On 11/8/2013 4:19 PM, Alexander Neundorf wrote: > On Friday 08 November 2013, Daniele E. Domenichelli wrote: >> So it looks like that "set(FOO "" PARENT_SCOPE)" instead of setting an >> empty FOO value, unsets it in the parent scope, and the behaviour is >> definitely different from set for the current scope. > > How about adding one new policy "modify handling of empty variables" which is > used by both ?
At most the policy should affect PARENT_SCOPE. One can see the difference right in cmSetCommand, where parentScope was added: http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=fc8ce174#patch6 For parentScope it does if (value.empty()) { this->Makefile->RaiseScope(variable, 0); } else { this->Makefile->RaiseScope(variable, value.c_str()); } while for normal scope it does just this->Makefile->AddDefinition(variable, value.c_str()); -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
