Make the releases compatible with JRuby & co

ext/bootsnap/extconf.rb

@@ -1,19 +1,24 @@
 # frozen_string_literal: true
 require("mkmf")
-$CFLAGS << ' -O3 '
-$CFLAGS << ' -std=c99'
 
-# ruby.h has some -Wpedantic fails in some cases
-# (e.g. https://github.com/Shopify/bootsnap/issues/15)
-unless ['0', '', nil].include?(ENV['BOOTSNAP_PEDANTIC'])
-  $CFLAGS << ' -Wall'
-  $CFLAGS << ' -Werror'
-  $CFLAGS << ' -Wextra'
-  $CFLAGS << ' -Wpedantic'
+if RUBY_ENGINE == 'ruby'
+  $CFLAGS << ' -O3 '
+  $CFLAGS << ' -std=c99'
 
-  $CFLAGS << ' -Wno-unused-parameter' # VALUE self has to be there but we don't care what it is.
-  $CFLAGS << ' -Wno-keyword-macro' # hiding return
-  $CFLAGS << ' -Wno-gcc-compat' # ruby.h 2.6.0 on macos 10.14, dunno
-end
+  # ruby.h has some -Wpedantic fails in some cases
+  # (e.g. https://github.com/Shopify/bootsnap/issues/15)
+  unless ['0', '', nil].include?(ENV['BOOTSNAP_PEDANTIC'])
+    $CFLAGS << ' -Wall'
+    $CFLAGS << ' -Werror'
+    $CFLAGS << ' -Wextra'
+    $CFLAGS << ' -Wpedantic'
+
+    $CFLAGS << ' -Wno-unused-parameter' # VALUE self has to be there but we don't care what it is.
+    $CFLAGS << ' -Wno-keyword-macro' # hiding return
+    $CFLAGS << ' -Wno-gcc-compat' # ruby.h 2.6.0 on macos 10.14, dunno
+  end
 
-create_makefile("bootsnap/bootsnap")
+  create_makefile("bootsnap/bootsnap")
+else
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+end

lib/bootsnap/version.rb

@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 module Bootsnap
-  VERSION = "1.7.0"
+  VERSION = "1.7.1.pre1"
 end