My code crashes here:
void setText(const string & s)
{
needsReload = true;
_text = s; //<-- SIGSEGV here
}
_text is a std::string
This makes absolutely no sense. this, _text and s are in valid memory. I can’t try portstl because I need exceptions. There is simply nothing that can go wrong. I’m currently compiling for armeabi-v7a.
Any suggestions?
After some more fiddling I discovered that it crashes whenever I assign something to a string that was the empty string beforehand. I think it has something to do with my libstdc++. Here are my compilation and linking flags:
[ 50%] Building CXX object CMakeFiles/Mathrix.dir/main.cpp.o
/opt/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ -DMathrix_EXPORTS -DANDROID -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ --sysroot=/opt/android-ndk/platforms/android-9/arch-arm -fsigned-char -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fdata-sections -ffunction-sections -fPIC -Wno-psabi -frtti -fexceptions -marm -Os -finline-limit=64 -fno-strict-aliasing -fno-omit-frame-pointer -DDEBUG -D_DEBUG -DDEBUG -fPIC -isystem /opt/android-ndk/platforms/android-9/arch-arm/usr/include -isystem /opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.6/include -isystem /opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/include -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/include -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/../Externals/lua/src -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/../Externals/libpng -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/../Externals/zlib -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/../Externals/uremote/include -I/home/da_petcu21/src/Porkholt/Examples/Mathrix/../../Engine/../Externals/openal-soft/include -o CMakeFiles/Mathrix.dir/main.cpp.o -c /home/da_petcu21/src/Porkholt/Examples/Mathrix/main.cpp
Linking CXX shared library ../libs/armeabi-v7a/libMathrix.so
/usr/bin/cmake -E cmake_link_script CMakeFiles/Mathrix.dir/link.txt --verbose=Yes
/opt/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ -fPIC --sysroot=/opt/android-ndk/platforms/android-9/arch-arm -fsigned-char -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fdata-sections -ffunction-sections -fPIC -Wno-psabi -frtti -fexceptions -marm -Os -finline-limit=64 -fno-strict-aliasing -fno-omit-frame-pointer -DDEBUG -D_DEBUG -DDEBUG -Wl,--fix-cortex-a8 -Wl,--gc-sections -Wl,--no-undefined -shared -Wl,-soname,libMathrix.so -o ../libs/armeabi-v7a/libMathrix.so CMakeFiles/Mathrix.dir/main.cpp.o -L/opt/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/user/libs/armeabi-v7a -L/home/da_petcu21/src/Porkholt/Examples/Mathrix/build-android/armeabi-v7a/CMakeFiles/ndklibs/armeabi-v7a -L/home/da_petcu21/src/Porkholt/Examples/Mathrix/build-android/libs/armeabi-v7a -lPorkholt -llua -Wl,-rpath,/opt/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/user/libs/armeabi-v7a:/home/da_petcu21/src/Porkholt/Examples/Mathrix/build-android/armeabi-v7a/CMakeFiles/ndklibs/armeabi-v7a:/home/da_petcu21/src/Porkholt/Examples/Mathrix/build-android/libs/armeabi-v7a
The build script I’m using copies libgnustl_static to /home/da_petcu21/src/Porkholt/Examples/Mathrix/build-android/armeabi-v7a/CMakeFiles/ndklibs/armeabi-v7a/libstdc++.a
I suspect it uses the one in /opt/android-ndk/platforms/android-9/arm/lib instead
The problem was that stl was linked statically with each of my libraries, thus creating copies of certain globals it required to be shared. (see Can't load native shared library with dependencies in a native activity app for a look over my apk’s library layout).
For future reference, here is a pretty good explanation on why this happens: http://www.trilithium.com/johan/2005/06/static-libstdc/
I managed to solve the problem by simply linking stl dynamically.