Expose os_log API to include symbol names and source line numbers

Number:rdar://35958308 Date Originated:11.12.2017
Status:Open Resolved:NO
Product:macOS + SDK Product Version:10.13
Classification:Feature Reproducible:
os_log captures the image, function, filename, and linenumber automatically, but may not always be correct, e.g. in the case of logging from a wrapper function such as _swift_os_log:


It would be helpful if you could either expose an os_log variant that takes this info as freeform input, or one that takes the address of the relevant function, similar to the trick used by _swift_os_log, without having to expose os_log_pack_send and friends too:



It appears os_log_with_args would be the perfect candidate for this. Please please please make this function non-SPI :)

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