Fix building against Ruby 3.2+ (patch included)

[Lalufu]

The rack/ruby plugin code references rb_obj_taint(), which has been removed from Ruby 3.2. The function has been deprecated for a long time, and hasn't been doing anything useful since Ruby 2.7.
The attached patch removes the call for Ruby 2.7 and onwards.

diff -uNr a/plugins/rack/rack_plugin.c b/plugins/rack/rack_plugin.c
--- a/plugins/rack/rack_plugin.c	2022-10-24 12:21:58.000000000 +0200
+++ b/plugins/rack/rack_plugin.c	2023-04-22 21:18:03.451028685 +0200
@@ -456,7 +456,11 @@
 
 static void rack_hack_dollar_zero(VALUE name, ID id) {
 	ur.dollar_zero = rb_obj_as_string(name);
+    // From ruby 2.7 onwards this is a noop, from ruby 3.2 onwards
+    // this function no longer exists
+#if !defined(RUBY27)
 	rb_obj_taint(ur.dollar_zero);
+#endif
 }
 
 #ifndef RUBY19
diff -uNr a/plugins/rack/uwsgiplugin.py b/plugins/rack/uwsgiplugin.py
--- a/plugins/rack/uwsgiplugin.py	2023-04-22 21:17:26.854810444 +0200
+++ b/plugins/rack/uwsgiplugin.py	2023-04-22 21:18:03.454028704 +0200
@@ -18,6 +18,8 @@
     CFLAGS.append('-DRUBY19')
     if version >= '2.0':
         CFLAGS.append('-DRUBY20')
+    if version >= '2.7':
+        CFLAGS.append('-DRUBY27')
     CFLAGS.append('-Wno-unused-parameter')
     rbconfig = 'RbConfig'	 
 else:
diff -uNr a/plugins/ruby19/uwsgiplugin.py b/plugins/ruby19/uwsgiplugin.py
--- a/plugins/ruby19/uwsgiplugin.py	2023-04-22 21:17:26.854810444 +0200
+++ b/plugins/ruby19/uwsgiplugin.py	2023-04-22 21:18:36.479225658 +0200
@@ -18,6 +18,8 @@
     CFLAGS.append('-DRUBY19')
     if version >= '2.0':
         CFLAGS.append('-DRUBY20')
+    if version >= '2.7':
+        CFLAGS.append('-DRUBY27')
     CFLAGS.append('-Wno-unused-parameter')
     rbconfig = 'RbConfig'	 
 else:

[xrmx]

Care to open a PR please?

[xrmx]

@Lalufu it looks like you have some local changes, I don't see the RUBY20 definition upstream. Chance there are other changes needed?

[Lalufu]

Hm, indeed, this is from another patch that Fedora carries. I'll have to look at that, the patch doesn't make a lot of sense to me right now.

[xrmx]

Let me see if I can update ruby on CI

[xrmx]

It's already 2.0+ in CI so no need for that define i guess.

[xrmx]

@Lalufu I think you may have other patches around or you ain't building master but uwsgi-2.0 branch https://github.com/unbit/uwsgi/actions/runs/5192790458/jobs/9362444450

[Lalufu]

I'm currently shuffling some things around, and will make a proper pull request out of this.

[xrmx]

@Lalufu I fixed the ruby compile errors in my pr above, now need to look at other runtimes.