Re: [PATCH v2] EmulatorPkg/SmbiosLib: Declare the correct library class.

["Carsey, Jaben" <jaben.carsey@intel.com>]

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Marvin Häuser
> Sent: Thursday, May 24, 2018 1:57 PM
> To: edk2-devel@lists.01.org; Laszlo Ersek <lersek@redhat.com>
> Cc: Justen, Jordan L <jordan.l.justen@intel.com>; afish@apple.com
> Subject: Re: [edk2] [PATCH v2] EmulatorPkg/SmbiosLib: Declare the correct
> library class.
> 
> > -----Original Message-----
> > From: Laszlo Ersek <lersek@redhat.com>
> > Sent: Thursday, May 24, 2018 10:51 PM
> > To: Jordan Justen <jordan.l.justen@intel.com>; edk2-devel@lists.01.org;
> > Marvin Häuser <Marvin.Haeuser@outlook.com>
> > Cc: afish@apple.com
> > Subject: Re: [edk2] [PATCH v2] EmulatorPkg/SmbiosLib: Declare the correct
> > library class.
> >
> > On 05/24/18 22:36, Jordan Justen wrote:
> > > Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
> > >
> > > Pushed as 7dc7c7435e.
> > >
> > > On 2018-05-17 05:43:30, Marvin Häuser wrote:
> > >> Currently, SmbiosLib declares the PcdLib library class. Update the
> > >> declaration to declare SmbiosLib.
> > >>
> > >> V2:
> > >>   - Do not change the copyright date as requested.
> > >>
> > >> Contributed-under: TianoCore Contribution Agreement 1.1
> > >> Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
> > >> ---
> > >>  EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >> diff --git a/EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf
> > >> b/EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf
> > >> index adcd7ef08e20..36d5c350f51a 100644
> > >> --- a/EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf
> > >> +++ b/EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf
> > >> @@ -20,7 +20,7 @@ [Defines]
> > >>    FILE_GUID                      = 881863A2-09FD-3E44-8D62-7AE038D03747
> > >>    MODULE_TYPE                    = DXE_DRIVER
> > >>    VERSION_STRING                 = 1.0
> > >> -  LIBRARY_CLASS                  = PcdLib|DXE_CORE DXE_DRIVER
> > DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER SMM_CORE
> > UEFI_APPLICATION UEFI_DRIVER
> > >> +  LIBRARY_CLASS                  = SmbiosLib|DXE_CORE DXE_DRIVER
> > DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER SMM_CORE
> > UEFI_APPLICATION UEFI_DRIVER
> > >>
> > >>    CONSTRUCTOR                    = SmbiosLibConstructor
> >
> > (Just because I pondered the question a few days ago, independently, I'll
> > voice it here:)
> >
> > Should BaseTools catch this? "EmulatorPkg/EmulatorPkg.dsc" contains the
> > following library resolution:
> >
> >   SmbiosLib|EmulatorPkg/Library/SmbiosLib/SmbiosLib.inf
> >
> > I think it should be possible to flag that the class of the lib instance doesn't
> > match the lib class that the platform DSC is resolving.
> 
> I think it definitely should, there is no case (known to me) where those two
> values diverging would be a supported or making any sense.

There is a corner case: A single module with a single INF may satisfy 2 library class definitions and as such may have 2 lines.  As long as we flag instances where no LIBRARY_CLASS line in the INF matches the library class in the DSC, I think a warning or error would be valid.

> 
> >
> > (Or is Marvin's patch the result of such an error message already?)
> 
> No, I was just checking the library for reference and noticed the mistake. I
> did not actually build EmulatorPkg though.
> 
> Regards,
> Marvin
> 
> >
> > Thanks!
> > Laszlo
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