If you don't need the code coverage, you can complete disable it by using the following settings, thus avoiding the attempted calls to those functions.
GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = NO
GCC_GENERATE_TEST_COVERAGE_FILES = NO
http://stackoverflow.com/questions/7949781/undefined-symbols-for-architecture-i386-upgrading-project-to-ios-5
本文指导如何在不使用代码覆盖率的情况下优化项目移植至iOS 5的过程,通过设置GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=NO和GCC_GENERATE_TEST_COVERAGE_FILES=NO避免不必要的函数调用。
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