1 files changed, 31 insertions, 0 deletions
diff --git a/ext/mwrap/extconf.rb b/ext/mwrap/extconf.rb
new file mode 100644
index 0000000..3336548
--- /dev/null
+++ b/ext/mwrap/extconf.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+# Copyright (C) mwrap hackers <mwrap-public@80x24.org>
+# License: GPL-2.0+ <https://www.gnu.org/licenses/gpl-2.0.txt>
+require 'mkmf'
+
+have_func 'mempcpy'
+have_library 'urcu-cds' or abort 'userspace RCU not installed'
+have_header 'urcu/rculfhash.h' or abort 'rculfhash.h not found'
+have_library 'urcu-bp' or abort 'liburcu-bp not found'
+have_library 'dl'
+have_library 'c'
+have_library 'execinfo' # FreeBSD
+$defs << '-DHAVE_XXHASH' if have_header('xxhash.h')
+
+have_struct_member('struct sockaddr_un', 'sun_len', %w(sys/socket sys/un.h))
+
+if try_link(<<EOC)
+int main(void) { return __builtin_add_overflow_p(0,0,(int)1); }
+EOC
+  $defs << '-DHAVE_BUILTIN_ADD_OVERFLOW_P'
+end
+
+if try_link(<<EOC)
+int main(int a) { return __builtin_add_overflow(0,0,&a); }
+EOC
+  $defs << '-DHAVE_BUILTIN_ADD_OVERFLOW_P'
+else
+  abort 'missing __builtin_add_overflow'
+end
+
+create_makefile 'mwrap'