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authorPaul Gortmaker <paul.gortmaker@windriver.com>2012-04-12 19:46:32 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-12 18:35:58 -0700
commit69349c2dc01c489eccaa4c472542c08e370c6d7e (patch)
tree2422ef07a511d51714e0e16da1ac65c7256e9add /scripts
parent7c427f45503f77f148cc2b66864e0684c60fa3a0 (diff)
kconfig: fix IS_ENABLED to not require all options to be defined
Using IS_ENABLED() within C (vs. within CPP #if statements) in its current form requires us to actually define every possible bool/tristate Kconfig option twice (__enabled_* and __enabled_*_MODULE variants). This results in a huge autoconf.h file, on the order of 16k lines for a x86_64 defconfig. Fixing IS_ENABLED to be able to work on the smaller subset of just things that we really have defined is step one to fixing this. Which means it has to not choke when fed non-enabled options, such as: include/linux/netdevice.h:964:1: warning: "__enabled_CONFIG_FCOE_MODULE" is not defined [-Wundef] The original prototype of how to implement a C and preprocessor compatible way of doing this came from the Google+ user "comex ." in response to Linus' crowdsourcing challenge for a possible improvement on his earlier C specific solution: #define config_enabled(x) (__stringify(x)[0] == '1') In this implementation, I've chosen variable names that hopefully make how it works more understandable. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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