This patch is not intended for the mainline.
I created this patch for Stephen Rothwell to resolve the merge
conflicts in linux-next 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>
---
Changes for v3:
- simplify the code
Changes for v2:
- Fix memory leak for *val == 'n' case.
scripts/kconfig/confdata.c | 41 ++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 9ece2f3b61a6..f432d9b3a4c6 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 +753,38 @@ 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);
+
+ if (sym->type == S_BOOLEAN || sym->type == S_TRISTATE) {
+ if (*val == 'n')
+ return;
+
+ /*
+ * 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);
+ }
+
+ escaped = escape_string_value(val);
+ 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 +1164,12 @@ 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
