与API级别相比，Android NDK平台版本的确切含义是什么? [英] What's the exact significance of Android NDK platform version compared to API level?

问题描述

我有一个Android应用程序，其中minSdkVersion.apiLevel设置为18 targetSdkVersion.apiLevel设置为23.因此，我将NDK platformVersion设置为18.

I have an Android app with minSdkVersion.apiLevel set to 18 targetSdkVersion.apiLevel set to 23. Accordingly I set the NDK platformVersion to 18.

不幸的是，在将OpenSSL添加到组合中之后，JNI库现在无法链接:

Unfortunately after adding OpenSSL to the mix, the JNI library now fails to link:

/Users/pol/Downloads/Cross/External/Android-Libraries/openssl-1.0.2g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'signal'
/Users/pol/Downloads/Cross/External/Android-Libraries/openssl-1.0.2g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'tcsetattr'
/Users/pol/Downloads/Cross/External/Android-Libraries/openssl-1.0.2g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'tcsetattr'
/Users/pol/Downloads/Cross/External/Android-Libraries/openssl-1.0.2g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function open_console: error: undefined reference to 'tcgetattr'

如果将platformVersion设置为21(在19上也不起作用)，问题就消失了.

The problem goes away if setting platformVersion to 21 (it doesn't work either at 19).

如果Android应用程序的API级别为18，但JNI库链接为21，这对Android应用程序意味着什么?在运行4.3的设备上启动时会崩溃吗?

What does this mean for the Android app if it has an API level of 18 but the JNI library was linked for 21? Will it crash at launch on a device running 4.3?

我无法想象4.3中会缺少signal符号.这是NDK的错误吗?

I cannot imagine the signal symbol be missing from 4.3 though. Is this an NDK bug?

推荐答案

当您在android-20或更早版本上安装共享库时，这正是共享库将发生的情况:它将无法加载.缺少signal，您应该不会感到惊讶:Android运行时从未打算运行curl等命令行工具.

This is exactly what will happen to your shared library when you install it on android-20 or earlier: it will fail to load. You should not be surprised that signal was missing: Android runtime was never intended to run command-line tools like curl.

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