From 21033c63cba6c2a0b402c3334668e998125b94a5 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Tue, 28 Nov 2023 12:02:58 +0100
Subject: [PATCH] Compile iseq_collector.c logic only on CRuby
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* iseq_collector.c relies on many CRuby internals, there is no point to compile it on other Rubies.
* It now fails to compile on TruffleRuby:
  ../../../../ext/debug/iseq_collector.c: In function ‘imemo_type’:
  ../../../../ext/debug/iseq_collector.c:18:13: error: implicit declaration of function ‘RBASIC’ [-Werror=implicit-function-declaration]
    18 |     return (RBASIC(imemo)->flags >> FL_USHIFT) & imemo_mask;
        |            ^~~~~~
---
 ext/debug/debug.c          | 4 ++++
 ext/debug/extconf.rb       | 1 +
 ext/debug/iseq_collector.c | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/ext/debug/debug.c b/ext/debug/debug.c
index 9eaac2bbd..f1161440f 100644
--- a/ext/debug/debug.c
+++ b/ext/debug/debug.c
@@ -180,7 +180,9 @@ iseq_last_line(VALUE iseqw)
 }
 #endif
 
+#ifdef CRUBY
 void Init_iseq_collector(void);
+#endif
 
 void
 Init_debug(void)
@@ -210,5 +212,7 @@ Init_debug(void)
     rb_define_method(rb_cISeq, "last_line", iseq_last_line, 0);
 #endif
 
+#ifdef CRUBY
     Init_iseq_collector();
+#endif
 }
diff --git a/ext/debug/extconf.rb b/ext/debug/extconf.rb
index b4e78fbe3..dc2964d2c 100644
--- a/ext/debug/extconf.rb
+++ b/ext/debug/extconf.rb
@@ -4,6 +4,7 @@
 $distcleanfiles << "debug_version.h"
 
 if defined? RubyVM
+  $defs << '-DCRUBY'
   $defs << '-DHAVE_RB_ISEQ_PARAMETERS'
   $defs << '-DHAVE_RB_ISEQ_CODE_LOCATION'
 
diff --git a/ext/debug/iseq_collector.c b/ext/debug/iseq_collector.c
index f87c4f978..3504dee6d 100644
--- a/ext/debug/iseq_collector.c
+++ b/ext/debug/iseq_collector.c
@@ -1,3 +1,4 @@
+#ifdef CRUBY
 #include <ruby/ruby.h>
 
 VALUE rb_iseqw_new(VALUE v);
@@ -89,3 +90,4 @@ Init_iseq_collector(void)
     rb_define_singleton_method(rb_mObjSpace, "each_iseq", each_iseq, 0);
     rb_define_singleton_method(rb_mObjSpace, "count_iseq", count_iseq, 0);
 }
+#endif