Details
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Bug
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Resolution: Done
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P2: Important
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5.12.0
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None
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Android
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74e04d6ace7aa949db97ae2e46c38a4dc0d4d36a (qt/qtbase/5.12)
Description
When building Qt for Android with clang and NDK 18 for ARMv7 libunwind has to be added to exclude-libs. Here is a discussion in issue thread on NDK GitHub:
https://github.com/android-ndk/ndk/issues/889
When building with CMake it is set properly by CMake toolchain file provided by NDK:
# STL specific flags. set(ANDROID_STL_PATH "${ANDROID_NDK}/sources/cxx-stl/llvm-libc++") if(ANDROID_STL STREQUAL system) set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "${ANDROID_NDK}/sources/cxx-stl/system/include") elseif(ANDROID_STL MATCHES "^c\\+\\+_") if(ANDROID_ABI MATCHES "^armeabi") list(APPEND ANDROID_LINKER_FLAGS -Wl,--exclude-libs,libunwind.a) endif() list(APPEND ANDROID_COMPILER_FLAGS_CXX -std=c++11) # Add the libc++ lib directory to the path so the linker scripts can pick up # the extra libraries. list(APPEND ANDROID_LINKER_FLAGS "-L${ANDROID_STL_PATH}/libs/${ANDROID_ABI}") set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "${ANDROID_STL_PATH}/include") if(ANDROID_PLATFORM_LEVEL LESS 21) set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "${CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES}" "${ANDROID_NDK}/sources/android/support/include") endif() set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "${CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES}" "${ANDROID_STL_PATH}abi/include") endif()
This is not reflected in qtbase/mkspecs/android-clang/qmake.conf.
This is important when dealing with exceptions as without that application crashes when exception is caught as it gets symbols from wrong libraries.