Preprocessor dynamic environment variable support

[wixbot]

The preprocessor can read all static environment variables (%SystemDrive%, ...), but lacks support of the dynamic ones (%DATE%, ...). Compiling

<Property Id="BuildDate" Value="$(env.DATE)" />

results in

CNDL0150: Undefined preprocessor variable '$(env.DATE)'.

For the time being, the best workaround is to implement a custom preprocessor extension (see accepted answer to this stackoverflow question), but it would be great if the preprocessor would support dynamic environment variables from scratch.

Originally opened by hannes

[wixbot]

cmd.exe provides "fake" variables that aren't actually OS environment variables. WiX cannot support those fake variables.

Originally posted by barnson
Resolution set to wontfix
Status changed from Untriaged to Resolved