[vim/vim] Remove legacy support for NeXTSTEP (clean up after deprecating it in v9.1.1727) (PR #19582)

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Christian Brabandt

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Mar 5, 2026, 2:11:35 PM (yesterday) Mar 5

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The NeXTSTEP operating system has been obsolete for decades. The special-case code required to support it adds unnecessary complexity, preprocessor conditionals, and non-standard workarounds to the codebase.

This commit removes all support for NeXTSTEP, simplifying the code and build system in several ways:

Replaced custom configure checks for union wait with a standard AC_CHECK_FUNCS call for waitpid.
Removed all conditional code that used the non-standard union wait for process status, relying solely on a standard int.
Replaced calls to the non-standard wait4() function with the POSIX-standard waitpid().
Cleaned up headers (os_unix.h, os_unixx.h) to remove NeXT-specific workarounds and macros.
Removed obsolete NeXT compilation instructions from the INSTALL file.

This change improves maintainability and makes the Unix process handling code more linear and compliant with modern POSIX standards.

related: #18079

You can view, comment on, or merge this pull request online at:

https://github.com/vim/vim/pull/19582

Commit Summary

5ea1cbd Remove legacy support for NeXTSTEP

File Changes

(12 files)

Patch Links:

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Christian Brabandt

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Mar 5, 2026, 3:14:21 PM (yesterday) Mar 5

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@chrisbra pushed 1 commit.

db22a88 Remove legacy support for NeXTSTEP

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