[lldb-dev] Fwd: lldb doesn't work on centos7

[陶征霖 via lldb-dev]

Also I found that the size of my program binary increases from 140M to 180M
after -fno-limit-debug-info is added. Seems a lot of debug info is added?

2015-11-25 10:24 GMT+08:00 陶征霖 <zhenglin.taozl at gmail.com>:

> Hi Pavel,
>
> Thanks for your reply. Seems lldb not finding the variable in the first
> place.
>
> * thread #1: tid = 154, 0x0000000000400e5e a.out`main + 94 at t.cpp:5,
> name = 'a.out', stop reason = breakpoint 1.1
>     frame #0: 0x0000000000400e5e a.out`main + 94 at t.cpp:5
>    2       using namespace std;
>    3       int main() {
>    4          string s = "aa";
> -> 5          cout << s;
>    6       }
> (lldb) frame variable --raw-output s
> (std::__1::string) s = {}
>
> I added -fno-limit-debug-info in my test, and it works now. But why?
>
> Thanks,
> Zhenglin
>
>
>
> 2015-11-24 19:21 GMT+08:00 Pavel Labath <labath at google.com>:
>
>> HI,
>>
>> a couple of random shots in the dark:
>>
>> - could you paste the output of "frame variable --raw-output s"? (This
>> disables lldb's type formatters. The goal is to see if the problem is
>> in the formatter, or in lldb not finding the variable in the first
>> place).
>>
>> - could you compile your test executable with -fno-limit-debug-info
>> and see if that helps?
>>
>> pl
>>
>>
>> On 23 November 2015 at 02:15, 陶征霖 via lldb-dev <lldb-dev at lists.llvm.org>
>> wrote:
>> >
>> > ---------- Forwarded message ----------
>> > From: 陶征霖 <zhenglin.taozl at gmail.com>
>> > Date: 2015-11-20 23:10 GMT+08:00
>> > Subject: lldb doesn't work on centos7
>> > To: llvm-dev at lists.llvm.org
>> >
>> >
>> > Hi,
>> >
>> > I build llvm+clang+lldb 3.7.0 from source code on centos7, the build
>> command
>> > is "cmake -DCMAKE_BUILD_TYPE=Release
>> > -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX} -DLLVM_LIBDIR_SUFFIX=64",
>> there is
>> > no error during building process.
>> >
>> > And then I compile following c++ code using command "clang++ -std=c++11
>> > -stdlib=libc++ -lc++abi -g t.cpp":
>> > // t.cpp
>> > #include <iostream>
>> > using namespace std;
>> > int main() {
>> >    string s = "aa";
>> >    cout << s;
>> > }
>> > Try lldb to debug a.out, found that I can't print string s which shows
>> > empty:
>> > lldb a.out
>> > (lldb) target create "a.out"
>> > Current executable set to 'a.out' (x86_64).
>> > (lldb) l
>> >    4    int main() {
>> >    5       string s = "aa";
>> >    6       cout << s;
>> >    7    }
>> > (lldb) b 6
>> > Breakpoint 1: where = a.out`main + 94 at t.cpp:6, address =
>> > 0x0000000000400e5e
>> > (lldb) r
>> > Process 150 launched: '/root/a.out' (x86_64)
>> > Process 150 stopped
>> > * thread #1: tid = 150, 0x0000000000400e5e a.out`main + 94 at t.cpp:6,
>> name
>> > = 'a.out', stop reason = breakpoint 1.1
>> >     frame #0: 0x0000000000400e5e a.out`main + 94 at t.cpp:6
>> >    3    using namespace std;
>> >    4    int main() {
>> >    5       string s = "aa";
>> > -> 6       cout << s;
>> >    7    }
>> > (lldb) p s
>> > (std::__1::string) $0 = {}
>> >
>> > Could you please help point out what's wrong in my env? Thanks.
>> >
>> > Thanks,
>> > Zhenglin
>> >
>> > _______________________________________________
>> > lldb-dev mailing list
>> > lldb-dev at lists.llvm.org
>> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>> >
>>
>
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