objective c - Calculating IOS signal strength using CTGetSignalStrength() -


i have begun developing non-apple store app ios 8.3 measures , returns received signal strength indicator (rssi) value in db. got access git repository xcode project named vafieldtest uses core telephony framework in order access information such cell id, serving mnc, rssi, etc. however, build of project fails , returns following error:

    ld /users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/products/debug-iphonesimulator/vafieldtest.app/vafieldtest normal i386     cd /users/rajesh/documents/vafieldtest     export iphoneos_deployment_target=4.0     export path="/applications/xcode-beta.app/contents/developer/platforms/iphonesimulator.platform/developer/usr/bin:/applications/xcode-beta.app/contents/developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"     /applications/xcode-beta.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /applications/xcode-beta.app/contents/developer/platforms/iphonesimulator.platform/developer/sdks/iphonesimulator8.4.sdk -l/users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/products/debug-iphonesimulator -f/users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/products/debug-iphonesimulator -f/applications/xcode-beta.app/contents/developer/platforms/iphonesimulator.platform/developer/sdks/iphonesimulator8.4.sdk/system/library/privateframeworks -filelist /users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/intermediates/vafieldtest.build/debug-iphonesimulator/vafieldtest.build/objects-normal/i386/vafieldtest.linkfilelist -xlinker -objc_abi_version -xlinker 2 -fobjc-link-runtime -xlinker -no_implicit_dylibs -mios-simulator-version-min=4.0 -framework foundation -framework uikit -framework coregraphics -framework coretelephony -weak_framework voiceservices -xlinker -dependency_info -xlinker /users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/intermediates/vafieldtest.build/debug-iphonesimulator/vafieldtest.build/objects-normal/i386/vafieldtest_dependency_info.dat -o /users/rajesh/library/developer/xcode/deriveddata/vafieldtest-dmyrokwehbyuqcauvwpiouivlnqy/build/products/debug-iphonesimulator/vafieldtest.app/vafieldtest  ld: -pie can used when targeting ios 4.2 or later clang: error: linker command failed exit code 1 (use -v see invocation)

at first thought due linking of new library upon inspection, build dependencies have been included , didn't help. thought of calling core telephony methods myself official documentation lists no methods accessing these core functions in ios 8.3. listed methods available @ developers documentation library , don't contain required methods.

how rssi values in ios 8.3? im using xcode 6.4 beta.

this no longer possible, apparently side-effect patching vulnerability. get cellid, lac, ... on ios 8.3


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