使用cygwin for JNI编译C++代码(Android NDK)

Question

我正在尝试构建一个C++文件，以便通过JNI在我的Android应用程序中使用。我正在使用Cygwin在Windows中构建。我对此完全陌生，不知道自己在做什么。

以下是输出的一部分：

$ g++ -c test_wrap.cxx -I"C:\dev\android-ndk-r4b\build\platforms\android-4\arch-arm\usr\include" -I./include
In file included from C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/sys/_types.h:40,
                 from C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/stdint.h:32,
                 from C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/sys/types.h:34,
                 from C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/strings.h:42,
                 from C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/stdlib.h:42,
                 from test_wrap.cxx:160:
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:44: error: conflicting declaration 'typedef long unsigned int size_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:213: error: 'size_t' has a previous declaration as `typedef unsigned int size_t'
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:44: error: declaration of `typedef long unsigned int size_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:213: error: conflicts with previous declaration `typedef unsigned int size_t'
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:44: error: declaration of `typedef long unsigned int size_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:213: error: conflicts with previous declaration `typedef unsigned int size_t'
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:46: error: conflicting declaration 'typedef long int ptrdiff_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:151: error: 'ptrdiff_t' has a previous declaration as `typedef int ptrdiff_t'
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:46: error: declaration of `typedef long int ptrdiff_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:151: error: conflicts with previous declaration `typedef int ptrdiff_t'
C:/dev/android-ndk-r4b/build/platforms/android-4/arch-arm/usr/include/machine/_types.h:46: error: declaration of `typedef long int ptrdiff_t'/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/stddef.h:151: error: conflicts with previous declaration `typedef int ptrdiff_t'

你能帮我一下吗？

伊曼纽尔

Answer 1

答案很简单，就是创建一个Android.mk文件并使用ndk-build命令。

Answer 2

在Cygwin环境中构建的应用程序假定应用程序将在具有Cygwin DLL的Windows上执行。正如yock所说，你需要建立一个针对Android操作系统的交叉编译器。

Answer 3

我根本不是C/C++专家，但在我看来，您正在尝试使用面向i686的编译器为Arm进行编译。仅仅包含你想要的头文件是不够的，需要一个交叉编译器才能告诉GCC以一个arch为目标。

http://wiki.osdev.org/GCC_Cross-Compiler