linux-kernel - [PATCH v4 15/31] kconfig: add 'info', 'warning', and 'error' built-in functions

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Date:   Thu, 17 May 2018 15:16:54 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        linux-kernel@...r.kernel.org, Nicholas Piggin <npiggin@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>, x86@...nel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH v4 15/31] kconfig: add 'info', 'warning', and 'error' built-in functions

Add 'info', 'warning', and 'error' functions as in Make.

They print messages during parsing Kconfig files. 'error' will be
useful to terminate the parsing immediately in fatal cases.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v4:
  - Add 'error' function

Changes in v3: None
Changes in v2: None

 scripts/kconfig/preprocess.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c
index 47b32dc..591bcf7 100644
--- a/scripts/kconfig/preprocess.c
+++ b/scripts/kconfig/preprocess.c
@@ -104,6 +104,20 @@ struct function {
 	char *(*func)(int argc, char *argv[], int old_argc, char *old_argv[]);
 };
 
+static char *do_error(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+	pperror("%s", argv[0]);
+
+	return NULL;
+}
+
+static char *do_info(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+	printf("%s\n", argv[0]);
+
+	return xstrdup("");
+}
+
 static char *do_shell(int argc, char *argv[], int old_argc, char *old_argv[])
 {
 	FILE *p;
@@ -144,9 +158,19 @@ static char *do_shell(int argc, char *argv[], int old_argc, char *old_argv[])
 	return xstrdup(buf);
 }
 
+static char *do_warning(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+	fprintf(stderr, "%s:%d: %s\n", current_file->name, yylineno, argv[0]);
+
+	return xstrdup("");
+}
+
 static const struct function function_table[] = {
 	/* Name		MIN	MAX	EXP?	Function */
+	{ "error",	1,	1,	true,	do_error },
+	{ "info",	1,	1,	true,	do_info },
 	{ "shell",	1,	1,	true,	do_shell },
+	{ "warning",	1,	1,	true,	do_warning },
 };
 
 #define FUNCTION_MAX_ARGS		16
-- 
2.7.4