Ah yes the ld -dead_strip flag. Thanks for the reminder.
Pike
________________________________
Van: Cameron Esfahani <[email protected]>
Aan: "[email protected]" <[email protected]>
Verzonden: woensdag 2 januari 3:30 2013
Onderwerp: Re: [edk2] How to conditionally exclude a library?
Pike, you should also remember that all the supported linkers will dead strip
any unused code. So if you conditionally remove any serial port code from your
C code, the library code will get dead stripped, NULL-implementation or not.
[email protected]
On Jan 1, 2013, at 17:57, Andrew Fish <[email protected]> wrote:
Pike,
>
>
>The [LibraryClasses] section implies that the driver consumes an API in the
>library. So you need to link an instance of the library. So in your serial
>example there is
>https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Library/BaseSerialPortLibNull/.
>
>
>
>So what you would expect to see in the DSC file for your platform is a mapping
>to a SerialPortLib that matches your platform. If the platform does not
>support a serial port you point to the Null version of the library, otherwise
>you point to a serial port lib for your platform.
>
>
>In general the idea is you just edit your platform DSC file to port your
>platform.
>
>Andrew Fish
>
>
>
>On Dec 31, 2012, at 9:29 PM, Piker Alpha <[email protected]> wrote:
>
>Is there a way to conditionally exclude libraries? Let's take this example:
>>
>>
>>[LibraryClasses]
>> PeimEntryPoint
>> PeiServicesLib
>> PcdLib
>> HobLib
>> SerialPortLib
>> ReportStatusCodeLib
>> PrintLib
>> DebugLib
>> BaseMemoryLib
>>
>>
>>What if I want to exclude one of the libraries? Say the SerialPortLib or
>>DebugLib.
>>
>>
>>Actually. I am rather surprised that there isn't a predefined/uniform way of
>>doing this. Especially since there is one (-D BUILD_FAT) for the FAT driver
>>(and no other drivers) but there are so many mother boards without a serial
>>port these days, yet no simple way to exclude it?
>>
>>
>>The only thing that I can come up with now is to copy/rename the file and
>>comment the target library out of it. Then use something like (example):
>>
>>
>>!if $(SERIAL_PORT_SUPPORT)
>> EmulatorPkg/Library/../original.inf
>>
>>!else
>> EmulatorPkg/Library/../oroginal-NoSerial.inf
>>
>>!endif
>>
>>
>>Which of course is rather cumbersome, and thus I hope that there is a better
>>way of doing this. Hopefully something I have missed. Thanks.
>>
>>
>>Pike------------------------------------------------------------------------------
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