The new toolchain file requires Android NDK r12b and above. Default to use 'arm-linux-androideabi-clang' toolchain and LLVM libc++ STL runtime.
Align all the compiler and linker flags according to new ndk-build configuration in Android NDK r12b, i.e. no more '-f[no-]strict-aliasing' and '-f[no-]omit-frame-pointer', but more stringent warnings check.
Improve over the old toolchain file where most of the options are now changeable after the initial configuration. The exceptions are ANDROID_NDK and ANDROID_TOOLCHAIN_NAME due to limitation of CMake.
Close#1441.
Other changes in this commit includes:
- Fix Android sample launcher app to support shared C++ STL runtime library.
- Remove temporary fix in FindUrho3D module as it is not required anymore with our new toolchain file.
- Fix Log::WriteRaw() method to pass the parameters correctly to __android_log_print() function.
- Fix enable_pch() macro to emit -fPIC compiler flags correctly based on target's POSITION_INDEPENDENT_CODE property.
- Fix linker flags for ld.bfd where it needs help to find the location of the rooted shared libraries. The flags are not required for ld.gold but they do no harm for gold linker.
- Enhance the CheckCompilerToolchain module to auto-detect if the NEON SIMD is enabled or not for Android build (based on the chosen ANDROID_ABI).
Use CMAKE_SYSROOT to manage the sysroot automatically when cross-compiling instead of adding the '--sysroot' flag manually everywhere. We only need to add it manually in places where CMake does not, like in our custom GCC/Clang response file for PCH.
Differentiate between setting up header search path for system headers and for application headers so that GCC/Clang may suppress compilation warnings from the former, if any.
Remove hardcoding of indirect dependency libraries list in the FindUrho3D.cmake module. Instead we now rely on the linker to find those indirect dependencies automatically with our hint via "-runpath-link" linker flag, especially when cross-compiling.
Also setup GLESv2 (and GLESv1_CM) for Raspberry-Pi in the same manner as generic ARM and Android platforms.
Add a new build option "ARM_ABI_FLAGS" for supplying additional ABI compiler flags when targeting generic arm.
Fix Linux build from using OpenGLES instead of GLEW, fix RPI build from using wrong OpenGLES library, fix iOS build from using arm-specific compiler flags directly which would cause problem in universal binary build containing iphonesimulator archs as well.
And other minor refactoring.
The wait_for_block() was originally needed for iOS platform as it used to install very slowly (exceeds 10 minutes) due to configuration mistake. It should install just in a few minutes now.
The auto-discovered variables are removed as build options from cmake-gui when it is invoked by Urho3D downstream projects.
Still, ensure the auto-discovered variables prevail over conflicting values potentially specified by user manually or via CLI.
Check the CMake minimum version before setting project name as recommended by CMake.
Minor documentation update on how to setup downstream projects using Urho3D library as external library.
For AppVeyor - attempt to add scaffolding test using Urho3D SDK.
