[Bug c/87334] New: RFE: Add '__builtin_ms_va_list' support to ARM64

[mike at cchtml dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87334

            Bug ID: 87334
           Summary: RFE: Add '__builtin_ms_va_list' support to ARM64
           Product: gcc
           Version: 8.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mike at cchtml dot com
  Target Milestone: ---

Wine 3.0.3 (and 3.8) introduced a change[1] to require the
'__builtin_ms_va_list' extension and when it is missing wine will compile with
clang. Clang 5.0 or higher is required for this extension and RHEL 7 ships
Clang 3. Wine no longer compiles on arm64 and RHEL 7.

RHEL 7 gcc: gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC)
Tested as missing on gcc 8.2.1 as well (Fedora Rawhide).

[1]
https://source.winehq.org/git/wine.git/commit/295359a17447d6ad487b6c652c3a98bbe17cee6e