mbedtls warning "implicit declaration of function 'time'"


David Leach
 

I’m having some weirdness with building the mbedtls module giving me a compiler warning related to “time”:

 

/home/dleach/work/zephyrproject/modules/crypto/mbedtls/include/mbedtls/platform_time.h:74:24: warning: implicit declaration of function 'time'; did you mean 'gmtime'? [-Wimplicit-function-declaration]

#define mbedtls_time   time

                        ^~~~

/home/dleach/work/zephyrproject/modules/crypto/mbedtls/library/ssl_cli.c:697:9: note: in expansion of macro 'mbedtls_time'

     t = mbedtls_time( NULL );

         ^~~~~~~~~~~~

 

The warning is coming from my PR #17736 for /tests/lib/fdtable/. What is confusing me is that using similar configurations for /tests/crypto/rand32, which builds the same file, doesn’t get the warnings. Generally speaking the mbedtls stuff is an optional configuration between mbedtls and tinycrypt but for the KW41Z I have it generically turned mbedtls on.

 

I can also get the warning to go away for the fdtable test if I enable “CONFIG_NEW_LIBC”.

 

David Leach

 

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