On Tue, May 21, 2019 at 01:41:06PM +0000, Adham Masarwah wrote:
> >
> > >From: Bruce Richardson <bruce.richard...@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%7Cd44c2914a2104176185008d6ddf39932%7Ca652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636940435668687736&sdata=%2BXND%2Be8KTPd6CBligMrSlJzsV%2BrrxnHKjQvcClwpNDk%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
> Yes, the clang-cl compiler (like msvc) does not offer the flags we need to
> control the exact output microarchitecture. It also uses completely different
> flag formats for things like warnings etc, which is why we need to use clang
> instead.
>
> /Bruce
In this case we should find a solution to open the debug ability since we will
need it for sure.
What can be done, who can help causing clang generates good files ?
