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我写了一个简单的C++测试程序来测试例外的Android NDK工具链异常处理赛格故障
#include <iostream>
#include <string>
inline bool isNumber(char c);
inline unsigned stringToNum(const char *str) {
unsigned x = 0;
const char *p = str;
while(1) {
if(!isNumber(*p)) {
if(*p == 0 && p != str)
break;
throw 0;
}
x = x * 10 + *p++ - '0';
}
return x;
}
inline bool isNumber(char c) {
return c >= '0' && c <= '9';
}
int main() {
std::string k = std::string("test");
try {
int p = stringToNum(k.c_str());
} catch(...) {
std::cout << "EXCEPTION THROWN";
}
}
我编译两个阶段的程序（我试图模拟误差与存在的更大的图书馆）。第一步看起来像
/Users/me/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/darwin-x86/bin/i686-android-linux-g++ -c -fexceptions -frtti -Wnon-virtual-dtor -Woverloaded-virtual --sysroot "/Users/me/android-ndk-r8/platforms/android-14/arch-x86/" -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -O3 -Wl,-rpath-link=/Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/ -L/Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/ -nostdlib /Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/crtbegin_dynamic.o -lc -lm -I/Users/me/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/include -I/Users/me/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/libs/x86/include exceptiontest.cpp
然后：
/Users/me/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/darwin-x86/bin/i686-android-linux-g++ -fexceptions -fPIC -pthread -rdynamic --sysroot "/Users/me/android-ndk-r8/platforms/android-14/arch-x86/" -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -O3 -Wl,-rpath-link=/Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/ -L/Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/ -nostdlib /Users/me/android-ndk-r8/platforms/android-14/arch-x86/usr/lib/crtbegin_dynamic.o -lc -lm exceptiontest.o -L/Users/me/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/darwin-x86/lib/gcc/i686-android-linux/4.4.3 -L/Users/me/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/libs/x86 -lgnustl_shared -lgcc
当我在设备上运行的a.out（与libgnustl_shared.so复制到libs目录），我得到一个段错误。我错过了什么？编译器标志？图书馆？等
编辑：继承人的段错误关闭GDB的堆栈跟踪
#0 get_cie_encoding (cie=0x6107daff) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2-fde.c:267
#1 0x080b16d8 in classify_object_over_fdes (ob=0x80d8b68, this_fde=0x80d0a1c) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2-fde.c:615
#2 0x080b1a5d in search_object (ob=0x80d8b68, pc=<value optimized out>) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2-fde.c:726
#3 0x080b1f84 in _Unwind_Find_FDE (pc=0x80b10da, bases=0xbfa61204) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2-fde.c:989
#4 0x080b07db in uw_frame_state_for (context=<value optimized out>, fs=0xbfa6102c) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2.c:1128
#5 0x080b0af8 in uw_init_context_1 (context=0xbfa61230, outer_cfa=<value optimized out>, outer_ra=0x809aa14) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind-dw2.c:1447
#6 0x080b10db in _Unwind_RaiseException (exc=0x944d060) at /Users/andrewhsieh/ndk-andrewhsieh/src.1-with-cherrypicks//build/../gcc/gcc-4.4.3/libgcc/../gcc/unwind.inc:88
#7 0x0809aa14 in __cxa_throw()
#8 0x0804b4a7 in main() at exceptiontest.cpp:13
访问**无效**内存位置时会导致分段错误。看看线程更简单的转换方式。[std :: string to int]（http://stackoverflow.com/questions/200090/how-do-you-convert-ac-string-to-an-int） – Mahesh
我知道这不是错误的原因（它为主机平台编译时运行完美）。这与android ndk是如何设置的例外情况有关。 – MEURSAULT