The patch changes the Go frontend to not export function descriptors for unexported names. They aren't needed, and could potentially cause unlikely symbol name collisions. Also, the runtime package's reference to main could cause the runtime package to define main.main..f, which could also be defined in the main package if it does something like fmt.Print(main). That will normally work but will fail with a multiple symbol definition error when using -static-libgo. Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu. Committed to mainline.
Ian
Index: gcc/go/gofrontend/MERGE =================================================================== --- gcc/go/gofrontend/MERGE (revision 257600) +++ gcc/go/gofrontend/MERGE (working copy) @@ -1,4 +1,4 @@ -7998e29eec43ede1cee925d87eef0b09da67d90b +5d5ea2fd05dbf369ccc53c93d4846623cdea0c47 The first line of this file holds the git revision number of the last merge done from the gofrontend repository. Index: gcc/go/gofrontend/expressions.cc =================================================================== --- gcc/go/gofrontend/expressions.cc (revision 257527) +++ gcc/go/gofrontend/expressions.cc (working copy) @@ -1330,9 +1330,24 @@ Func_descriptor_expression::do_get_backe else { Location bloc = Linemap::predeclared_location(); + + // The runtime package has hash/equality functions that are + // referenced by type descriptors outside of the runtime, so the + // function descriptors must be visible even though they are not + // exported. + bool is_exported_runtime = false; + if (gogo->compiling_runtime() + && gogo->package_name() == "runtime" + && (no->name().find("hash") != std::string::npos + || no->name().find("equal") != std::string::npos)) + is_exported_runtime = true; + bool is_hidden = ((no->is_function() && no->func_value()->enclosing() != NULL) + || (Gogo::is_hidden_name(no->name()) + && !is_exported_runtime) || Gogo::is_thunk(no)); + bvar = context->backend()->immutable_struct(var_name, asm_name, is_hidden, false, btype, bloc);