从Android NDK共享对象中删除exception / unwind函数 [英] Remove exception/unwind functions from Android NDK shared objects

问题描述

无论我尝试什么，例如添加编译器标志 -fno-exceptions -fno-rtti ，我总是在我的共享对象中获取这些异常处理函数： / p>

图片

无论是以C或C ++编译，都会发生这种情况。

编译为C）：

  #include< jni.h> 
 #include< math.h> 
 #include< stdint.h> 
 #include< stdlib.h> 
 #include< string.h> 
  

这里是我编译为C和C ++的问题不需要发生）：

  #include< jni.h> 
 
 #ifndef __cplusplus 
 #include< stdbool.h> 
 #endif 
 
 #include< math.h> 
 
 #ifdef __ANDROID__ 
 #include< GLES2 / gl2.h> 
 #else 
 #error没有针对目标平台的图形实现
 #endif 
 
 #ifdef __ANDROID__ 
 #include< SLES / OpenSLES。 h。 
 #include< SLES / OpenSLES_Android.h> 
 #include< pthread.h> 
 #include< android / asset_manager.h> 
 #include< android / asset_manager_jni.h> 
 #else 
 #error目标平台没有音频实现
 #endif 
 
 #include< time.h> 
 typedef struct timespec timespec; 
 
 //用于malloc，free和memset 
 #include< stdlib.h> 
 #include< string.h> 
  

如何彻底摆脱这些异常处理函数？是否NDK工具链覆盖我的编译器标志的某个地方？

解决方案

这很可能是因为你链接到静态C ++ STL。即使你的模块不使用异常，STL通常也做（NDK STL没有 -fno-exceptions 变体）。

No matter what I try, like adding the compiler flags -fno-exceptions -fno-rtti, I always get these exception-handling functions in my shared objects:

Image

This happens whether I compile as C or C++.

It happens with these includes (compiled as C++ - haven't tried to compile as C):

#include <jni.h>
#include <math.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

Here are all of my includes for the one I have compiled as both C and C++ (most/all of them aren't needed for the problem to occur):

#include <jni.h>

#ifndef __cplusplus
#include <stdbool.h>
#endif

#include <math.h>

#ifdef __ANDROID__
#include <GLES2/gl2.h>
#else
#error "No graphics implementation for the target platform"
#endif

#ifdef __ANDROID__
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include <pthread.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#else
#error "No audio implementation for the target platform"
#endif

#include <time.h>
typedef struct timespec timespec;

// for malloc, free and memset
#include <stdlib.h>
#include <string.h>

How can I get rid of these exception handling functions once and for all? Is the NDK toolchain overriding my compiler flags somewhere?

解决方案

This is most likely because you are linking against a static C++ STL. Even if your module doesn't use exceptions, the STLs usually do (NDK STLs do not have an -fno-exceptions variant).

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