@@ -111,6 +111,32 @@ static char *do_error(int argc, char *argv[], int old_argc, char *old_argv[])
return NULL;
}
+static char *do_if(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+ char *cond, *p, *res;
+ const char *sel;
+
+ cond = expand_string_with_args(argv[0], old_argc, old_argv);
+ p = cond;
+
+ /* condition is true if any character except whitespaces is contained */
+ while (*p == ' ' || *p == '\t')
+ p++;
+
+ if (*p)
+ sel = argv[1];
+ else if (argc >= 3)
+ sel = argv[2];
+ else
+ sel = "";
+
+ res = expand_string_with_args(sel, old_argc, old_argv);
+
+ free(cond);
+
+ return res;
+}
+
static char *do_info(int argc, char *argv[], int old_argc, char *old_argv[])
{
printf("%s\n", argv[0]);
@@ -168,6 +194,7 @@ static char *do_warning(int argc, char *argv[], int old_argc, char *old_argv[])
static const struct function function_table[] = {
/* Name MIN MAX EXP? Function */
{ "error", 1, 1, true, do_error },
+ { "if", 2, 3, false, do_if },
{ "info", 1, 1, true, do_info },
{ "shell", 1, 1, true, do_shell },
{ "warning", 1, 1, true, do_warning },
The 'if' function is invoked in the form: $(if,condition,then-part,else-part) The behavior is slightly different from that of Make. In Make, the condition is true if the expansion contains any characters (even space). That is why we sometimes need $(strip ...) in the condition part. I thought it was a nasty part in Make, so I changed it for Kconfig; the condition is true if the expansion contains any characters except whitespaces. Unlike the other functions, the parameters passed to 'if' are lazily expanded. The then-part is expanded only when the condition true, and the else-part when false. If the parameters were evaluated before passed to the 'if' function, $(if,$(cond),$(error,...)) would terminate the parsing regardless of $(cond). Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> --- Changes in v4: - Newly added Changes in v3: None Changes in v2: None scripts/kconfig/preprocess.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) -- 2.7.4