Optional reinstatement of old plugin machinery in PW and CP
Old plugin machinery was removed in qe-7.1, but as it still needed by some external packages
it has been possible to reinstate it using the __LEGACY_PLUGINS
compile definition.
We have added options in the build tools for defining this macro automatically
- In Autoconf with the option
--enable-legacy plugins
e.g.
./configure --enable-legacy-plugins
- in CMake using the existing QE_ENABLE_PLUGIN option. e.g.
cmake ../q-e -DQE_ENABLE_PLUGINS=legacy