无法使用 CMAKE 将 bulletphysics 编译为用于 android-ndk C++ 项目的静态库

如何解决无法使用 CMAKE 将 bulletphysics 编译为用于 android-ndk C++ 项目的静态库

我尝试使用 CMAKE for Android NDK（Android studio + Clang 编译器）将 bulletphysics 编译为静态库这是主要的 CMakeLists.txt：

cmake_minimum_required(VERSION 3.10)

set(BULLET_VERSION "3.17")

add_deFinitions(-DUSE_PTHREADS -DSCE_PFX_USE_SIMD_VECTORMATH)
add_compile_options(-pthread)

add_subdirectory(LinearMath)
add_subdirectory(Bullet3Common)
add_subdirectory(BulletCollision)
add_subdirectory(BulletDynamics)
add_subdirectory(BulletSoftBody)
add_subdirectory(BulletInverseDynamics)

add_library(bullet-static STATIC Donothing.cpp) # Donothing.cpp for help compiler recognize language. Contains 1 empty method
target_link_libraries(bullet-static LinearMath-static Bullet3Common-static BulletCollision-static BulletDynamics-static BulletSoftBody-static BulletInverseDynamics-static)

接下来我将此项目符号静态库链接到名为 engine-static 的其他静态库，并将引擎静态库链接到共享库 main:
子弹静态（静态）-> 引擎静态（静态）-> 主（共享）

编译后出现错误：

Failed: D:/Programmy/Android/android-project/app/build/intermediates/cmake/debug/obj/arm64-v8a/libmain.so 
cmd.exe /C "cd . && C:\Users\v\AppData\Local\Android\Sdk\ndk\21.1.6352462\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android23 --gcc-toolchain=C:/Users/v/AppData/Local/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/windows-x86_64 --sysroot=C:/Users/v/AppData/Local/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/windows-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security   -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,libgcc_real.a -Wl,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libmain.so -o D:\Programmy\Android\android-project\app\build\intermediates\cmake\debug\obj\arm64-v8a\libmain.so src/CMakeFiles/main.dir/main.cpp.o src/CMakeFiles/main.dir/GUILayer.cpp.o src/CMakeFiles/main.dir/SceneLayer.cpp.o  Beryll_engine/libBeryll-static.a -lGLESv3 Beryll_engine/libs/SDL2/libSDL2.a -lm -ldl -llog -landroid D:/Programmy/Android/android-project/app/build/intermediates/cmake/debug/obj/arm64-v8a/libhidapi.so -llog -lGLESv1_CM -lGLESv2 -Wl,--no-undefined Beryll_engine/libs/SDL2_image/libSDL2_image-static.a Beryll_engine/libs/SDL2_image/jpeg/libjpeg-static.a Beryll_engine/libs/SDL2_image/png/libpng16.a C:/Users/v/AppData/Local/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/lib/aarch64-linux-android/libz.a C:/Users/v/AppData/Local/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/lib/aarch64-linux-android/libm.a Beryll_engine/libs/SDL2_mixer/libSDL2_mixer-static.a Beryll_engine/libs/SDL2_mixer/mp3/libmpg123-static.a Beryll_engine/libs/imgui/libImGUI-static.a Beryll_engine/libs/assimp/code/libassimp.a Beryll_engine/libs/assimp/contrib/zlib/libzlibstatic.a Beryll_engine/libs/assimp/contrib/irrXML/libIrrXML.a Beryll_engine/libs/sqlite/libsqlite3-static.a Beryll_engine/libs/bullet/libbullet-static.a Beryll_engine/libs/bullet/LinearMath/libLinearMath-static.a Beryll_engine/libs/bullet/Bullet3Common/libBullet3Common-static.a Beryll_engine/libs/bullet/BulletCollision/libBulletCollision-static.a Beryll_engine/libs/bullet/BulletDynamics/libBulletDynamics-static.a Beryll_engine/libs/bullet/BulletSoftBody/libBulletSoftBody-static.a Beryll_engine/libs/bullet/BulletInverseDynamics/libBulletInverseDynamics-static.a -latomic -lm && cd ."
Beryll_engine/libs/bullet/BulletDynamics/libBulletDynamics-static.a(btTypedConstraint.cpp.o): In function `~btRigidBody':
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/..\BulletDynamics/Dynamics/btRigidBody.h:178: undefined reference to `btCollisionObject::~btCollisionObject()'
Beryll_engine/libs/bullet/BulletDynamics/libBulletDynamics-static.a(btRigidBody.cpp.o): In function `btRigidBody':
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/Dynamics/btRigidBody.cpp:29: undefined reference to `btCollisionObject::btCollisionObject()'
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/Dynamics/btRigidBody.cpp:32: undefined reference to `btCollisionObject::~btCollisionObject()'
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/Dynamics/btRigidBody.cpp:34: undefined reference to `btCollisionObject::btCollisionObject()'
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/Dynamics/btRigidBody.cpp:38: undefined reference to `btCollisionObject::~btCollisionObject()'
Beryll_engine/libs/bullet/BulletDynamics/libBulletDynamics-static.a(btRigidBody.cpp.o): In function `btRigidBody::serialize(void*,btSerializer*) const':
D:/Programmy/Android/android-project/app/jni/Beryll_engine/libs/bullet/BulletDynamics/Dynamics/btRigidBody.cpp:469: undefined reference to `btCollisionObject::serialize(void*,btSerializer*) const'
Beryll_engine/libs/bullet/BulletDynamics/libBulletDynamics-static.a(btRigidBody.cpp.o):(.data.rel.ro._ZTI11btRigidBody+0x10): undefined reference to `typeinfo for btCollisionObject'
clang++: error: linker command Failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand Failed.

