【Java】macOS下编译JDK8

安装mercurial

brew install mercurial

下载源码

1234	hg clone http://hg.openjdk.java.net/jdk8/jdk8 java-sourcecd java-sourcechmod +x get_source.sh./get_source.sh

安装依赖

brew install freetype

修改源代码

修改前:

1	inline friend relocInfo prefix_relocInfo(int datalen=0);

修改后:

1	inline friend relocInfo prefix_relocInfo(int datalen);

2. 修改generated-configure.sh的20061和21640行（common/autoconf/generated-configure.sh），解决`configure: error: GCC compiler is required` 错误

修改前为:

1	as_fn_error $? "GCC compiler is required. Try setting --with-tools-dir." "$LINENO" 5

修改后为:

1	#as_fn_error $? "GCC compiler is required. Try setting --with-tools-dir." "$LINENO" 5

本机的xcode为7.3.1，编译器为clang，版本为Apple LLVM version 7.3.0 (clang-703.0.31)；而jdk编译默认需要gcc编译器，由于clang703已经支持大部分的gcc语法，因此此处是直接注释掉编译器检查，当然也可以安装gcc编译器进行编译；
注意：编译器的版本很重要，否则会报一大堆语法错误；如果采用gcc,要求>=3.81

`_igvn.type(rng)->is_int() >= 0` 改成 `_igvn.type(rng)->is_int()->_lo >= 0`

否则会出现以下错误：

/Volumes/Working/java-source/hotspot/src/share/vm/opto/loopPredicate.cpp:775:73: error: ordered comparison between pointer and zero ('const TypeInt *' and 'int')      assert(rng->Opcode() == Op_LoadRange || _igvn.type(rng)->is_int() >= 0, "must be");                                              ~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~

大专栏【Java】macOS下编译JDK8-修改hotspot-src-share-vm-runtime-virtualspace-cpp">4. 修改hotspot/src/share/vm/runtime/virtualspace.cpp

base() > 0 改成 base() != 0

否则会出现以下错误：

123	/Volumes/Working/java-source/hotspot/src/share/vm/runtime/virtualspace.cpp:331:14: error: ordered comparison between pointer and zero ('char *' and 'int') if (base() > 0) { ~~~~~~ ^ ~

编译

1	chmod a+x configure

编译配置

./configure --with-debug-level=slowdebug  --with-boot-jdk=/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home --with-freetype-include=/usr/local/Cellar/freetype/2.9.1/include/freetype2 --with-freetype-lib=/usr/local/Cellar/freetype/2.9.1/lib --with-target-bits=64 --with-jvm-variants=server --with-jdk-variant=normal --with-milestone=internal  --with-num-cores=2 --with-jobs=4 CC=clang CXX=clang++

注意：上面带版本号的地方（本机JDK路径，freetype路径）根据实际情况替换

若正常，会出现以下输出：

编译

1	make COMPILER_WARNINGS_FATAL=false LFLAGS='-Xlinker -lstdc++' CC=clang USE_CLANG=true LP64=1

完成

最后我们看到了这样的输出

123456789101112

----- Build times -------Start 2018-09-13 10:47:14End   2018-09-13 10:58:2400:02:12 corba00:00:39 hotspot00:00:56 jaxp00:00:59 jaxws00:06:21 jdk00:00:00 langtools00:11:10 TOTAL-------------------------Finished building OpenJDK for target 'default'

测试

$ cd build/macosx-x86_64-normal-server-slowdebug/jdk/bin$ ./java -versionopenjdk version "1.8.0-internal-debug"OpenJDK Runtime Environment (build 1.8.0-internal-debug-kiva_2018_02_24_20_52-b00)OpenJDK 64-Bit Server VM (build 25.0-b70-debug, mixed mode)

https://imkiva.com/2018/02/24/building-openjdk8-on-macos/

https://www.jianshu.com/p/4e01daf8c357

https://juejin.im/post/5a6d7d106fb9a01ca47abd8b

来源：https://www.cnblogs.com/lijianming180/p/12262515.html

标签

gcc