FeatureFlagExpression

FeatureFlagExpression

[Frank.Orr]

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 ?

Thanks,.....Frank

Re: FeatureFlagExpression

[Laszlo Ersek]

On 08/23/17 01:21, Frank.Orr@dell.com 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

Re: FeatureFlagExpression

[Gao, Liming]

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

Thanks
Liming
>-----Original Message-----
>From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
>Laszlo Ersek
>Sent: Wednesday, August 23, 2017 7:55 AM
>To: Frank.Orr@dell.com; edk2-devel@lists.01.org
>Subject: Re: [edk2] FeatureFlagExpression
>
>On 08/23/17 01:21, Frank.Orr@dell.com 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
>_______________________________________________
>edk2-devel mailing list
>edk2-devel@lists.01.org
>https://lists.01.org/mailman/listinfo/edk2-devel