On 05/13/2012 05:50 PM, Stephen Kelly wrote: > The remaining (I think) open question regards what form the generator > expressions should take so that they can represent multiple dimensions.
Multiple dimensions will inevitably need to be combined in arbitrary boolean expressions. I'm concerned that this will lead to a whole new piece to the language that will be hard to get right without knowledge of future use cases. We will need to ensure that parsing of generator expressions is *very* strict so we can extend the syntax easily later. Perhaps the simplest thing to do is implement something like the normal CMake IF() command in generator expressions. Factor the IF() expression evaluation out for re-use. Teach the generator expression parser to extract the IF() part (with nested $<> expressions already evaluated, something the generator expression evaluator already knows how to do) and pass it through the IF() evaluator. For example: "$<IF($<CONFIGURATION> MATCHES Debug AND $<LANGUAGE> STREQUALS CXX)...>" I'm not sure what should go in the "..." part though. Some syntax to delimit the then/else values would be needed. Also the MATCHES test is not case-insensitive, and the whole thing is quite verbose. Ideas welcome. -Brad -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
