/* gc */                                                                 \
                                                                             \
product(bool, UseMyGC, false,                               \
          "Use the my garbage collector")                   \
                                                                             \  
product(bool, UseSerialGC, false,                          \
          "Use the serial garbage collector")               \

//...

#
# A fatal error has been detected by the Java Runtime Environment:#
#  Internal Error (globals.cpp:374), pid=20750, tid=140406270584576#  guarantee(faddr != NULL && faddr->is_uintx()) failed: wrong flag type
#
# JRE version: 6.0_24-b24
# Java VM: OpenJDK 64-Bit Server VM (21.0-b17 mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#...

---------------  T H R E A D  ---------------

Current thread is native thread
Stack: [0x00007fb2e1d1e000,0x00007fb2e1e1f000],  sp=0x00007fb2e1e1c9b0,  free space=1018k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)V  [libjvm.so+0x7fbd09]  VMError::report_and_die()+0x169
V  [libjvm.so+0x3ca13a]  report_vm_error(char const*, int, char const*, char const*)+0x4a
V  [libjvm.so+0x471be0]  CommandLineFlagsEx::uintxAtPut(CommandLineFlagWithType, unsigned long, FlagValueOrigin)+0x60
V  [libjvm.so+0x21d1e3]  Arguments::set_heap_size()+0x173
V  [libjvm.so+0x221540]  Arguments::parse(JavaVMInitArgs const*)+0x5f0
V  [libjvm.so+0x7bdf0d]  Threads::create_vm(JavaVMInitArgs*, bool*)+0x8d
V  [libjvm.so+0x5028aa]  JNI_CreateJavaVM+0x5a
C  [gamma+0x517b]  getenv@@GLIBC_2.2.5+0x517b
C  [gamma+0x3adb]  JavaMain+0xc1

...
Missing separate debuginfos, use: debuginfo-install glibc-2.14.90-24.fc16.9.x86_64 java-1.6.0-openjdk-1.6.0.0-71.1.11.6.fc16.x86_64
(gdb) thread 139790463624960
Thread ID -2131925248 not known.
(gdb) stack
Undefined command: "stack".  Try "help".
(gdb) breakpoints
Undefined command: "breakpoints".  Try "help".
(gdb) help
List of classes of commands:

aliases -- Aliases of other commandsbreakpoints -- Making program stop at certain points
data -- Examining data
files -- Specifying and examining files
internals -- Maintenance commandsobscure -- Obscure featuresrunning -- Running the programstack -- Examining the stack
status -- Status inquiries
support -- Support facilities
tracepoints -- Tracing of program execution without stopping the program
user-defined -- User-defined commands

Type "help" followed by a class name for a list of commands in that class.Type "help all" for the list of all commands.
...

1、干净的OpenJDK7源码啥也不改build可以通过，不会crash的

2、按照您说的clean之后再make，顺利通过，感叹一句，R大真心太牛逼了

3、不知道为什么，这个gdb启动后命令都不好用

跟牛逼啥的没关系，只是做HotSpot VM开发的话大家迟早都会踩一次这个坑。

我这边build一次也就3分钟，如果我改过头文件的话就肯定会做一次clean build，免得出了诡异问题还得慢慢找原因。人懒，呵呵…

前面省略的部分或许说明了原因…可能有啥报错信息你看漏了

[09:36 .._compiler2/product] gdb /proc/8107/exe 8107
GNU gdb (GDB) Fedora (7.3.50.20110722-16.fc16)
Copyright (C) 2011 Free Software Foundation, Inc.License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /proc/8107/exe...done.
Attaching to program: /proc/8107/exe, process 8107
Reading symbols from ./libjvm.so...(no debugging symbols found)...done.
Loaded symbols for ./libjvm.so
Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7f2380ed6700 (LWP 8108)]Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/libverify.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/libverify.so
Reading symbols from /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/libjava.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/libjava.so
Reading symbols from /lib64/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libnsl.so.1
0x000000318ba09080 in pthread_join () from /lib64/libpthread.so.0
Missing separate debuginfos, use: debuginfo-install glibc-2.14.90-24.fc16.9.x86_64 java-1.6.0-openjdk-1.6.0.0-71.1.11.6.fc16.x86_64
(gdb) thread 139790463624960
Thread ID -2131925248 not known.
(gdb) stack
Undefined command: "stack".  Try "help".
(gdb) breakpoints
Undefined command: "breakpoints".  Try "help".(gdb) help
List of classes of commands:
...

学长您过谦了，小弟比您低了三届也是nju se的。。咱nju的就是低调。。

这个是指任何头文件吗？修改了哪些文件需要重新clean build呢？

我翻了下前面的信息貌似没什么特别奇怪的。。