On Mon, Apr 8, 2024 at 4:18 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
>
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> Starting with c23, 'constexpr' is a keyword in C like in C++ and cannot
> be used as an identifier:
>
> scripts/unifdef.c:206:25: error: 'constexpr' can only be used in variable declarations
> 206 | static bool constexpr; /* constant #if expression */
> | ^
> scripts/unifdef.c:880:13: error: expected identifier or '('
> 880 | constexpr = false;
> | ^
>
> Rename this instance to allow changing to C23 at some point in the future.
>
> Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
> Cc: Nicolas Schier <nicolas@xxxxxxxxx>
> Cc: linux-kbuild@xxxxxxxxxxxxxxx
> Reviewed-By: Tony Finch <dot@xxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> v2: include fixup from Tony
Applied to linux-kbuild. Thanks.
> ---
> scripts/unifdef.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/scripts/unifdef.c b/scripts/unifdef.c
> index db00e3e30a59..ff15efd6e7d7 100644
> --- a/scripts/unifdef.c
> +++ b/scripts/unifdef.c
> @@ -203,7 +203,7 @@ static int depth; /* current #if nesting */
> static int delcount; /* count of deleted lines */
> static unsigned blankcount; /* count of blank lines */
> static unsigned blankmax; /* maximum recent blankcount */
> -static bool constexpr; /* constant #if expression */
> +static bool constexpression; /* constant #if expression */
> static bool zerosyms = true; /* to format symdepth output */
> static bool firstsym; /* ditto */
>
> @@ -819,7 +819,7 @@ static const struct ops {
> /*
> * Function for evaluating the innermost parts of expressions,
> * viz. !expr (expr) number defined(symbol) symbol
> - * We reset the constexpr flag in the last two cases.
> + * We reset the constexpression flag in the last two cases.
> */
> static Linetype
> eval_unary(const struct ops *ops, int *valp, const char **cpp)
> @@ -877,7 +877,7 @@ eval_unary(const struct ops *ops, int *valp, const char **cpp)
> cp = skipcomment(cp);
> if (defparen && *cp++ != ')')
> return (LT_ERROR);
> - constexpr = false;
> + constexpression = false;
> } else if (!endsym(*cp)) {
> debug("eval%d symbol", ops - eval_ops);
> sym = findsym(cp);
> @@ -895,7 +895,7 @@ eval_unary(const struct ops *ops, int *valp, const char **cpp)
> lt = *valp ? LT_TRUE : LT_FALSE;
> cp = skipargs(cp);
> }
> - constexpr = false;
> + constexpression = false;
> } else {
> debug("eval%d bad expr", ops - eval_ops);
> return (LT_ERROR);
> @@ -955,10 +955,10 @@ ifeval(const char **cpp)
> int val = 0;
>
> debug("eval %s", *cpp);
> - constexpr = killconsts ? false : true;
> + constexpression = killconsts ? false : true;
> ret = eval_table(eval_ops, &val, cpp);
> debug("eval = %d", val);
> - return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
> + return (constexpression ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
> }
>
> /*
> --
> 2.39.2
>
--
Best Regards
Masahiro Yamada
