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Improve docs re duplicate declarations

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-08-09 14:10:14 +01:00
parent 0cf9dd1056
commit d44dd96132
1 changed files with 14 additions and 13 deletions
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27
library/constant_time_impl.h
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@ -1,15 +1,6 @@
/**
* Constant-time functions
*
* For readability, the static inline definitions are here, and
* constant_time_internal.h has only the declarations.
*
* This results in duplicate declarations of the form:
* static inline void f() { ... }
* static inline void f();
* when constant_time_internal.h is included. This appears to behave
* exactly as if the declaration-without-definition was not present.
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
@ -37,11 +28,20 @@
#include "mbedtls/bignum.h"
#endif
/* constant_time_impl.h contains all the static inline implementations,
* so that constant_time_internal.h is more readable.
/*
* To improve readability of constant_time_internal.h, the static inline
* definitions are here, and constant_time_internal.h has only the declarations.
*
* gcc generates warnings about duplicate declarations, so disable this
* warning.
* This results in duplicate declarations of the form:
* static inline void f(); // from constant_time_internal.h
* static inline void f() { ... } // from constant_time_impl.h
* when constant_time_internal.h is included.
*
* This appears to behave as if the declaration-without-definition was not present
* (except for warnings if gcc -Wredundant-decls or similar is used).
*
* Disable -Wredundant-decls so that gcc does not warn about this. This is re-enabled
* at the bottom of this file.
*/
#ifdef __GNUC__
#pragma GCC diagnostic push
@ -531,6 +531,7 @@ static inline mbedtls_ct_condition_t mbedtls_ct_bool_not(mbedtls_ct_condition_t
}
#ifdef __GNUC__
/* Restore warnings for -Wredundant-decls on gcc */
#pragma GCC diagnostic pop
#endif