On Mon, Jun 13, 2016 at 00:03:29 +0200, Daniel Pfeifer wrote: > Can you show an example? To be clear: We are looking for a function, > that has a code path for `str == NULL` and a *different* codepath for > `str[0] = '\0'`.
As input to functions? Usually NULL means "unset". See properties, variable values, etc. As an output, any place which doesn't care should already be using GetSafeDefinition(). As a concrete example, `set(CACHE)` cares about NULL versus *s == NULL: const char* existingValue = state->GetCacheEntryValue(variable); if (existingValue && (state->GetCacheEntryType(variable) != cmState::UNINITIALIZED)) { // if the set is trying to CACHE the value but the value // is already in the cache and the type is not internal // then leave now without setting any definitions in the cache // or the makefile if (cache && type != cmState::INTERNAL && !force) { return true; } } // if it is meant to be in the cache then define it in the cache if (cache) { this->Makefile->AddCacheDefinition(variable, value.c_str(), docstring, type, force); } else { // add the definition this->Makefile->AddDefinition(variable, value.c_str()); } --Ben -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers