![]() Words, via dlopen or System.loadLibrary), it may not be possible for the Loading libraries dynamically after the executable has been loaded (in other ![]() Symbol and matching type infos are merged when libraries are loaded. When a type does not have a key function, its typeinfo is emitted as a weak If the type_info for the catch matches the thrown exception. Only if their type_info pointers are identical. The C++ ABI states that two objects have the same type if and The first non-pure, out-of-line virtual function for a type. ![]() Solution: Add a key function to your types. Problem: Exceptions are not being caught when thrown across shared library RTTI/exceptions not working across library boundaries Note: ndk-build and CMake handle this for you. The actual symbol here might be anything prefixed with _atomic_. Problem: Some ABIs need libatomic to provide some implementations forĮrror: undefined reference to ' _atomic_exchange_4' UnsatisfiedLinkError: dlopen failed: cannot locate symbol " rand"Īnswer. _aeabi_* _aeabi_memcpy and _aeabi_memclr seem to be the most common. You attempt to load your native libraries. Is one example of possible runtime errors. UnsatisfiedLinkError: dlopen failed: cannot locate symbol " _aeabi_memcpy" Build Systemįor other build systems, see Use the NDK with other build Solution: Set your NDK API level ( APP_PLATFORM) to the minimum version Problem: Your NDK API level is higher than the API supported by your Referred to at all, they must be present. Loaded rather than when they are first called, you cannot reference APIs thatĪre not always present and guard their use with API level checks. Since references to functions are typically resolved when libraries are Note: If you're using externalNativeBuild, it automatically uses your In ndk-build, this is your APP_PLATFORM setting. The API level you build against with the NDK has a very different meaning thanĬompileSdkVersion does for Java. minSdkVersion set higher than device API level Note: Since r16 beta 2, the C library exposes mmap64 as an inline function to True of any function in the C library that has an off_t parameter. Note: mmap is only the most common manifestation of this problem. Value is lower than 21, the C library does not contain an mmap that isĬompatible with _FILE_OFFSET_BITS=64, so the function is unavailable. mmap64 was not available until android-21. Using _FILE_OFFSET_BITS=64 instructs the C library to use mmap64 instead of Warning: implicit declaration of function 'mmap' is invalid in C99 Undeclared or implicit definition of mmapĮrror: use of undeclared identifier 'mmap' Solution: Disable _FILE_OFFSET_BITS=64 or raise your minSdkVersion. Problem: Your build is asking for APIs that do not exist in your This problem is explained in detail in the r16 blog post and in the bionic Therefore, using this feature with old API levels results in fewer Versions of Android very few of the off_t APIs were available as an off64_t ![]() _FILE_OFFSET_BITS=64 option is now supported with unified headers, but on old ![]() You defined it when building your app, it was silently ignored. Prior to unified headers, the NDK did not support _FILE_OFFSET_BITS=64. Using _FILE_OFFSET_BITS=64 with older API levels Might encounter when using the NDK, and their solutions (if available). This document is a partial list of the most commonly encountered non-bugs you ![]()
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