On Fri, Oct 01, 2021 at 02:32:53PM +0900, Masahiro Yamada wrote:
> This patch is not intended for the mainline.
>
> I created this patch for Stephen Rothwell to resolve the merge
> conflicts more easily.
>
> The Rust tree is touching scripts/kconfig/confdata.c to generate
> include/generated/rustc_cfg, which would cause complicated conflicts
> with changes from the kbuild tree.
>
> I re-implemented it to produce the equaivalent rustc_cfg.
>
> I also fixed the memory leak; the original code from the Rust tree
> did not free the malloc'ed pointer.
>
> Stephen:
> When you resolve the conflicts in confdata.c, please take this one.
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
>
> scripts/kconfig/confdata.c | 42 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index 9ece2f3b61a6..4767f3810cf4 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -603,6 +603,9 @@ static const struct comment_style comment_style_c = {
>
> static void conf_write_heading(FILE *fp, const struct comment_style *cs)
> {
> + if (!cs) /* no heading for rustc_cfg? */
> + return;
> +
> fprintf(fp, "%s\n", cs->comment_block_begin);
>
> fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
> @@ -750,6 +753,39 @@ static void print_symbol_for_c(FILE *fp, struct symbol *sym)
> free(escaped);
> }
>
> +/* rustc configuration */
> +static void print_symbol_for_rustc_cfg(FILE *fp, struct symbol *sym)
> +{
> + const char *val;
> + char *escaped;
> +
> + if (sym->type == S_UNKNOWN)
> + return;
> +
> + val = sym_get_string_value(sym);
> + escaped = escape_string_value(val);
> +
> + if (sym->type == S_BOOLEAN || sym->type == S_TRISTATE) {
> + if (*val == 'n')
> + return;
I'd expect a "free(escaped);" here.
> +
> + /*
> + * To have similar functionality to the C macro `IS_ENABLED()`
> + * we provide an empty `--cfg CONFIG_X` here in both `y`
> + * and `m` cases.
> + *
> + * Then, the common `fprintf()` below will also give us
> + * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
> + * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
> + */
> + fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
> + }
> +
> + fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, escaped);
> +
> + free(escaped);
> +}
> +
> /*
> * Write out a minimal config.
> * All values that has default values are skipped as this is redundant.
> @@ -1129,6 +1165,12 @@ int conf_write_autoconf(int overwrite)
> if (ret)
> return ret;
>
> + ret = __conf_write_autoconf("include/generated/rustc_cfg",
> + print_symbol_for_rustc_cfg,
> + NULL);
> + if (ret)
> + return ret;
> +
> /*
> * Create include/config/auto.conf. This must be the last step because
> * Kbuild has a dependency on auto.conf and this marks the successful
> --
> 2.30.2
>
