[PATCH] kconfig: Warn if there is more than one help text

Ulf Magnusson
2018-01-12T06:48:09Z

Avoids mistakes like in the following real-world example, where only the
final help string ("Say Y...") was used. This particular example was
fixed in commit 561b29e4ec8d ("media: fix media Kconfig help syntax
issues").

config DVB_NETUP_UNIDVB
...
select DVB_CXD2841ER if MEDIA_SUBDRV_AUTOSELECT
---help---
Support for NetUP PCI express Universal DVB card.
help
Say Y when you want to support NetUP Dual Universal DVB card
...

This now prints the following warning:

drivers/media/pci/netup_unidvb:13: warning: 'DVB_NETUP_UNIDVB' defined with more than one help text -- only the last one will be used

Also free() any extra help strings.

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
---
scripts/kconfig/zconf.y | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index c1e4e82f56b5..06ef304ee325 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -435,6 +435,11 @@ help_start: T_HELP T_EOL

help: help_start T_HELPTEXT
{
+ if (current_entry->help) {
+ free(current_entry->help);
+ zconfprint("warning: '%s' defined with more than one help text -- only the last one will be used",
+ current_entry->sym->name ?: "<choice>");
+ }
current_entry->help = $2;
};

--
2.14.1