After building with gradle, the MANIFEST.MF file for e.g. solr-core.jar containst
While when building with ant, it says
Ant-Version: Apache Ant 1.10.7
Created-By: 11.0.6+10 (AdoptOpenJDK)
Specification-Title: Apache Solr Search Server: solr-core
Specification-Vendor: The Apache Software Foundation
Implementation-Version: 9.0.0-SNAPSHOT 9b5542ad55da601e0bdfda96bad8c2c
cabbbc397 - janhoy - 2020-04-01 16:24:09
Implementation-Vendor: The Apache Software Foundation
In addition, with ant, the META-INF folder also contains LICENSE.txt and NOTICE.txt files.
There is a macro build-manifest in common-build.xml that seems to build the manifest.
The effect of this is e.g. that spec an implementation versions do not show in Solr Admin UI