6.18-stable review patch. If anyone has any objections, please let me know.
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From: H. Peter Anvin hpa@zytor.com
commit 2fb6915fa22dc5524d704afba58a13305dd9f533 upstream.
"auto" was defined as a keyword back in the K&R days, but as a storage type specifier. No one ever used it, since it was and is the default storage type for local variables.
C++11 recycled the keyword to allow a type to be declared based on the type of an initializer. This was finally adopted into standard C in C23.
gcc and clang provide the "__auto_type" alias keyword as an extension for pre-C23, however, there is no reason to pollute the bulk of the source base with this temporary keyword; instead define "auto" as a macro unless the compiler is running in C23+ mode.
This macro is added in <linux/compiler_types.h> because that header is included in some of the tools headers, wheres <linux/compiler.h> is not as it has a bunch of very kernel-specific things in it.
[ Cc: stable to reduce potential backporting burden. ]
Signed-off-by: H. Peter Anvin (Intel) hpa@zytor.com Acked-by: Miguel Ojeda ojeda@kernel.org Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/compiler_types.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
--- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -14,6 +14,19 @@ #ifndef __ASSEMBLY__
/* + * C23 introduces "auto" as a standard way to define type-inferred + * variables, but "auto" has been a (useless) keyword even since K&R C, + * so it has always been "namespace reserved." + * + * Until at some future time we require C23 support, we need the gcc + * extension __auto_type, but there is no reason to put that elsewhere + * in the source code. + */ +#if __STDC_VERSION__ < 202311L +# define auto __auto_type +#endif + +/* * Skipped when running bindgen due to a libclang issue; * see https://github.com/rust-lang/rust-bindgen/issues/2244. */