https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124565
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <[email protected]>: https://gcc.gnu.org/g:cc31d36025358599eb1c899b5c3b902920785f8f commit r16-8173-gcc31d36025358599eb1c899b5c3b902920785f8f Author: Jakub Jelinek <[email protected]> Date: Thu Mar 19 15:49:51 2026 +0100 alpha: Set TREE_PUBLIC on TYPE_NAME of __va_list_tag [PR124565] module; #include <cstdarg> export module pr124565; export namespace std { using std::va_list; } fails on alpha-linux with -fmodules: pr124565.cc:5:14: error: exporting âtypedef __gnuc_va_list va_listâ that does not have external linkage <built-in>: note: âtypedef struct __va_list_tag __va_list_tagâ declared here with internal linkage It doesn't fail on x86_64-linux because there va_list is __va_list_tag[] (i.e. array type), while on alpha-linux it is __va_list_tag itself; and the module code calls decl_linkage on it and returns lk_internal for C++11 and later. As I have no way to test this on alpha, I've just bootstrapped/regtested similar change (just posted) on x86_64-linux and verified on the above testcase that it fixes the problem in a cross to alpha-linux. Not adding a testcase as any test which tries to compile bits/std.cc should already catch it. 2026-03-19 Jakub Jelinek <[email protected]> PR target/124565 * config/alpha/alpha.cc (alpha_build_builtin_va_list): Set TREE_PUBLIC on type_decl.
