[dpdk-dev] Generating Debug information in Windows using Clang (PDB files)

Adham Masarwah adham at mellanox.com
Tue May 21 15:41:06 CEST 2019


>From: Bruce Richardson <bruce.richardson at intel.com> 
>Sent: Tuesday, May 21, 2019 11:22 AM
>
>On Mon, May 20, 2019 at 07:02:22PM +0100, Menon, Ranjit wrote:
>>    Adham…
>> 
>>    I don’t think we debugged using clang compiled code for Hello world –
>>    mainly because it was only a “helloworld” application and we didn’t
>>    quite need any debugging!:-)
>> 
>> 
>>    I found this link:
>>    [1]https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.llvm.org%2F2017%2F08%2Fllvm-on-windows-now-supports-pdb-debug&data=02%7C01%7Cadham%40mellanox.com%7Cea97cb9cae684d72bbed08d6ddc57192%7Ca652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636940237422999520&sdata=2PxSjEyx%2BXatdDKMtVcXFlWQ5jnBM9nK2782jnRg1BA%3D&reserved=0.
>>    html
>> 
>>    …which says to use the following:
>> 
>>     Here are two simple ways to test out this new functionality:
>>     1. Have clang-cl invoke lld automatically
>> 
>>         clang-cl -fuse-ld=lld -Z7 -MTd hello.cpp
>>     2. Invoke clang-cl and lld separately.
>> 
>>    clang-cl -c -Z7 -MTd -o hello.obj hello.cpp
>> 
>>    lld-link -debug hello.obj
>> 
>>    Can you try it with just the -Z7 option?
>> 
>> 
>>    I’m also adding some persons from Microsoft to this thread, hoping they
>>    can help…
>> 
>> 
>>    +Harini +Omar +Jeffrey
>> 
>> 
>>    ranjit m.
>> 
>Part of the issue may be that we use clang, rather than clang-cl on windows.
>
>/Bruce

I did a small test to check clang vs clang-cl, the compiled binary and the PDB file from the Clang-cl seems working fine in WinDbg.
The problem we have that the meson.build files are not compatible with clang-cl, and the meson build command is failing.
This is the first error:
config\x86\meson.build:23:1: ERROR: Problem encountered: SSE4.2 instruction set is required for DPDK.
Please set the machine type to "nehalem" or "corei7" or higher value

/Adham


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