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option-groups.h only explicitely #defines options that are enabled. EGLIBC options are typically pre-processed under the assumption that if an option is not explicitely defined then it evaluates as 0. This assumption is correct, but it generates a compiler warning message each time an undefined symbol is being evaluated. In order to remove the warnings, each EGLIBC option is now defined as 1 if the option is enabled or as 0 otherwise. The consequence is we cannot use #ifdef OPTION_XXX when evaluating the option, we must always use #if OPTION_XXX. [YOCTO #7001] (From OE-Core rev: 7f1bdc331304a61a4836a5752bca210450b6c5b5) Signed-off-by: Juro Bystricky <jurobystricky@hotmail.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>