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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi,
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<div>When I tried to use the latest version of LLVM tools (clang as the frontend) to compile and link a project with multiple c files, it appears that each of the generated .bc file contains a definition of pthread_equal, resulting llvm-link failure with error
message "multiply symbols defined". I tried but did not get any answer on the web. So I turn to you for help.</div>
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<div>Here is the command lines that I use to compile and link the files:</div>
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<div>clang -O2 -emit-llvm -c *.c -o *.bc;</div>
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<div>llvm-link *.bc -o BARNES.bc</div>
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<div>Then I get this error:</div>
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<div>llvm-link: link error in 'code_io.o': Linking globals named 'pthread_equal': symbol multiply defined!</div>
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<div>After using llvm-dis to get the llvm assembly code, I found that in every .bc, pthread_equal is defined:</div>
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<div>define i32 @pthread_equal(i32 %__thread1, i32 %__thread2) nounwind readnone inlinehint {</div>
<div>entry:</div>
<div> %cmp = icmp eq i32 %__thread1, %__thread2</div>
<div> %conv = zext i1 %cmp to i32</div>
<div> ret i32 %conv</div>
<div>}</div>
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<div>That results multiple definitions of the same function and the linkage error.</div>
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<div>NOTE: The above compile and link method works for single C file program.</div>
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So what do I miss that can avoid this issue?</div>
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<div>Thank you very much!</div>
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<div>Yuelu</div>
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