[lldb-dev] build fails on linux

[dawn at burble.org]

With the patch submitted Oct.6,2011 to lldb-commits titled
"[Lldb-commits] patch to fix Linux build" (still awaiting review)
the Linux build works.  

In addition to setting the PYTHONPATH to find lldb.py, I also needed to add
$llvm/tools/lldb/examples/synthetic so lldb could find gnu_libstdcpp.  Without
this, you get "ImportError: No module named gnu_libstdcpp" when starting lldb.
(Please let us know if that's not the intended gnu_libstdcpp module).

When debugging a simple test case with lldb on Linux (uname -a : Linux
ack.localdomain 2.6.39.3 #1 SMP Sat Jul 9 21:24:58 PDT 2011 i686 i686 i386
GNU/Linux) lldb crashes with a segv in pthread_mutex_lock.   I've not looked
into this yet.  Here's the stack under gdb:

ack:~/dev/llvm_svnR137311/tools/lldb$gdb --args ../../Debug+Asserts/bin/lldb ~/dev/test/x          GNU gdb (GDB) Fedora (7.2-51.fc14)

Reading symbols from /home/dawn/dev/llvm_svnR137311/Debug+Asserts/bin/lldb...done.
(gdb) r
Starting program: /home/dawn/dev/llvm_svnR137311/Debug+Asserts/bin/lldb /home/dawn/dev/test/x
[Thread debugging using libthread_db enabled]
[New Thread 0xb46e2b70 (LWP 10309)]
[New Thread 0xb3ee1b70 (LWP 10310)]
[New Thread 0xb36e0b70 (LWP 10311)]
[New Thread 0xb2edfb70 (LWP 10312)]
Current executable set to '/home/dawn/dev/test/x' (i386).
(lldb) r
[New Thread 0xb22ffb70 (LWP 10313)]
Detaching after fork from child process 10314.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb22ffb70 (LWP 10313)]
0x49d6cf4d in pthread_mutex_lock () from /lib/libpthread.so.0
Missing separate debuginfos, use: debuginfo-install glibc-2.13-2.i686 keyutils-libs-1.2-6.fc12.i686 krb5-libs-1.8.4-2.fc14.i686 libcom_err-1.41.12-6.fc14.i686 libedit-3.0-3.20090923cvs.fc14.i686 libgcc-4.5.1-4.fc14.i686 libselinux-2.0.96-6.fc14.1.i686 libstdc++-4.5.1-4.fc14.i686 ncurses-libs-5.7-9.20100703.fc14.i686 openssl-1.0.0e-1.fc14.i686 python-2.7-8.fc14.1.i686 python-libs-2.7-8.fc14.1.i686 readline-6.1-2.fc14.i386 zlib-1.2.5-2.fc14.i686
(gdb) bt
#0  0x49d6cf4d in pthread_mutex_lock () from /lib/libpthread.so.0
#1  0xb620e18f in lldb_private::Mutex::Lock (mutex_ptr=0x14) at Mutex.cpp:190
#2  0xb620ddd2 in lldb_private::Mutex::Locker::Locker (this=0xb22febe4, m=...) at Mutex.cpp:46
#3  0xb6c710ec in ProcessMonitor::DoOperation (this=0x0, op=0xb22fec1c) at ProcessMonitor.cpp:1298
#4  0xb6c712d6 in ProcessMonitor::ReadRegisterValue (this=0x0, offset=60, value=...)
    at ProcessMonitor.cpp:1343
#5  0xb6c721c0 in RegisterContextLinux_i386::ReadRegister (this=0x8170ee8, reg_info=0xb7f56294, 
    value=...) at RegisterContextLinux_i386.cpp:419
#6  0xb63c9599 in lldb_private::RegisterContext::ReadRegisterAsUnsigned (this=0x8170ee8, 
    reg_info=0xb7f56294, fail_value=18446744073709551615) at RegisterContext.cpp:163
#7  0xb63c953c in lldb_private::RegisterContext::ReadRegisterAsUnsigned (this=0x8170ee8, reg=7, 
    fail_value=18446744073709551615) at RegisterContext.cpp:153
#8  0xb63c92c7 in lldb_private::RegisterContext::GetSP (this=0x8170ee8, 
    fail_value=18446744073709551615) at RegisterContext.cpp:110
#9  0xb63d210f in lldb_private::StackFrameList::GetFrameAtIndex (this=0x8170e98, idx=0)
    at StackFrameList.cpp:273
#10 0xb63d284b in lldb_private::StackFrameList::SetDefaultFileAndLineToSelectedFrame (
    this=0x8170e98) at StackFrameList.cpp:406
[...]


So clearly the Linux port needs more work, and I'm not sure if I'm going to be
able to give it the attention it needs.

-Dawn


On Mon, Sep 26, 2011 at 03:46:18PM -0700, dawn at burble.org wrote:
> 
> I have lldb rev 140572.
> 
> I followed the instructions here: http://lldb.llvm.org/build.html
> 
> and updated my llvm and clang trees to the documented revision:
>     $grep -m 1 llvm_revision $lldb/scripts/build-llvm.pl 
>     our $llvm_revision = "137311";
> 
> When I build, I get:
> [...]
> llvm[2]: Compiling ClangUserExpression.cpp for Debug+Asserts build
> In file included from ClangUserExpression.cpp:31:0:
> /home/dawn/dev/llvm_svn/tools/lldb/source/Expression/../../include/lldb/Expression/ExpressionSourceCode.h:13:31:
> fatal error: lldb-enumerations.h: No such file or directory
> compilation terminated.
> [...]
> 
> Please help,
> Thanks,
> -Dawn
> 
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