ruby31: error: use of undeclared identifier 'MAP_ANONYMOUS'

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/166925/steps/install-port/logs/stdio

gc.c:11141:88: error: use of undeclared identifier 'MAP_ANONYMOUS'
        char *ptr = mmap(NULL, alignment + size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
                                                                                       ^
1 error generated.

On old systems, MAP_ANONYMOUS was called MAP_ANON. If the developers don't want to add support for this, the legacy support portgroup could be used.

[ryandesign (Ryan Carsten Schmidt)]

I've reported it to the developers: ​https://bugs.ruby-lang.org/issues/18556

[kimuraw (kimura wataru)]

thanks ryandesign, I'll apply the upstream fix.

​https://github.com/ruby/ruby/pull/5506/files

[kimura wataru <kimuraw@…>]

In 5583fcf2e1f851bb5c3b48ff4d92df26e70969f8/macports-ports (master):

lang/ruby31: fix build error on older macOS, such as 10.10

closes: #64349

• fix build error "use of undeclared identifier 'MAP_ANONYMOUS'" on older macOS
• fix "upgrade" error at destroot of bundled gem that contains c-extension, such as rbs or debug
  • extconf.rb generates different Makefile from the Makefile at "install"

[evanmiller (Evan Miller)]

This issue should be re-opened. See failing build:

​https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/175231

It appears that this commit:

[fd327becf635c772aef1b1a2e3531e6afffe1dba/macports-ports]

deleted the patch, which apparently was not merged in time for 3.1.1.

[ryandesign (Ryan Carsten Schmidt)]

See #64957.