I was trying to link a C static lib with an RN Android C++ TurboModules project via CMakeLists and got blocked by errors. From my understanding, libc should be provided OOTB, but it's not linking somehow. I forced building only for arm64-v8a atm, and the C lib is also compiled for this architecture.
CMakeLists.txt:
cmake_minimum_required(VERSION 3.4.1)
set (CMAKE_VERBOSE_MAKEFILE ON)
set (CMAKE_CXX_STANDARD 11)
# Specifies a path to native header files.
include_directories(
../cpp
../my-static-lib-headers
)
add_library(my-static-lib STATIC IMPORTED)
set_target_properties(my-static-lib PROPERTIES IMPORTED_LOCATION "${CMAKE_SOURCE_DIR}/static/lib/path")
add_library(cpp
SHARED
../cpp/react-native-turbomodule-project.cpp
cpp-adapter.cpp
)
target_link_libraries(cpp my-static-lib)
yarn android:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':react-native-no-backwards:buildCMakeDebug[arm64-v8a]'.
> com.android.ide.common.process.ProcessException: ninja: Entering directory `/.../react-native-no-backwards/android/.cxx/Debug/1w152j5w/arm64-v8a'
[1/1] Linking CXX shared library ../../../../build/intermediates/cxx/Debug/1w152j5w/obj/arm64-v8a/libcpp.so
FAILED: ../../../../build/intermediates/cxx/Debug/1w152j5w/obj/arm64-v8a/libcpp.so
: && /.../Library/Android/sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ --target=aarch64-none-linux-android21 --sysroot=/.../Library/Android/sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/darwin-x86_64/sysroot -fPIC -O2 -frtti -fexceptions -Wall -fstack-protector-all -g -fno-limit-debug-info -Wl,--build-id=sha1 -Wl,--no-rosegment -Wl,--fatal-warnings -Qunused-arguments -Wl,--no-undefined -shared -Wl,-soname,libcpp.so -o ../../../../build/intermediates/cxx/Debug/1w152j5w/obj/arm64-v8a/libcpp.so CMakeFiles/cpp.dir/.../react-native-no-backwards/ffi/ifaddrs.cpp.o CMakeFiles/cpp.dir/.../react-native-no-backwards/cpp/react-native-no-backwards.cpp.o CMakeFiles/cpp.dir/cpp-adapter.cpp.o ../../../../../ffi/arm64-v8a/libffi.a /.../Library/Android/sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr/lib/aarch64-linux-android/21/liblog.so -static-libstdc++ -latomic -lm && :
ld: error: undefined symbol: stdout
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_cipher_profile) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_cipher_profile) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_set_log) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced 1 more times
ld: error: undefined symbol: stderr
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_cipher_profile) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_cipher_profile) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by sqlite3.c
>>> sqlite3.o:(sqlcipher_set_log) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced 31 more times
ld: error: undefined symbol: stdin
>>> referenced by ui_openssl.c
>>> ui_openssl.o:(open_console) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by ui_openssl.c
>>> ui_openssl.o:(open_console) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced by ui_openssl.c
>>> ui_openssl.o:(close_console) in archive ../../../../../ffi/arm64-v8a/libffi.a
>>> referenced 1 more times
clang-12: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
The stdout and related symbols are only in libc as of android API level 23, which was released 8 years ago.
% for x in */libc.so; do nm $x | grep -q stdout && echo $x; done
23/libc.so
24/libc.so
26/libc.so
27/libc.so
28/libc.so
29/libc.so
30/libc.so
31/libc.so
32/libc.so
33/libc.so