Android NDK always records runtime dependency against stdc++ (#17863) · Issues · CMake / CMake

Android NDK always records runtime dependency against stdc++

Regardless of the CMAKE_ANDROID_STL_TYPE chosen (e.g., c++_static), all shared libraries and executables built with the Android NDK are linked against stdc++.

I'm attaching a simple test case that reproduces the issue (change NDK_ROOT in run.sh to point to the NDK and then run run.sh): CMakeLists.txt run.sh test_lib.cc test.cc

Newer versions of clang support the nostdlib++ flag, but the latest stable NDK (16b) does not have a version of clang with that flag: https://reviews.llvm.org/D35780

Also see this NDK issue: https://github.com/android-ndk/ndk/issues/105

As a workaround, you can use the C compiler to link instead of the C++ compiler in your project:

string(REPLACE "CMAKE_CXX_COMPILER" "CMAKE_C_COMPILER" CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY}")
string(REPLACE "CMAKE_CXX_COMPILER" "CMAKE_C_COMPILER" CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}")
link_libraries(m)

Another option is to set -nodefaultlibs and manually add in the necessary libs: https://github.com/android-ndk/ndk/issues/105#issuecomment-327409972

Regardless of the `CMAKE_ANDROID_STL_TYPE` chosen (e.g., `c++_static`), all shared libraries and executables built with the Android NDK are linked against stdc++.

I'm attaching a simple test case that reproduces the issue (change `NDK_ROOT` in `run.sh` to point to the NDK and then run `run.sh`):
[CMakeLists.txt](/uploads/c11827e801f29e15c6883b1e51816762/CMakeLists.txt)
[run.sh](/uploads/2eb735d85da589bfd1c7a9ccd55a7adb/run.sh)
[test_lib.cc](/uploads/a24948b335bfc22ad2ba3062e33eb594/test_lib.cc)
[test.cc](/uploads/d959a3137386b56e3f64b255a26943e3/test.cc)

Newer versions of clang support the `nostdlib++` flag, but the latest stable NDK (16b) does not have a version of clang with that flag: https://reviews.llvm.org/D35780

Also see this NDK issue: https://github.com/android-ndk/ndk/issues/105

As a workaround, you can use the C compiler to link instead of the C++ compiler in your project:
```
string(REPLACE "CMAKE_CXX_COMPILER" "CMAKE_C_COMPILER" CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY}")
string(REPLACE "CMAKE_CXX_COMPILER" "CMAKE_C_COMPILER" CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}")
link_libraries(m)
```

Another option is to set `-nodefaultlibs` and manually add in the necessary libs: https://github.com/android-ndk/ndk/issues/105#issuecomment-327409972

Edited Apr 02, 2018 by Tom Hughes