On Wed, May 25, 2022 at 4:50 PM Ard Biesheuvel <a...@kernel.org> wrote:

> On Wed, 25 May 2022 at 17:08, Rebecca Cran <quic_rc...@quicinc.com> wrote:
> >
> > I noticed OvmfPkg/OvmfPkgX64.dsc doesn't build with `-t CLANG38 -b
> > NOOPT` (with clang version 14.0.2) with the latest edk2 master
> > (07c0c2eb0a5970db614ebce1060fc79d6904bdfd):
> >
> > make: Nothing to be done for 'tbuild'.
> > /usr/bin/ld: /usr/bin/ld: DWARF error: invalid or unhandled FORM value:
> > 0x23
> >
> /home/bcran/src/upstream/uefi/edk2/Build/OvmfX64/NOOPT_CLANG38/X64/OvmfPkg/VirtioGpuDxe/VirtioGpu/OUTPUT/VirtioGpuDxe.lib(Gop.obj):
> > in function `GopSetMode':
> > Gop.c:(.text.GopSetMode+0x418): undefined reference to `memcpy'
>
> Can you dump the object file to see where the memcpy() call is emitted?
>
I think I found the smoking gun:
https://github.com/tianocore/edk2/blob/916f90baa547b3ebef8fa87c530e2f0c8e35e1e3/OvmfPkg/VirtioGpuDxe/Gop.c#L512

>
>
> > Building ...
> > /home/bcran/src/upstream/uefi/edk2/OvmfPkg/PlatformPei/PlatformPei.inf
> > [X64]
> > clang-14.0: error: linker command failed with exit code 1 (use -v to see
> > invocation)
> > make: Nothing to be done for 'tbuild'.
> > make: *** [GNUmakefile:358:
> >
> /home/bcran/src/upstream/uefi/edk2/Build/OvmfX64/NOOPT_CLANG38/X64/OvmfPkg/VirtioGpuDxe/VirtioGpu/DEBUG/VirtioGpuDxe.dll]
> > Error 1
> >
> >
> > build.py...
> > : error 7000: Failed to execute command
> >         make tbuild
> >
> [/home/bcran/src/upstream/uefi/edk2/Build/OvmfX64/NOOPT_CLANG38/X64/OvmfPkg/VirtioGpuDxe/VirtioGpu]
> >
> >
> > build.py...
> > : error F002: Failed to build module
> >
>  /home/bcran/src/upstream/uefi/edk2/OvmfPkg/VirtioGpuDxe/VirtioGpu.inf
> [X64, CLANG38, NOOPT]
> >
> > - Failed -
> > Build end time: 09:03:38, May.25 2022
> > Build total time: 00:00:07
> >
> >
> > --
> > Rebecca Cran
>

A very clear issue I'm seeing (in tools_def) is that no GCC-like toolchains
pass -ffreestanding and that may be causing issues. I'll try to reproduce
it on my end and see if it's a bug in LLVM.

>
>
> 
>
>
>

-- 
Pedro Falcato


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