Frank:
  This is unsupported feature. Now, FeatureFlagExpression is ignored. 

Thanks
Liming
>-----Original Message-----
>From: edk2-devel [mailto:[email protected]] On Behalf Of
>Laszlo Ersek
>Sent: Wednesday, August 23, 2017 7:55 AM
>To: [email protected]; [email protected]
>Subject: Re: [edk2] FeatureFlagExpression
>
>On 08/23/17 01:21, [email protected] wrote:
>> Dell - Internal Use - Confidential
>>
>>  I'm trying to use this feature as described in various edk2 documents with
>zero success.
>> For example, in the INF spec 1.25, the following is defined for the protocols
>section :
>>
>>
>>
>> The formats for entries in this section is:
>>
>> gEfiProtocolCName [ | FeatureFlagExpression] ## Usage comment
>>
>> When a FeatureFlagExpression is present, if the expression evaluates to
>TRUE, then the Protocal entry is valid. If the expression evaluates to FALSE,
>then the EDK II build tools must ignore the entry.
>>
>> The following is an example of the [Protocols] section.
>>
>> [Protocols]
>>
>> gEfiDecompressProtocolGuid
>>
>> gEfiLoadFileProtocolGuid
>>
>>
>> Does anyone have any examples showing the use of a
>FeatureFlagExpression ?
>
>See e.g. "MdePkg/Library/UefiLib/UefiLib.inf".
>
>Thanks
>Laszlo
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