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32e889dfc3
The intended logic around MBEDTLS_xxx_ALT is to exclude them from full because they require the alternative implementation of one or more library functions, except that MBEDTLS_PLATFORM_xxx_ALT are different: they're alternative implementations of a platform function and they have a built-in default, so they should be included in full. Document this. Fix a bug whereby MBEDTLS_PLATFORM_xxx_ALT didn't catch symbols where xxx contains an underscore. As a consequence, MBEDTLS_PLATFORM_GMTIME_R_ALT and MBEDTLS_PLATFORM_NV_SEED_ALT are now enabled in the full config. Explicitly exclude MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT because it behaves like the non-platform ones, requiring an extra build-time dependency. Explicitly exclude MBEDTLS_PLATFORM_NV_SEED_ALT from baremetal because it requires MBEDTLS_ENTROPY_NV_SEED, and likewise explicitly unset it from builds that unset MBEDTLS_ENTROPY_NV_SEED. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>