From: ian@airs.com   
      
   anton@mips.complang.tuwien.ac.at (Anton Ertl) writes:   
      
   > What I expected is that the linker complains about duplicate symbols   
   > (irrespective of optimization level).  I was very surprised that GNU   
   > ld produced only warnings for the example given, and that linking   
   > succeeded.   
      
   The linker is acting correctly.  When GCC sees an uninitialized   
   definition, it emits a common symbol.  As our esteemed moderator says,   
   that is a historical artifact.  GCC supports the -fno-common option,   
   q.v., to change this behaviour.   
      
   Ian   
      
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