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[patch] document that check_typedef can throw an exception


Hi.

I will check this in in a few days if there are no objections.

2011-10-27  Doug Evans  <dje@google.com>

	* gdbtypes.c (check_typedef): Document that this function can
	throw an exception.

Index: gdbtypes.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbtypes.c,v
retrieving revision 1.220
diff -u -p -r1.220 gdbtypes.c
--- gdbtypes.c	14 Oct 2011 20:22:17 -0000	1.220
+++ gdbtypes.c	27 Oct 2011 21:53:52 -0000
@@ -1454,6 +1454,9 @@ stub_noname_complaint (void)
    not been computed and we're either in the middle of reading symbols, or
    there was no name for the typedef in the debug info.
 
+   NOTE: Lookup of types for opaque types can throw some errors during
+   invalid symbol files.  Thus this function can throw an exception.
+
    If TYPE is a TYPE_CODE_TYPEDEF, its length is updated to the length of
    the target type.
 


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