linux-kernel - [RFC/PATCH] kconfig: autogenerated is_config

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Date:	Tue,  5 Apr 2011 07:41:23 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	linux-kbuild@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: [RFC/PATCH] kconfig: autogenerated is_config_xxx macro

this will allow to use to use

	if(is_config_xxx())

in the code instead of

	#ifdef CONFIG_xxx

and now let the compiler remove the non usefull code and not the
pre-processor

as done in the mach-types for arm as exmaple

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
---
 scripts/kconfig/confdata.c |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 61c35bf..5ea8739 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -778,6 +778,28 @@ out:
 	return res;
 }
 
+static void conf_write_function_autoconf(FILE *out, char* conf, char* name, int val)
+{
+	char c;
+	char *tmp, *d;
+
+	*d = strdup(conf);
+	tmp = d;
+	while ((c = *conf++)) {
+		*d++ = tolower(c);
+	}
+	fprintf(out, "#define is_%s", tmp);
+	free(tmp);
+
+	d = strdup(name);
+	tmp = d;
+	while ((c = *name++)) {
+		*d++ = tolower(c);
+	}
+	fprintf(out, "%s() %d\n", tmp, val);
+	free(tmp);
+}
+
 int conf_write_autoconf(void)
 {
 	struct symbol *sym;
@@ -786,6 +808,7 @@ int conf_write_autoconf(void)
 	FILE *out, *tristate, *out_h;
 	time_t now;
 	int i;
+	int fct_val;
 
 	sym_clear_all_valid();
 
@@ -829,6 +852,7 @@ int conf_write_autoconf(void)
 		       rootmenu.prompt->text, ctime(&now));
 
 	for_all_symbols(i, sym) {
+		fct_val = 1;
 		sym_calc_value(sym);
 		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 			continue;
@@ -842,6 +866,7 @@ int conf_write_autoconf(void)
 		case S_TRISTATE:
 			switch (sym_get_tristate_value(sym)) {
 			case no:
+				fct_val = 0;
 				break;
 			case mod:
 				fprintf(tristate, "%s%s=M\n",
@@ -874,8 +899,10 @@ int conf_write_autoconf(void)
 			    CONFIG_, sym->name, str);
 			break;
 		default:
+			fct_val = 0;
 			break;
 		}
+		conf_write_function_autoconf(out_h, CONFIG_, sym->name, fct_val);
 	}
 	fclose(out);
 	fclose(tristate);
-- 
1.7.4.1

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