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config: Allow Mbed to implement TIMING_C

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Mbed OS now provides POSIX-like time functions, although not alarm() nor
signal(). It is possible to implement MBEDTLS_TIMING_ALT on Mbed OS, so
we should not artificially prevent this in check-config. Remove the the
check that prevents implementing MBEDTLS_TIMING_ALT on Mbed OS.

Note that this limitation originally was added in the following commit,
although there isn't much context around why the restriction was
imposed: 63e7ebaaa184 ("Add material for generating yotta module"). In
2015, Mbed OS was quite a different thing: no RTOS, no threads, just an
asynchronous event loop model. I'd suppose the asynchronous event loop
model made it difficult before to implement MBEDTLS_TIMING_C on Mbed OS,
but that is no longer the case.

Fixes #4633

Signed-off-by: Jaeden Amero <jaeden.amero@arm.com>
This commit is contained in:
Jaeden Amero 2021-06-08 18:31:27 +01:00
parent 7a4c7589c8
commit 128c94dd87
2 changed files with 5 additions and 3 deletions
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3
ChangeLog.d/mbed-can-do-timing.txt Normal file
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@ -0,0 +1,3 @@
Bugfix
* Remove outdated check-config.h check that prevented implementing the
timing module on Mbed OS. Fixes #4633.

5
include/mbedtls/check_config.h
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@ -55,9 +55,8 @@
#endif
#endif /* _WIN32 */
#if defined(TARGET_LIKE_MBED) && \
( defined(MBEDTLS_NET_C) || defined(MBEDTLS_TIMING_C) )
#error "The NET and TIMING modules are not available for mbed OS - please use the network and timing functions provided by mbed OS"
#if defined(TARGET_LIKE_MBED) && defined(MBEDTLS_NET_C)
#error "The NET module is not available for mbed OS - please use the network functions provided by Mbed OS"
#endif
#if defined(MBEDTLS_DEPRECATED_WARNING) && \