Avoid redundant declaration of error_number_to_condition with GCC -Wredundant-decls #1701
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…edundant-decls GCC 14+ diagnoses a redundant redeclaration of asio::error::detail::error_number_to_condition(int) when error_code.ipp is included via error_code.hpp prior to the public declaration in error.hpp. Introduce a local guard macro to ensure the forward declaration is emitted only once per translation unit, while preserving existing inclusion paths and behavior. No functional or ABI changes. Fixes builds using -Wredundant-decls -Werror with GCC 14/15.
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GCC 14+ diagnoses a redundant redeclaration of
when
impl/error_code.ippis included viaerror_code.hppprior to thepublic declaration in
error.hpp.Guard the forward declaration so it is emitted only once per
translation unit, while preserving existing inclusion order and
behavior.
No functional or ABI changes.
Fixes #1697.