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kconfig: add 'info', 'warning-if', and 'error-if' built-in functions

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Syntax:
  $(info,<text>)
  $(warning-if,<condition>,<text>)
  $(error-if,<condition>,<text)

The 'info' function prints a message to stdout as in Make.

The 'warning-if' and 'error-if' are similar to 'warning' and 'error'
in Make, but take the condition parameter.  They are effective only
when the <condition> part is y.

Kconfig does not implement the lazy expansion as used in the 'if'
'and, 'or' functions in Make.  In other words, Kconfig does not
support conditional expansion.  The unconditional 'error' function
would always terminate the parsing, hence would be useless in Kconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Masahiro Yamada 2018-05-28 18:21:53 +09:00
parent 82bc8bd82e
commit 1d6272e6fe
1 changed files with 27 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

27
scripts/kconfig/preprocess.c
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@ -106,6 +106,21 @@ struct function {
char *(*func)(int argc, char *argv[]); char *(*func)(int argc, char *argv[]);
}; };
static char *do_error_if(int argc, char *argv[])
{
if (!strcmp(argv[0], "y"))
pperror("%s", argv[1]);
return NULL;
}
static char *do_info(int argc, char *argv[])
{
printf("%s\n", argv[0]);
return xstrdup("");
}
static char *do_shell(int argc, char *argv[]) static char *do_shell(int argc, char *argv[])
{ {
FILE *p; FILE *p;
@ -146,9 +161,21 @@ static char *do_shell(int argc, char *argv[])
return xstrdup(buf); return xstrdup(buf);
} }
static char *do_warning_if(int argc, char *argv[])
{
if (!strcmp(argv[0], "y"))
fprintf(stderr, "%s:%d: %s\n",
current_file->name, yylineno, argv[1]);
return xstrdup("");
}
static const struct function function_table[] = { static const struct function function_table[] = {
/* Name MIN MAX Function */ /* Name MIN MAX Function */
{ "error-if", 2, 2, do_error_if },
{ "info", 1, 1, do_info },
{ "shell", 1, 1, do_shell }, { "shell", 1, 1, do_shell },
{ "warning-if", 2, 2, do_warning_if },
}; };
#define FUNCTION_MAX_ARGS 16 #define FUNCTION_MAX_ARGS 16