Moved up os.makedirs for core directory.

Strange problem creating files with file paths with spaces.

Added try/except catch on main to commit print buffer for context of traceback.

tools/mkbuildoptglobals.py

@@ -187,6 +187,7 @@
 import glob
 import os
 import platform
+import traceback
 import sys
 import textwrap
 import time
@@ -305,7 +306,6 @@ def add_include_line(build_opt_fqfn, include_fqfn):
     with open(build_opt_fqfn, 'a', encoding="utf-8") as build_opt:
         build_opt.write('-include "' + include_fqfn.replace('\\', '\\\\') + '"\n')
 
-
 def extract_create_build_opt_file(globals_h_fqfn, file_name, build_opt_fqfn):
     """
     Extract the embedded build.opt from Sketch.ino.globals.h into build
@@ -655,6 +655,10 @@ def main():
     print_dbg(f"first_time:             {first_time}")
     print_dbg(f"use_aggressive_caching_workaround: {use_aggressive_caching_workaround}")
 
+    if not os.path.exists(build_path_core):
+        os.makedirs(build_path_core)
+        print_msg("Clean build, created dir " + build_path_core)
+
     if first_time or \
     not use_aggressive_caching_workaround or \
     not os.path.exists(commonhfile_fqfn):
@@ -667,10 +671,6 @@ def main():
         touch(commonhfile_fqfn)
         print_err(f"Neutralized future timestamp on build file: {commonhfile_fqfn}")
 
-    if not os.path.exists(build_path_core):
-        os.makedirs(build_path_core)
-        print_msg("Clean build, created dir " + build_path_core)
-
     if os.path.exists(source_globals_h_fqfn):
         print_msg("Using global include from " + source_globals_h_fqfn)
 
@@ -750,4 +750,10 @@ def main():
     handle_error(0)   # commit print buffer
 
 if __name__ == '__main__':
-    sys.exit(main())
+    rc = 1
+    try:
+        rc = main()
+    except:
+        print_err(traceback.format_exc())
+        handle_error(0)
+    sys.exit(rc)