1 files changed, 41 insertions, 2 deletions
diff --git a/ext/-test-/cxxanyargs/extconf.rb b/ext/-test-/cxxanyargs/extconf.rb
index 6241e836aa..0c5344a1e5 100644
--- a/ext/-test-/cxxanyargs/extconf.rb
+++ b/ext/-test-/cxxanyargs/extconf.rb
@@ -1,2 +1,41 @@
-# frozen_string_literal: true
-create_makefile("-test-/cxxanyargs")
+# frozen_string_literal: false
+
+cfg = RbConfig::CONFIG.merge(
+  'hdrdir'      => $hdrdir.quote,
+  'src'         => "#{CONFTEST_C}",
+  'arch_hdrdir' => $arch_hdrdir.quote,
+  'top_srcdir'  => $top_srcdir.quote,
+  'CC'          => RbConfig::CONFIG['CXX'],
+  'CFLAGS'      => RbConfig::CONFIG['CXXFLAGS'],
+  'INCFLAGS'    => "#$INCFLAGS",
+  'CPPFLAGS'    => "#$CPPFLAGS",
+  'ARCH_FLAG'   => "#$ARCH_FLAG",
+  'LDFLAGS'     => "#$LDFLAGS",
+  'LOCAL_LIBS'  => "#$LOCAL_LIBS",
+  'LIBS'        => "#$LIBS"
+)
+cxx = RbConfig::expand(TRY_LINK.dup, cfg)
+src = create_tmpsrc(<<~'begin') do |x|
+  #include "ruby/config.h"
+
+  namespace {
+      typedef int conftest[SIZEOF_LONG == sizeof(long) ? 1 : -1];
+      typedef int conftest[SIZEOF_VOIDP == sizeof(void*) ? 1 : -1];
+  }
+
+  int
+  main(int argc, const char** argv)
+  {
+      return !!argv[argc];
+  }
+begin
+  # We are wiping ruby.h from the source because that header file is the
+  # subject we are going to test in this extension library.
+  x.sub! %<#include "ruby.h">, ''
+end
+
+begin
+  create_makefile("-test-/cxxanyargs") if xsystem(cxx)
+ensure
+  log_src src
+end