Merge pull request #2000 from kyab/add-help-for-mruby-config

add --help option to mruby-config

mrbgems/mruby-bin-mruby-config/mruby-config

@@ -5,6 +5,12 @@ while [ $# -gt 0 ]; do
     --cflags) echo MRUBY_CFLAGS;;
     --ldflags) echo MRUBY_LDFLAGS;;
     --libs) echo MRUBY_LIBS;;
+    --help) echo "Usage: mruby-config [switches]"
+            echo "  switches:"
+            echo "  --cflags    print flags passed to compiler"
+            echo "  --ldflags   print flags passed to linker"
+            echo "  --libs      print linked libraries" 
+            exit 0;;
   esac
   shift
 done

mrbgems/mruby-bin-mruby-config/mruby-config.bat

@@ -6,6 +6,7 @@ if "%0" equ "" goto :eof
 if "%0" equ "--cflags" goto cflags
 if "%0" equ "--ldflags" goto ldflags
 if "%0" equ "--libs" goto libs
+if "%0" equ "--help" goto showhelp
 echo Invalid Option
 goto :eof
 
@@ -20,3 +21,10 @@ goto top
 :ldflags
 echo MRUBY_LDFLAGS
 goto top
+
+:showhelp
+echo Usage: mruby-config [switches]
+echo   switches:
+echo   --cflags    print flags passed to compiler
+echo   --ldflags   print flags passed to linker
+echo   --libs      print linked libraries