[lldb-dev] LLDB /w Windows and MinGW64
Zachary Turner via lldb-dev
lldb-dev at lists.llvm.org
Mon Mar 28 10:58:53 PDT 2016
For the patch, can you create an account on reviews.llvm.org, and upload
your patch there? This makes interactive reviewing / commenting much
easier. Let me know if you need help getting that set up.
On Mon, Mar 28, 2016 at 10:58 AM Zachary Turner <zturner at google.com> wrote:
> If you compile with MSVC or Clang-cl it wouldn't ask for lldb-server. So
> most likely there is some code that is using #if defined(_MSC_VER) when it
> should be using #if defined(LLVM_ON_WINDOWS).
>
> You'll have to hunt that down, but a good starting point might be to put a
> breakpoint in ProcessWindowsLive::CreateInstance and then work backwards to
> see why that isn't getting called (assuming it's not).
>
> On Mon, Mar 28, 2016 at 9:05 AM Eran Ifrah <eran.ifrah at gmail.com> wrote:
>
>> On Mon, Mar 28, 2016 at 6:56 PM, Zachary Turner <zturner at google.com>
>> wrote:
>>
>>> Patches welcome. If you can split it into independent pieces that would
>>> be helpful, but it's not always possible.
>>>
>>> Patch is attached, I think you will find it quite straight forward -
>> feel free to comment and send it back for revise
>>
>>
>>
>>> The NativeProcessProtocol error, that's the interface that converts
>>> debugging events that occur on the inferior into packets that can be sent
>>> to the server, and vice versa. Since Windows doesn't currently use lldb
>>> server, this piece has never been written for Windows
>>
>> So this raises the question: how come lldb asks for it? (see my first
>> emai inl this conversation)
>> I would have build LLDB in debug mode, but it seems that MinGW as.exe
>> fails to write some of the files "File too big"
>>
>>
>>
>>>
>>> On Mon, Mar 28, 2016 at 8:41 AM Eran Ifrah <eran.ifrah at gmail.com> wrote:
>>>
>>>> On Mon, Mar 28, 2016 at 6:10 PM, Zachary Turner <zturner at google.com>
>>>> wrote:
>>>>
>>>>> I'm the main Windows maintainer,
>>>>
>>>> Hi
>>>>
>>>>
>>>>
>>>>> and while We've gotten things working pretty well on Windows, our
>>>>> effort has been 100% on building with msvc and/or clang-cl. Building with
>>>>> mingw has a different set of pre processor defines and some other subtle
>>>>> differences, so it doesn't surprise me that things don't work quite right.
>>>>>
>>>>> I got it to compile (I have a big patch that I can send you if you
>>>> are interested)
>>>> mainly involves blocking code under __MINGW32__ and some updates to the
>>>> various CMakeLists.txt and AddLLDB.cmake module files
>>>> Some functions are missing in MinGW implementations (like gets_s and
>>>> others :/)
>>>>
>>>>
>>>>
>>>>> You can try getting lldb-server to build and run under Windows, or you
>>>>> can try to get it to use the non lldb server codepath on MinGW, but you may
>>>>> still run into some
>>>>
>>>> I got lldb-server to compile and run on Windows, however, it crashes
>>>> immediately and the backtrace shows this:
>>>>
>>>> 0 0x0000000000724615
>>>> lldb_private::NativeProcessProtocol::Launch(lldb_private::ProcessLaunchInfo&,
>>>> lldb_private::NativeProcessProtocol::NativeDelegate&,
>>>> lldb_private::MainLoopBase&,
>>>> std::shared_ptr<lldb_private::NativeProcessProtocol>&)
>>>> 1 0x00000000005f815d
>>>> lldb_private::process_gdb_remote::GDBRemoteCommunicationServerLLGS::LaunchProcess()
>>>>
>>>> 2 0x00000000004020e5
>>>> handle_launch(lldb_private::process_gdb_remote::GDBRemoteCommunicationServerLLGS&,
>>>> int, char const* const*)
>>>> 3 0x000000000040335e main_gdbserver(int, char**)
>>>> 4 0x000000000188329c main
>>>>
>>>>
>>>> I had to #ifndef __MINGW32__ around lldb-platform.cpp as it contains
>>>> too much Linux code that can not be compiled under Windows (fork, exec*)
>>>> and basically lldb-server calls the main_gdbserver instead of
>>>> main_platform function
>>>>
>>>> Looking at the function that crashes, I see this:
>>>>
>>>> llvm_unreachable("Platform has no NativeProcessProtocol support");
>>>>
>>>> Any ideas?
