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Clang recently added '-fms-anonymous-structs' [1] to specifically enable the Microsoft tagged anonymous structure / union extension, for which the kernel added '-fms-extensions' in commitc4781dc3d1("Kbuild: enable -fms-extensions"). Switch to this more narrow option if it is available, which would have helped avoid the issue addressed by commita6773e6932("jfs: Rename _inline to avoid conflict with clang's '-fms-extensions'"). GCC has talked about adding a similar flag [2] as well but potentially naming it differently. Move the selection of the flag to Kconfig to make it easier to use cc-option (as CC_FLAGS_DIALECT may be used in arch Makefiles, which may be too early for cc-option in Kbuild) and customize based on compiler flag names. Link:c391efe6fb[1] Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123623 [2] Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nicolas Schier <nsc@kernel.org> Reviewed-by: Kees Cook <kees@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Helge Deller <deller@gmx.de> # parisc Link: https://patch.msgid.link/20260223-fms-anonymous-structs-v1-2-8ee406d3c36c@kernel.org Signed-off-by: Nicolas Schier <nsc@kernel.org>