刚刚下载的NDK在链接旧项目时失败:
/usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi
看来,clang隐藏在gcc的面具后面:
/opt/android-ndk-r18b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --version
Android (4751641 based on r328903) clang version 7.0.2 (https://android.googlesource.com/toolchain/clang 003100370607242ddd5815e4a043907ea9004281) (https://android.googlesource.com/toolchain/llvm 1d739ffb0366421d383e04ff80ec2ee591315116) (based on LLVM 7.0.2svn)
Target: arm--linux-android
Thread model: posix
InstalledDir: /opt/android-ndk-r18b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../../../../llvm/prebuilt/linux-x86_64/bin
它只是这个NDK版本中的一个错误还是故意制作的?
刚刚下载的NDK在链接旧项目时失败:/usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi看来,clang隐藏在gcc的面具后面:/opt/android-ndk-r18b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androide...
BOOK DESCRIPTION
Android
NDK
is used for multimedia applications which require direct access to a system’s resources.
Android
NDK
is also the key for portability, which in turn provides a reasonably comfortable development and debugging process using familiar tools such as
GCC
and Clang toolchains. If your wish to build
Android
games using this amazing framework, then this book is a must-have.
This book provides you with a number of clear step-by-step recipes which will help you to start developing mobile games with
Android
NDK
and boost your productivity debugging them on your computer. This book will also provide you with new ways of
TABLE OF CONTENTS
Chapter 1. Establishing a Build Environment
Chapter 2. Porting Common Libraries
Chapter 3. Networking
Chapter 4. Organizing a Virtual Filesystem
Chapter 5. Cross-platform Audio Streaming
Chapter 6. Unifying OpenGL ES 3 and OpenGL 3
一般而言在
Android
上使用JAVA实现彩图转换为灰度图,与J2ME上的实现方法类似,不过遇到频繁地转换或者是大图转换时,就必须使用
NDK
来提高速度了。本文主要通过JAVA和
NDK
这两种方式来分别实现彩图转换为灰度图,并给出速度的对比,供大家参考。
先来简单地介绍一下
Android
的
NDK
使用步骤:
以
NDK
r4为例,或许以后新版的
NDK
的使用方法略有不同。
1、下载支持C++的
android
-
ndk
-r4-crystax,支持C++的话可玩性更强。
2、下载cygwin,选择ftp://mirrors.kernel.org这个镜像,搜索 Devel Install 安装
gcc
和 m
ISBN-13: 978-1782167785
For C++ developers, this is the book that can swiftly propel you into the potentially profitable world of
Android
games. The 70+ step-by-step recipes using
Android
NDK
will give you the wide-ranging knowledge you need.
Overview
Tips and tricks for developing and debugging mobile games on your desktop
Enhance your applications by writing multithreaded code for audio playback, network access, and asynchronous resource loading
Enhance your game development skills by using modern OpenGL ES and develop applications without using an IDE
Features two ready-to-run
Android
games
In Detail
Android
NDK
is used for multimedia applications which require direct access to a system's resources.
Android
NDK
is also the key for portability, which in turn provides a reasonably comfortable development and debugging process using familiar tools such as
GCC
and Clang toolchains. If your wish to build
Android
games using this amazing framework, then this book is a must-have.
This book provides you with a number of clear step-by-step recipes which will help you to start developing mobile games with
Android
NDK
and boost your productivity debugging them on your computer. This book will also provide you with new ways of working as well as some useful tips and tricks that will demonstrably increase your development speed and efficiency.
This book will take you through a number of easy-to-follow recipes that will help you to take advantage of the
Android
NDK
as well as some popular C++ libraries. It presents
Android
application development in C++ and shows you how to create a complete gaming application.
You will learn how to write portable multithreaded C++ code, use HTTP networking, play audio files, use OpenGL ES, to render high-quality text, and how to recognize user gestures on multi-touch devices. If you want to leverage your C++ skills in mobile development and add performance to your
Android
applications, then this is the book for you.
What you will learn from this book
Port popular C++ libraries to
Android
Write portable multithreaded code
Play audio with OpenAL
Implement gesture recognition
Render text with FreeType
Use OpenGL ES to port and abstract APIs from the game code to develop games on a desktop PC
Debug mobile applications on your desktop
Access Flickr and Picasa web services from C++
Extract resources from APK archives
Develop
Android
applications without an IDE
tar xf
gcc
-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf.tar -C /opt/
2 修改交叉编译链权限:
chmod -Rf 777 /opt/
gcc
-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf/
3 修改/etc/profile,配置PATH。
export ARCH=arm
export CROSS_COMPILE=/opt/
gcc
-linaro-5.3-2016.02-x86
在编译osg的
Android
库时遇到的问题。
使用的
NDK
版本为
android
-
ndk
-r19c,在
android
-
ndk
-r16b中能找到相关的
gcc
程序。
问题原因:
ndk
慢慢把clang作为主编译器,
gcc
将会被移除。
ndk
16b的一个重要发布提示:
GCC
不再受支持,虽然尚未从
NDK
中移除,但其已不再接收向后移植项。只有在 libc++ 足够稳定,可以成为默认 STL 之后,才能移除
GCC
,因为 gnustl 的某些部分仍与 Clang 不兼容。当从 r18 中移除其他 STL