[PATCH] utils: Remove double compile from better_compile

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Poking around the ast to correct linenumbers works well for runtime failures
but not for parsing ones. We can use blank linefeeds to correct the line
numbers instead, with the advantage that we don't need to double compile.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index cd5fced..9a3efb2 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -292,7 +292,7 @@ def _print_trace(body, line):
             error.append('     %.4d:%s' % (i, body[i-1].rstrip()))
     return error
 
-def better_compile(text, file, realfile, mode = "exec", lineno = None):
+def better_compile(text, file, realfile, mode = "exec", lineno = 0):
     """
     A better compile method. This method
     will print the offending lines.
@@ -301,10 +301,9 @@ def better_compile(text, file, realfile, mode = "exec", lineno = None):
         cache = bb.methodpool.compile_cache(text)
         if cache:
             return cache
-        code = compile(text, realfile, mode, ast.PyCF_ONLY_AST)
-        if lineno is not None:
-            ast.increment_lineno(code, lineno)
-        code = compile(code, realfile, mode)
+        # We can't add to the linenumbers for compile, we can pad to the correct number of blank lines though
+        text2 = "\n" * int(lineno) + text
+        code = compile(text2, realfile, mode)
         bb.methodpool.compile_cache_add(text, code)
         return code
     except Exception as e: