Linux上编译hadoop-2.7.1的libhdfs.so和libhdfs.a

hadoop提供了CMake来编译libhdfs，因此在编译之前需要先安装好CMake工具。

然后进入libhdfs的源代码目录，如：/data/hadoop-2.7.1-src/hadoop-hdfs-project/hadoop-hdfs/src

执行cmake以生成Makefile文件（假设jdk的安装目录为/data/jdk1.7.0_55）：

cmake -DGENERATED_JAVAH=/data/jdk1.7.0_55 -DJAVA_HOME=/data/jdk1.7.0_55 .

成功之后，会在目录下生成Makefile文件，接下来就可以执行make编译生成libhdfs.so和libhdfs.a了。

如果遇到下面这样的错误：

/data/jdk1.7.0_55/jre/lib/amd64/server/libjvm.so: file not recognized: File format not recognized

则需要考虑升级链接器ld，参考说明：https://cloud.tencent.com/developer/article/1403362。

ld是GNU binutils的成员，可以从http://ftp.gnu.org/gnu/binutils/下载到新的版本。

注意在升级gcc和ld之后，需要更新下环境变量PATH，再重执行cmake，否则可能引用的仍然是老版本的gcc和ld。

/data/hadoop-2.7.1-src/hadoop-hdfs-project/hadoop-hdfs/src # cmake -DGENERATED_JAVAH=/data/java_1_7 -DJAVA_HOME=/data/java_1_7

-- The C compiler identification is GNU 4.1.2

-- The CXX compiler identification is GNU 4.1.2

-- Check for working C compiler: /usr/bin/cc

-- Check for working C compiler: /usr/bin/cc -- works

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Detecting C compile features

-- Detecting C compile features - done

-- Check for working CXX compiler: /usr/bin/c++

-- Check for working CXX compiler: /usr/bin/c++ -- works

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

-- Detecting CXX compile features

-- Detecting CXX compile features - done

JAVA_HOME=/data/java_1_7, JAVA_JVM_LIBRARY=/data/java_1_7/jre/lib/amd64/server/libjvm.so

JAVA_INCLUDE_PATH=/data/java_1_7/include, JAVA_INCLUDE_PATH2=/data/java_1_7/include/linux

Located all JNI components successfully.

-- Performing Test HAVE_BETTER_TLS

-- Performing Test HAVE_BETTER_TLS - Success

-- Performing Test HAVE_INTEL_SSE_INTRINSICS

-- Performing Test HAVE_INTEL_SSE_INTRINSICS - Success

-- Looking for dlopen in dl

-- Looking for dlopen in dl - found

-- Found JNI: /data/java_1_7/jre/lib/amd64/libjawt.so  

-- Found PkgConfig: /usr/bin/pkg-config (found version "0.20") 

-- checking for module 'fuse'

--   package 'fuse' not found

-- Failed to find Linux FUSE libraries or include files.  Will not build FUSE client.

-- Configuring done

-- Generating done

-- Build files have been written to: /data/hadoop-2.7.1-src/hadoop-hdfs-project/hadoop-hdfs/src