Change `.o.d` back to `.d` because `.pi.d` is no longer created

build_config/default.rb

@@ -24,7 +24,7 @@ MRuby::Build.new do |conf|
   #   cc.defines = %w()
   #   cc.option_include_path = %q[-I"%s"]
   #   cc.option_define = '-D%s'
-  #   cc.compile_options = %Q[%{flags} -MMD -MF "%{outfile}".d -o "%{outfile}" -c "%{infile}"]
+  #   cc.compile_options = %Q[%{flags} -MMD -o "%{outfile}" -c "%{infile}"]
   # end
 
   # mrbc settings

lib/mruby/build/command.rb

@@ -87,7 +87,7 @@ module MRuby
     def run(outfile, infile, _defines=[], _include_paths=[], _flags=[])
       mkdir_p File.dirname(outfile)
       flags = all_flags(_defines, _include_paths, _flags)
-      if File.extname(outfile) == build.exts.object
+      if object_ext?(outfile)
         label = @label
         opts = compile_options
       else
@@ -157,8 +157,8 @@ module MRuby
     #   /src/value_array.h:
     #
     def get_dependencies(file)
-      dep_file = "#{file}.d"
-      return [MRUBY_CONFIG] unless File.exist?(dep_file)
+      dep_file = file.ext(".d")
+      return [MRUBY_CONFIG] unless object_ext?(file) && File.exist?(dep_file)
 
       deps = File.read(dep_file).gsub("\\\n ", "").split("\n").map do |dep_line|
         # dep_line:
@@ -172,6 +172,10 @@ module MRuby
       end.flatten.uniq
       deps << MRUBY_CONFIG
     end
+
+    def object_ext?(path)
+      File.extname(path) == build.exts.object
+    end
   end
 
   class Command::Linker < Command

tasks/toolchains/gcc.rake

@@ -15,7 +15,7 @@ MRuby::Toolchain.new(:gcc) do |conf, params|
     end
     compiler.option_include_path = %q[-I"%s"]
     compiler.option_define = '-D%s'
-    compiler.compile_options = %|-MMD -MF "%{outfile}.d" -c #{compile_opt}|
+    compiler.compile_options = "-MMD -c #{compile_opt}"
     compiler.preprocess_options = "-E -P #{compile_opt}"
     compiler.cxx_compile_flag = '-x c++ -std=gnu++03'
     compiler.cxx_exception_flag = '-fexceptions'

tasks/toolchains/openwrt.rake

@@ -11,7 +11,7 @@ MRuby::Toolchain.new(:openwrt) do |conf|
     end
     cc.option_include_path = %q[-I"%s"]
     cc.option_define = '-D%s'
-    cc.compile_options = '%{flags} -MMD -MF "%{outfile}.d" -o "%{outfile}" -c "%{infile}"'
+    cc.compile_options = '%{flags} -MMD -o "%{outfile}" -c "%{infile}"'
     cc.preprocess_options = '%{flags} -o "%{outfile}" -E -P "%{infile}"'
   end