cjones051073 / macports-legacy-support

MacPorts support for missing functions in legacy macOS versions

MacPorts Support for legacy OSX versions

Installs a number of wrapper headers around system headers that add functionality missing in various older OSX releases.

Installed headers use the include_next pre-processor feature to add the missing features and then forward include the original header. So using these headers instead of the originals should be transparent.

Missing functions are compiled into a library that must also be linked into any builds using the wrapped headers. This is handled in MacPorts via the legacysupport PortGroup.

Wrapped headers are:

• cmath : Adds declaration of various long long methods missing in OSX10.6 and older.
• stdio.h : Adds getline and getdelim functions missing in OSX10.6 and older.
• stdlib.h : Adds posix_memalign functional replacement, missing in OSX10.5 and older.
• string.h : Adds strnlen, strndup and memmem functions missing in OSX10.6 and older.
• time.h : Adds clock_gettime function missing in OSX10.11 and older.
• wchar.h : Adds functions wcsdup, wcsnlen, wcpcpy, wcpncpy, wcscasecmp, wcsncasecmp missing in OSX10.6 and older.
• xlocale/_wchar.h : Adds functions wcscasecmp_l, wcsncasecmp_l missing in OSX10.6 and older.
• sys/fcntl.h : Adds missing O_CLOEXEC, AT_FDCWD, AT_EACCESS, AT_SYMLINK_NOFOLLOW, : AT_SYMLINK_FOLLOW, and AT_REMOVEDIR definitions as required.
• sys/fcntl.h : Adds openat function missing in OSX10.9 and older.
• sys/mman.h : Adds missing MAP_ANONYMOUS definition as required.
• sys/stdio.h : Adds renameat function missing in OSX10.9 and older.
• sys/stat.h : Adds fchmodat, fstatat, and mkdirat functions missing in OSX10.9 and older. : Adds "lchmod", missing in OSX10.4.
• sys/unistd.h : Adds getattrlistat, readlinkat, faccessat, fchownat, linkat, symlinkat, : and unlinkat functions missing in OSX10.9 and older.