>>>> Thanks!
>>>>
>>>> issues after that as well, since you're the first person afaik to try
>>>>> building with MinGW
>>>>>
>>>>
>>>>
>>>>> On Sun, Mar 27, 2016 at 10:29 PM Eran Ifrah via lldb-dev <
>>>>> lldb-dev at lists.llvm.org> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have built LLDB on Windows 7 using MinGW64/4.9.2 (took some effort
>>>>>> to get the job done...)
>>>>>> When I tried to debug a simple hello world executable, I get this
>>>>>> output:
>>>>>>
>>>>>> D:\software\msys-for-clang\1.0\home\PC\build-release-64-lldb\bin>lldb.exe
>>>>>> HelloWorld.exe
>>>>>> (lldb) target create "HelloWorld.exe"
>>>>>> Current executable set to 'HelloWorld.exe' (x86_64).
>>>>>> (lldb) b main.cpp:7
>>>>>> Breakpoint 1: where = HelloWorld.exe`main + 26 at main.cpp:7, address
>>>>>> = 0x000000000040154a
>>>>>> (lldb) r
>>>>>> error: process launch failed: unable to locate lldb-server
>>>>>> (lldb)
>>>>>>
>>>>>> I can't seem to locate lldb-server anywhere, and according
>>>>>> to LLDBConfig.cmake, this target should not get built on Windows:
>>>>>>
>>>>>> # Figure out if lldb could use lldb-server. If so, then we'll
>>>>>> # ensure we build lldb-server when an lldb target is being built.
>>>>>> if ((CMAKE_SYSTEM_NAME MATCHES "Darwin") OR
>>>>>> (CMAKE_SYSTEM_NAME MATCHES "FreeBSD") OR
>>>>>> (CMAKE_SYSTEM_NAME MATCHES "Linux") OR
>>>>>> (CMAKE_SYSTEM_NAME MATCHES "NetBSD"))
>>>>>> set(LLDB_CAN_USE_LLDB_SERVER 1)
>>>>>> else()
>>>>>> set(LLDB_CAN_USE_LLDB_SERVER 0)
>>>>>> endif()
>>>>>>
>>>>>> and in the tools/CMakeLists.txt file we have this:
>>>>>>
>>>>>> if (LLDB_CAN_USE_LLDB_SERVER)
>>>>>> add_subdirectory(lldb-server)
>>>>>> endif()
>>>>>>
>>>>>>
>>>>>> Any ideas?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> --
>>>>>> Eran Ifrah,
>>>>>> Author of
>>>>>> CodeLite
>>>>>> , a cross platform open source C/C++ IDE: http://www.codelite.org
>>>>>> CodeLite IDE Blog: http://codeliteide.blogspot.com/
>>>>>> _______________________________________________
>>>>>> lldb-dev mailing list
>>>>>> lldb-dev at lists.llvm.org
>>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Eran Ifrah,
>>>> Author of codelite, a cross platform open source C/C++ IDE:
>>>> http://www.codelite.org
>>>> CodeLite IDE Blog: http://codeliteide.blogspot.com/
>>>>
>>>
>>
>>
>> --
>> Eran Ifrah,
>> Author of codelite, a cross platform open source C/C++ IDE:
>> http://www.codelite.org
>> CodeLite IDE Blog: http://codeliteide.blogspot.com/
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20160328/30bba182/attachment-0001.html>
More information about the lldb-dev
mailing list