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/<关键字>
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dd剪切
yy复制
p粘贴
u撤销
ctrl+r重做
w 保存
wq保存退出
q!退出

find + xargs + grep

find -name Activity.java
find -name '*.java'
find -name '*.java' | xarfs grep 'extends[ \t\n]+ActiviyManagerNative'

Android.mk
LOCAL_SHARED_LIBRARIES := libutils

#include <utils/Call.Stack.h>

CallStack stack;
stack.update();
stack.log("tag");

ninja: build stopped: subcommand failed.
build/core/ninja.mk:148: recipe for target 'ninja_wrapper' failed
make: *** [ninja_wrapper] Error 1

/******/
cd external/doclava && mm -B USE_NINJA=false

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/unistd.h:733:6: note: 'syscall' has been explicitly marked deprecated here
int      syscall(int, ...);
         ^
1 error generated.
[  1% 408/31742] host C++: libc++abi <...xternal/libcxxabi/src/cxa_demangle.cpp
ninja: build stopped: subcommand failed.
make: *** [ninja_wrapper] Error

去到/Applications/XCode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs，发现MacOSX10.11.sdk已经被删除，只剩下MacOSX10.12.sdk，所以首先要去下载10.11的SDK。可以去MacOSX-SDKs下载MacOSX10.11.sdk，解压拷贝到/Applications/XCode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs。为了避免下次升级的时候再被删除，可以放到~/Document/MacOSX10.11.sdk，再给它创建一个软链接：

1
$ ln -s ~/Document/MacOSX10.11.sdk /Applications/XCode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk
然后确保AOSP源码下build/core/combo/mac_version.mk文件中
mac_sdk_versions_supported := 10.9 10.10 10.11
后面不要写10.12。

Unsupported curl, please use a curl not based on SecureTransport
Jack server installation not found
Unsupported curl, please use a curl not based on SecureTransport
Unsupported curl, please use a curl not based on SecureTransport
[  4% 842/20846] host C++: dexdump2 <= art/dexdump/dexdump.cc
ninja: build stopped: subcommand failed.
make: *** [ninja_wrapper] Error 1

#### make failed to build some targets (01:37 (mm:ss)) ####

首先下载curl源码，然后执行

./configure --prefix=/usr/local/curl --with-ssl=/usr/local/Cellar/openssl/1.0.2d_1
make
make install

jack-admin kill-server
jack-admin uninstall-server
cd prebuilts/sdk/tools
jack-admin install-server jack-launcher.jar jack-server-4.7.ALPHA.jar