[Bug libc/16291] feature request: provide simpler ways to compute stack and tls boundaries

["bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16291

--- Comment #17 from Rich Felker <bugdal at aerifal dot cx> ---
Kostya, for what it's worth, I would very much prefer an API based on function
calls rather than external-linkage static and thread-local objects. Using
function calls gives the implementation a lot more freedom. In particular, as
long as the API is reasonable, I'd like to support it in musl libc, but we
don't require or plan to require a toolchain that supports TLS as a dependency
for building libc. In general, I think going through accessor functions has a
better chance of getting other FOSS systems to adopt the same or similar API,
making it easier for tools/libraries that need to use this API.

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