rjmccall added a comment. In https://reviews.llvm.org/D44985#1050674, @yaxunl wrote:
> In https://reviews.llvm.org/D44985#1050670, @rjmccall wrote: > > > What exactly are you trying to express here? Are you just trying to make > > these external declarations when compiling for the device because > > `__shared__` variables are actually defined on the host? That should be > > handled by the frontend by setting up the AST so that these declarations > > are not definitions. > > > No. These variables are not like external symbols defined on the host. They > behave like global variables in the kernel code but never initialized. > Currently no targets are able to initialize them and it is users' > responsibility to initialize them explicitly. > > Giving them an initial value will cause error in some backends since they > cannot handle them, therefore put undef as initializer. So undef is being used as a special marker to the backends that it's okay not to try to initialize these variables? https://reviews.llvm.org/D44985 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
