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egallesio / STklos

STklos Scheme
http://stklos.net
GNU General Public License v2.0
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Use two-level namespace for bundles on macOS #512

Closed ryandesign closed 1 year ago

ryandesign commented 1 year ago

Use the two-level namespace for loadable modules on macOS instead of the flat namespace. The flat namespace is a relic from Mac OS X 10.0 (2001). The two-level namespace was introduced in Mac OS X 10.1 (2001) and the ability to resolve undefined symbols at runtime in the two-level namespace was added in Mac OS X 10.3 (2003). There's no reason to use the flat namespace anymore today.

For more info about the differences between the two types of namespaces and why the two-level namespace is better:

https://web.archive.org/web/20030604123710/http://developer.apple.com/techpubs/macosx/ReleaseNotes/TwoLevelNamespaces.html

I'm linking to an archived copy of that page because Apple has removed it from their site or at least moved it somewhere I could not find it, and it is outdated. For example it states that you cannot have any undefined symbols in the two-level namespace, but that limitation was removed in Mac OS X 10.3 with the introduction of -undefined dynamic_lookup.

egallesio commented 1 year ago

Thanks a lot, Ryan, for this PR (and for the link). PR merged.