[LLVMbugs] [Bug 154] NEW: [llvm-link] global arrays don't get linked properly

[bugzilla-daemon at zion.cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=154

           Summary: [llvm-link] global arrays don't get linked properly
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-link
        AssignedTo: sabre at nondot.org
        ReportedBy: brukman+bugs at uiuc.edu


% cat a.c
int var[5];
% cat b.c
extern int var[];

void foo() {
  var[var[0]] = 42;
}
% llvm-gcc -c b.c
% llvm-gcc -c a.c
% llvm-link a.o b.o -o c.o
% llvm-dis < c.o|grep var
%var = weak global [5 x int] [ int 0, int 0, int 0, int 0, int 0 ]             ;
<[5 x int]*> [#uses=0]
%var = external global [0 x int]                ; <[0 x int]*> [#uses=2]
[... snip ...]

One would think these 'var's would become the same 'var', because, at least,
that's the intent of the programmer. I'm having similar trouble with symbols in
the Linux kernel, but there, there is no 'weak' modifier, but still two
variables with the same name, one global, one external global.



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