidget.a(zxingwidgetcontroller.o)   "_iconv", referenced from:       zxing::qrcode::decodedbitstreamparser::append(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned char const*, unsigned long, char const*)in libzxingwidget.a(decodedbitstreamparser-64e27b33e79cbc52.o)   "_objc_class_$_avcapturesession", referenced from:       objc-class-ref-to-avcapturesession in libzxingwidget.a(zxingwidgetcontroller.o)   "_objc_class_$_avcapturedevice", referenced from:       objc-class-ref-to-avcapturedevice in libzxingwidget.a(zxingwidgetcontroller.o)   "_kcvpixelbufferpixelformattypekey", referenced from:       _kcvpixelbufferpixelformattypekey$non_lazy_ptr in libzxingwidget.a(zxingwidgetcontroller.o)      (maybe meant: _kcvpixelbufferpixelformattypekey$non_lazy_ptr)   "_objc_class_$_avcapturevideodataoutput", referenced from:       objc-class-ref-to-avcapturevideodataoutput in libzxingwidget.a(zxingwidgetcontroller.o)   "_cvpixelbuffergetwidth", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_audioservicesdisposesystemsoundid", referenced from:       -[zxingwidgetcontroller dealloc] in libzxingwidget.a(zxingwidgetcontroller.o)   "_objc_class_$_avcapturedeviceinput", referenced from:       objc-class-ref-to-avcapturedeviceinput in libzxingwidget.a(zxingwidgetcontroller.o)   "_avlayervideogravityresizeaspectfill", referenced from:       _avlayervideogravityresizeaspectfill$non_lazy_ptr in libzxingwidget.a(zxingwidgetcontroller.o)      (maybe meant: _avlayervideogravityresizeaspectfill$non_lazy_ptr)   "_cmsamplebuffergetimagebuffer", referenced from:       -[zxingwidgetcontroller captureoutput:didoutputsamplebuffer:fromconnection:] in libzxingwidget.a(zxingwidgetcontroller.o)   "_iconv_open", referenced from:       zxing::qrcode::decodedbitstreamparser::append(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned char const*, unsigned long, char const*)in libzxingwidget.a(decodedbitstreamparser-64e27b33e79cbc52.o)   "_avmediatypevideo", referenced from:       _avmediatypevideo$non_lazy_ptr in libzxingwidget.a(zxingwidgetcontroller.o)      (maybe meant: _avmediatypevideo$non_lazy_ptr) ld: symbol(s) not found collect2: ld returned 1 exit status

i can include needed frameworks in parent project, thought including frameworks in library project linking ok.

my question is: have include frameworks dependent subprojects use in parent project ensure proper linking, or doing wrong?

thanks help.

if subproject compiles static lib, yes.


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