Hi,<br /><br />I am super new to EDK2 development so excuse my ignorance.&nbsp; While browsing the code base I find a lot places where the keyword "NULL" is used in place of a LibraryClass, specifically in DSC files.&nbsp; For example,<br /><br />
<div>in edk2/UefiPayloadPkg/UefiPayloadPkgIa32.dsc:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</div>
<div>&nbsp; MdeModulePkg/Core/Dxe/DxeMain.inf {</div>
<div>&nbsp; &nbsp; &lt;LibraryClasses&gt;</div>
<div>&nbsp; &nbsp; &nbsp; NULL|MdeModulePkg/Library/LzmaCustomDecompressLib/LzmaCustomDecompressLib.inf</div>
<div>&nbsp; }<br /><br />What does this mean?&nbsp; Does it mean that the&nbsp;LzmaCustomDecompressLib.inf library instance is unconditionally linked for this package?</div>