libbsd: new Portfile 0.11.7 & files

[Zweihorn]

Provides new port libbsd and subport libbsd-devel with new Portfile and patch files.

1. Currently, only the subport 'libbsd-devel' with patches builds successfully, based on an upstream git branch with macOS improvements.
2. WIP: The port 'libbsd' is known to fail. There is contact with the upstream maintainer and the aim to have the patches included in an upstream version in the foreseable future.

Thanks to @guillem as the 'libbsd' upstream maintainer of the freedesktop project.

Description

Utility functions from BSD systems, stripped down to a subset of utilities not available to Mac OS X / macOS yet.

This library provides useful functions commonly found on BSD systems, and lacking on others like GNU systems. Thus making it easier to port projects with strong BSD origins, without needing to embed the same code over and over again on each project.

ref https://libbsd.freedesktop.org/wiki/
ref https://gitlab.freedesktop.org/libbsd/libbsd

However, this libbsd port provides a minimized subset of utilities and was reduced to those BSD functions which are not available to Mac OS X / macOS platforms by SDK on default.

This subset of BSD utilities new to macOS is:

1. closefrom
2. dehumanize_number
3. explicit_bzero
4. expand_number
5. flopen
6. freezero
7. humanize_number
8. pidfile
9. reallocarray
10. recallocarray
11. setproctitle
12. strtoi
13. strtou
14. timeconv

The libbsd-devel sub-port provides the development version of the libbsd port, as appropriate.

A new Portfile was established accordingly.

Patch files solely address the build process to allow for a build on macOS and are based on the existing files of the autotools chain. There is no change to the code of any utility. The patches (besides the b.m. workaround) should be reusable and should have no true influence on the build process to other operating systems.

The patch files included are:

• patch010-configure.ac.diff - introducing new need_X flags as applicable for macOS and reordering most of the statements alphabetically to not get lost
• patch015-src_Makefile.am.diff - making use of a.m. flags to reduce to a subset of utilities and reordering most of the statements alphabetically
• patch016-src_Makefile.am_libbsd.sym.diff - cleaning the symbol table based on a workaround for macOS kindly provided by the upstream maintainer
• patch017-test_Makefile.am.diff - making use of a.m. flags to reduce tests as applicable and reordering most of the statements alphabetically
• patch018-man_Makefile.am.diff - combining existing manual pages by making use of a.m. flags to reduce make of manual pages as applicable to macOS and reordering most of the statements alphabetically

The 'include' files were not touched intentionally.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 11.7.9 20G1426 x86_64
Xcode 13.0 13A233

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• checked your Portfile with port lint --nitpick?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[Zweihorn]

NB: Builds with both 'libmd' 1.0.4_1 port and my local 'libmd' 1.1.0 port update.

ref #19784

[Zweihorn]

Provided as Merge Request (MR) to the upstream project.
re: https://gitlab.freedesktop.org/libbsd/libbsd/-/merge_requests/27

[Zweihorn]

This mess calls for a new branch, I presume.