但是当我在 Android.mk 文件的帮助下编译子弹时：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_CFLAGS := $(LOCAL_C_INCLUDES:%=-I%) -DUSE_PTHREADS -mfpu=neon -mfloat-abi=softfp -pthread -DSCE_PFX_USE_SIMD_VECTORMATH

# apply these flags if needed 
# -ffast-math -funsafe-math-optimizations

# apply this to disable optimization
# TARGET_CFLAGS := $(TARGET_CFLAGS) -O0

# apply these 2 to turn on assembly output (*.c/*.cpp to *.s file)
#compile-cpp-source = $(eval $(call ev-compile-cpp-source,$1,$(1:%$(LOCAL_CPP_EXTENSION)=%.s)))
#TARGET_CFLAGS := $(TARGET_CFLAGS) -S

# Enable or disable NEON. Don't forget to apply,or not apply,-mfpu=neon and -mfloat-abi=softfp
# flags in addition,e.g.,if this is true both of those need to be included in LOCAL_CFLAGS
# to avoid the possibility that ndk-build will "forget" to add them on some files
LOCAL_ARM_NEON := true

TARGET_CFLAGS := $(filter-out -ffpu=vfp,$(TARGET_CFLAGS))

# setup to build static library
LOCAL_MODULE := bulletPhysics

LOCAL_C_INCLUDES :=  $(LOCAL_PATH)/src

#find all the file recursively under jni/
FILE_LIST := $(wildcard \
        $(LOCAL_PATH)/src/LinearMath/*.cpp \
        $(LOCAL_PATH)/src/Bullet3Common/*.cpp \
        $(LOCAL_PATH)/src/BulletCollision/broadphaseCollision/*.cpp \
        $(LOCAL_PATH)/src/BulletCollision/Collisiondispatch/*.cpp \
        $(LOCAL_PATH)/src/BulletCollision/CollisionShapes/*.cpp \
        $(LOCAL_PATH)/src/BulletCollision/NarrowPhaseCollision/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/ConstraintSolver/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/Dynamics/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/Featherstone/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/MLcpsolvers/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/Vehicle/*.cpp \
        $(LOCAL_PATH)/src/BulletDynamics/Character/*.cpp \
        $(LOCAL_PATH)/src/BulletSoftBody/*.cpp \
        $(LOCAL_PATH)/src/BulletInverseDynamics/*.cpp \
        $(LOCAL_PATH)/src/BulletInverseDynamics/details/*.cpp \
        )
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

include $(BUILD_STATIC_LIBRARY)

一切正常，链接良好。

我应该为 CMAKE 使用额外的设置吗？
为什么链接器看不到 btCollisionObject 构造函数和析构函数？
链接器是否看到编译后的静态库的其余部分？
我最终将静态库链接到共享会不会有问题？

解决方法

我发现了问题所在。在项目符号中，一个模块引用了另一个模块中的内容：
BulletDynamics/Dynamics/btRigidBody.h 中的 btRigidBody 类继承了 BulletCollision/CollisionDispatch/btCollisionObject.h 中的 btCollisionObject 类。

这意味着链接顺序非常重要。链接 BulletDynamics-static 时，BulletCollision-static 必须已经链接！

我认为共享库也很重要。

我更改了 target_link_libraries() 中 BulletDynamics-static 和 BulletCollision-static 的顺序，并且所有内容都正确链接。

无法使用 CMAKE 将 bulletphysics 编译为用于 android-ndk C++ 项目的静态库

如何解决无法使用 CMAKE 将 bulletphysics 编译为用于 android-ndk C++ 项目的静态库

解决方法

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