[CHERIoT] Allow extern on cheriot_sealed global variables
#174
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resistor
approved these changes
Jun 9, 2025
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This change is needed to replicate the same behaviour exhibited in the macros.
This is useful in instances where a sealed value must be provided by an external source: an example of this need is this definition in cheriot-rtos' stdlib: here, if
CHERIOT_CUSTOM_DEFAULT_MALLOC_CAPABILITYis defined, compilation fails (because the__default_malloc_capabilitysymbol is undefined) if noextern <...> __default_malloc_capabilityis given.This PR also fixes the related semantic checks.