build: define RTC_SUPPORT as a bool

Currently, RTC_SUPPORT is defined as a tristate, with 'depends on m',
which is supposed to only let it be set to 'm' or 'n'.  However,
scripts/target-metadata.pl will 'select' it, or setting it to 'y', which
defeats it's 'depends on m' restriction.  The users of the symbol are
not expecting it to be necessarily 'm' either, so we can safely use it
as bool.

Newer versions of Linux 'conf' will issue a warning when it detects such
unmet dependencies, and will set it to 'n' instead of 'y', as the
current version does.  In all cases, 'm' is never used.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

diff --git a/target/Config.in b/target/Config.in
index 3ee23ebf7f06a9637a3adc770a8e79008f384437..9fead5994f709663dc6f86d487a20469289c5686 100644 (file)
--- a/target/Config.in
+++ b/target/Config.in
@@ -37,8 +37,7 @@ config USB_GADGET_SUPPORT
        bool
 
 config RTC_SUPPORT
-       tristate
-       depends on m
+       bool
 
 config BIG_ENDIAN
        bool