https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113143
--- Comment #3 from Alexander von Gluck <kallisti5 at unixzen dot com> --- Good call out. It looks like in 2004 these functions were flagged as obsolescent though: https://pubs.opengroup.org/onlinepubs/009695399/functions/makecontext.html Here's the note on it in the linux man page for getcontext: " glibc 2.1. SUSv2, POSIX.1-2001. Removed in POSIX.1-2008, citing portability issues, and recommending that applications be rewritten to use POSIX threads instead. " upstream go usage: * makecontext: no code matches as of go 1.22 (main) * getcontext: netbsd,solaris,freebsd code usage as of go 1.22 (main) * setcontext: netbsd,freebsd code usages as of go 1.22 (main) * swapcontext: freebsd code usages as of go 1.22 (main) Per the 2004 spec: "The obsolescent functions getcontext(), makecontext(), and swapcontext() can be replaced using POSIX threads functions." Essentially, for quite some time, (get|make|set)context are only used on the BSD's and Solaris... thus invocation of include<ucontext.h> should be guarded / masked off on all other platforms.
