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[Bug gold/6859] New: Symbols specified as -u <symbol> may erroneously ge


From: kris dot van dot hees at oracle dot com
Subject: [Bug gold/6859] New: Symbols specified as -u <symbol> may erroneously get added to the dynsym table
Date: 26 Aug 2008 14:08:15 -0000

Gold handles explicitly undefined symbols (-u <symbol>) differently from      
how the old GNU linker handles then.  With gold, if the symbol does not       
appear defined in any input object, it is added to both the symtab (symbol    
table) and the dynsym (dynamic symbol table) as an undefined symbol.  The     
old linker only adds the symbol to the symtab in that case.  It works fine if
the symbol gets defined in an input object.                     
                                                                                
The reason for this problem turns out to be the fact that during input object 
processing, "-u" symbols are checked as symbol tables are processed.  Then,   
all "-u" symbols are added as undefined symbols unless they were already      
seen (i.e. it adds all symbols that didn't appear in input object symbol      
tables).                                                                      
                                                                                
The fix for this problem turns out to be very easy: mark the "-u" symbols     
that are added after input object processing as not needing dynsym entries.

Index: gold/symtab.cc
===================================================================
RCS file: /cvs/src/src/gold/symtab.cc,v
retrieving revision 1.107
diff -r1.107 symtab.cc
176a177
>   this->dynsym_index_ = -1;

-- 
           Summary: Symbols specified as -u <symbol> may erroneously get
                    added to the dynsym table
           Product: binutils
           Version: 2.19 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
        AssignedTo: ian at airs dot com
        ReportedBy: kris dot van dot hees at oracle dot com
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=6859

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