--- a/src/gearsTools/pmake.pl	Mon Dec 14 15:57:53 2020 +0900
+++ b/src/gearsTools/pmake.pl	Mon Dec 14 20:44:38 2020 +0900
@@ -5,7 +5,7 @@
 use Cwd 'getcwd';
 use File::Path 'rmtree';
 
-my ($cc,$cflags,$asm,$ld,$ldflags,$libgcc,$cmake,$kernel_cflags,$kernel_ld_flags,$kernel_ld_command, $initcode_cflags, $initcode_ld_command);
+my ($cc,$cflags,$asm,$ld,$ldflags,$libgcc,$cmake,$kernel_cflags,$kernel_ld_flags,$kernel_ld_command, $initcode_cflags, $initcode_ld_command,$cbcmdir);
 
 my $curdir = getcwd;
 
@@ -19,6 +19,13 @@
       print "delete ...\n";
       map { rmtree $_ } @current_dir_file;
     }
+    shift;
+  } else {
+     if ($ARGV[0] =~ /--llvm/) {
+         shift;
+         $cbcmdir = $ARGV[0];
+         shift;
+     }
   }
 }
 
@@ -32,9 +39,11 @@
     my $armdir = "/usr/local/Cellar/arm-none-eabi-gcc/9-2019-q4-major";
     $objcopy = "$armdir/bin/arm-none-eabi-objcopy";
     # my $cbcmdir = "/usr/local/Cellar/cbc/llvm10";
-    my $cbcmdir = `brew info --formula cbc | grep llvm`;
-    chop $cbcmdir;
-    $cbcmdir =~ s/ .*//;
+    if (! defined $cbcmdir) {
+        $cbcmdir = `brew info --formula cbc | grep llvm`;
+        chop $cbcmdir;
+        $cbcmdir =~ s/ .*//;
+    }
     if (! -d $cbcmdir) {
         die "cant' find cbclangdir $cbcmdir";
     }