https://git.ruby-lang.org/ruby.git/commit/?id=7efde1bfb4

From 7efde1bfb486aa7bb57f5f355a13be040a6973ff Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Fri, 22 Jan 2021 11:26:20 -0800
Subject: conditionally add libcapstone

---
 configure.ac |  2 --
 ujit.rb      |  7 ++-----
 ujit_iface.c | 29 +++++++++++++++++------------
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/configure.ac b/configure.ac
index b34004da1e..ef0aef7298 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1234,8 +1234,6 @@ if pkg-config --exists capstone; then https://github.com/ruby/ruby/blob/trunk/configure.ac#L1234
    CAPSTONE_LIB_L=`pkg-config --libs-only-L capstone`
    LDFLAGS="$LDFLAGS $CAPSTONE_LIB_L"
    CFLAGS="$CFLAGS $CAPSTONE_CFLAGS"
-else
-   AC_MSG_ERROR(Please install capstone and pkg-config)
 fi
 
 AC_CHECK_LIB(capstone, cs_open) # Capstone
diff --git a/ujit.rb b/ujit.rb
index cdfb886795..43be881c05 100644
--- a/ujit.rb
+++ b/ujit.rb
@@ -1,14 +1,11 @@ https://github.com/ruby/ruby/blob/trunk/ujit.rb#L1
 module UJIT
-  def omg
-  end
-
   def self.disasm(iseq)
     blocks = UJIT.blocks_for(iseq)
     return if blocks.empty?
 
     str = ""
 
-    cs = UJIT::Disasm.open(UJIT::Disasm::ARCH_X86, UJIT::Disasm::MODE_64)
+    cs = UJIT::Disasm.new
 
     str << iseq.disasm
     str << "\n"
@@ -27,5 +24,5 @@ module UJIT https://github.com/ruby/ruby/blob/trunk/ujit.rb#L24
       end
     end
     str
-  end
+  end if defined?(Disasm)
 end
diff --git a/ujit_iface.c b/ujit_iface.c
index 349aa40b1b..91d3621b43 100644
--- a/ujit_iface.c
+++ b/ujit_iface.c
@@ -14,7 +14,10 @@ https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L14
 #include "ujit_core.h"
 #include "ujit_hooks.inc"
 #include "ujit.rbinc"
+
+#if HAVE_LIBCAPSTONE
 #include <capstone/capstone.h>
+#endif
 
 VALUE cUjitBlock;
 VALUE cUjitDisasm;
@@ -29,12 +32,6 @@ static const rb_data_type_t ujit_block_type = { https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L32
     0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
-static const rb_data_type_t ujit_disasm_type = {
-    "UJIT/Disasm",
-    {0, (void(*)(void *))cs_close, 0, },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
-};
-
 bool rb_ujit_enabled;
 
 // Hash table of encoded instructions
@@ -376,12 +373,19 @@ iseq_end_index(VALUE self) https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L373
     return INT2NUM(block->end_idx);
 }
 
+#if HAVE_LIBCAPSTONE
+static const rb_data_type_t ujit_disasm_type = {
+    "UJIT/Disasm",
+    {0, (void(*)(void *))cs_close, 0, },
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
+};
+
 static VALUE
-ujit_disasm_open(VALUE mod, VALUE arch, VALUE mode)
+ujit_disasm_init(VALUE klass)
 {
     csh * handle;
-    VALUE disasm = TypedData_Make_Struct(cUjitDisasm, csh, &ujit_disasm_type, handle);
-    cs_open(NUM2INT(arch), NUM2INT(mode), handle);
+    VALUE disasm = TypedData_Make_Struct(klass, csh, &ujit_disasm_type, handle);
+    cs_open(CS_ARCH_X86, CS_MODE_64, handle);
     return disasm;
 }
 
@@ -405,6 +409,7 @@ ujit_disasm(VALUE self, VALUE code, VALUE from) https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L409
     cs_free(insns, count);
     return insn_list;
 }
+#endif
 
 void
 rb_ujit_init(void)
@@ -429,13 +434,13 @@ rb_ujit_init(void) https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L434
     rb_define_method(cUjitBlock, "iseq_start_index", iseq_start_index, 0);
     rb_define_method(cUjitBlock, "iseq_end_index", iseq_end_index, 0);
 
+#if HAVE_LIBCAPSTONE
     cUjitDisasm = rb_define_class_under(mUjit, "Disasm", rb_cObject);
-    rb_define_const(cUjitDisasm, "ARCH_X86", INT2NUM(CS_ARCH_X86));
-    rb_define_const(cUjitDisasm, "MODE_64", INT2NUM(CS_MODE_64));
-    rb_define_module_function(cUjitDisasm, "open", ujit_disasm_open, 2);
+    rb_define_alloc_func(cUjitDisasm, ujit_disasm_init);
     rb_define_method(cUjitDisasm, "disasm", ujit_disasm, 2);
 
     cUjitDisasmInsn = rb_struct_define_under(cUjitDisasm, "Insn", "address", "mnemonic", "op_str", NULL);
+#endif
 
     // Initialize the GC hooks
     method_lookup_dependency = st_init_numtable();
-- 
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