Hi all,
There is going to be a sweeping change in how the I/O streams are
used. We'll no longer be using std::cout, std::cerr, std::cin, etc.
in each file. Instead, new LLVM streams will be used. The reason for
this is because each "#include <iostream>" introduces an
overhead in
each compilation unit due to it needing to make sure that all of the
std::c* streams are constructed first. This is a terrible waste of
resources and one which we can do without.
The changes should be pretty transparent. There may be a few places
which need a hack to support sstreams. This will be solved in the
future.
Here's what the changes are:
Old Way New Way
------- -------
#include <iostream> #include "llvm/Support/Streams.h"
or
class llvm_ostream; // forward declaration
std::cout llvm_cout
std::cerr llvm_cerr
std::cin llvm_cin
DEBUG(std::cerr << "foo"); DOUT << "foo";
The changes are going to be gradual. I'll be checking them in over
the next week. I'll send out more information about changes in the
future.
-bw
