Android的NDK：如何让GCC使用其他包含目录 [英] Android NDK: how to let gcc to use additional include directories

问题描述

一个简单的问题（我使用的Andr​​oid NDK R6与Cygwin的，但这是对于makefile和海湾合作委员会的问题）。假设我把JNI /目录下的目录mylib_v_1 /下的库。 mylib中的结构为：

A simple questions (i am using android NDK r6 with cygwin, but this is a question regarding makefiles and gcc). Suppose that i put under jni/ directory a library under the dir mylib_v_1/. Mylib is structured as:

mylib_v_1
   mylib
      include

下包括目录下有两个文件，​​myinc1.hpp和myinc2.hpp。在myinc1.hpp有一行如下：

Under the include directory there are two files, myinc1.hpp and myinc2.hpp. In myinc1.hpp there is a line as:

#include <mylib/myinc2.hpp>

在我的.cpp文件中，JNI /目录下，有以下行：

in my .cpp file, under the jni/ directory, there is the following line:

#include <mylib/myinc1.hpp>

我想设置的Andr​​oid.mk（或需要设置什么其他文件），以让GCC知道使用，作为附加包括目录，JNI / mylib_v_1 /为了使用的#include括号（而不是两个文件，​​在我的真实案例有很多.HPP的，其中包括了很多其他的.HPP括号表示法）。

I want to setup the Android.mk (or what other files needs to be set up) in order to let gcc to know to use, as additional include directory, jni/mylib_v_1/ in order to use #include with brackets (instead of two files, in my real case there are a lot of .hpp that includes a lot of other .hpp with brackets notation).

我怎样才能做到这一点？

How can i do this?

THX。

诗。
如果在.cpp文件我改变包括以这种方式：

Ps. If, in the .cpp file i change the include in this way:

#include "mylib/myinc1.hpp"

GCC找到myinc1.hpp但是，在处理它，它找到第二个包括：

gcc find myinc1.hpp but, while processing it, it find the second include:

#include  <mylib/myinc2.hpp>

和停在那里，说是无法找到文件myinc2.hpp。

and stop there, saying that it is not able to find the file myinc2.hpp.

推荐答案

选项1：

添加以下行之一的Andr​​oid.mk您选择的模块中：

Add one of the following lines to your Android.mk inside a module of your choice:

   LOCAL_C_INCLUDES := /path/to/your/includes # ignore previous includes
                                              # OR
   LOCAL_C_INCLUDES += /path/to/your/includes # preserve previous includes

如果有必要，您可以创建为'/路径/要/你/包括环境变量指向的，包括它是这样的：

If necessary you could create an environment variable pointing at '/path/to/your/includes' and include it like this:

   LOCAL_C_INCLUDES := $(MYLIB_INCLUDES_PATH) # ignore previous includes
                                              # OR
   LOCAL_C_INCLUDES += $(MYLIB_INCLUDES_PATH) # preserve previous includes

选项2：

1. 在它（MYLIB）复制所有的报头文件完整的文件夹到你项目的JNI文件夹中。

1. Copy the complete folder with all header-files in it (mylib) into the 'jni' folder of your project.

以下行添加到您的Andr​​oid.mk您选择的模块中：

Add the following line to your Android.mk inside a module of your choice:

LOCAL_C_INCLUDES := $(LOCAL_PATH)/mylib

或

LOCAL_C_INCLUDES += $(LOCAL_PATH)/mylib

根据是否有previous包括与否。

Depending on whether there are previous includes or not.

选项3：

安装CDT的Eclipse插件和绝对路径添加到MYLIB目录到项目的包含路径。这里是一个伟大的教程，显示所有必要的步骤。

Install the CDT plugin for Eclipse and add the absolute path to the 'mylib' directory to the include paths of your project. Here is a great tutorial that shows all the necessary steps.

<一个href=\"http://mhandroid.word$p$pss.com/2011/01/23/using-eclipse-for-android-cc-development/\">http://mhandroid.word$p$pss.com/2011/01/23/using-eclipse-for-android-cc-development/

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