[RFD] kconfig - introduce cond-source

[Sam Ravnborg]

Hi Roman.

In a couple of cases I have had the need to include a Kconfig file only
if present.
The current 'source' directive works as one would expect. It bails out
if the file is missing.

Examples where I have missed cond-source:
- klibc work
- external modules

        Sam

Patch below implement a cond-source.


diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -39,6 +39,7 @@ void zconf_starthelp(void);
 FILE *zconf_fopen(const char *name);
 void zconf_initscan(const char *name);
 void zconf_nextfile(const char *name);
+void zconf_try_nextfile(const char *name);
 int zconf_lineno(void);
 char *zconf_curname(void);
 
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/zconf.l
@@ -91,6 +91,7 @@ n     [A-Za-z0-9_]
        "mainmenu"              BEGIN(PARAM); return T_MAINMENU;
        "menu"                  BEGIN(PARAM); return T_MENU;
        "endmenu"               BEGIN(PARAM); return T_ENDMENU;
+       "cond-source"           BEGIN(PARAM); return T_CONDSOURCE;
        "source"                BEGIN(PARAM); return T_SOURCE;
        "choice"                BEGIN(PARAM); return T_CHOICE;
        "endchoice"             BEGIN(PARAM); return T_ENDCHOICE;
@@ -299,18 +300,14 @@ void zconf_initscan(const char *name)
        current_file->flags = FILE_BUSY;
 }
 
-void zconf_nextfile(const char *name)
+static void zconf_switch_buffer(const char *name, FILE *filp)
 {
        struct file *file = file_lookup(name);
        struct buffer *buf = malloc(sizeof(*buf));
        memset(buf, 0, sizeof(*buf));
 
        current_buf->state = YY_CURRENT_BUFFER;
-       yyin = zconf_fopen(name);
-       if (!yyin) {
-               printf("%s:%d: can't open file \"%s\"\n", zconf_curname(), 
zconf_lineno(), name);
-               exit(1);
-       }
+       yyin = filp;
        yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
        buf->parent = current_buf;
        current_buf = buf;
@@ -329,6 +326,27 @@ void zconf_nextfile(const char *name)
        current_file = file;
 }
 
+void zconf_nextfile(const char *name)
+{
+       FILE *filp;
+
+       filp = zconf_fopen(name);
+       if (!filp) {
+               printf("%s:%d: can't open file \"%s\"\n", zconf_curname(), 
zconf_lineno(), name);
+               exit(1);
+       }
+       zconf_switch_buffer(name, filp);
+}
+
+void zconf_try_nextfile(const char *name)
+{
+       FILE *filp;
+
+       filp = zconf_fopen(name);
+       if (filp)
+               zconf_switch_buffer(name, filp);
+}
+
 static struct buffer *zconf_endfile(void)
 {
        struct buffer *parent;

diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -44,6 +44,7 @@ static struct menu *current_menu, *curre
 %token T_MENU
 %token T_ENDMENU
 %token T_SOURCE
+%token T_CONDSOURCE
 %token T_CHOICE
 %token T_ENDCHOICE
 %token T_COMMENT
@@ -378,15 +379,22 @@ menu_block:
 
 source: T_SOURCE prompt T_EOL
 {
-       $$ = $2;
        printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), 
zconf_lineno(), $2);
+       zconf_nextfile($2);
 };
 
-source_stmt: source
+condsource: T_CONDSOURCE prompt T_EOL
 {
-       zconf_nextfile($1);
+       printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), 
zconf_lineno(), $2);
+       zconf_try_nextfile($2);
 };
 
+source_stmt:
+         source
+       | condsource
+       /* empty */
+;
+
 /* comment entry */
 
 comment: T_COMMENT prompt T_EOL
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/