[llvm-dev] Linker error while linking DataFlowSanitizer to LLVM IR

[Dipanjan Das via llvm-dev]

This happens with LLVM 4.0, too. Is it a bug I am hitting, by any chance?

On 14 June 2017 at 17:00, Dipanjan Das <mail.dipanjan.das at gmail.com> wrote:

>
> I am using pre-built LLVM/Clang 3.8.0 binaries on Ubuntu 16.04.2, 64 bit.
> I tried to lift a minimal program to LLVM IR, then link the IR to
> DataFlowSanitizer libraries to produce executable code. In the second step,
> the process throws a bunch of linker errors.
>
> =========================================
>
> #include <sanitizer/dfsan_interface.h>
> #include <assert.h>
>
> int main(void) {
>   int i = 1;
>
>   dfsan_label i_label = dfsan_create_label("i", 0);
>   dfsan_set_label(i_label, &i, sizeof(i));
>
>   return 0;
> }
>
> =========================================
>
> clang -c -emit-llvm -fsanitize=dataflow test.c -o test.bc
>
> clang -fsanitize=dataflow test2.bc -o test2
>
> /usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../x86_64-linux-gnu/Scrt1.o: In
> function `_start':
> (.text+0x20): undefined reference to `main'
>
> /tmp/test2-c642ef.o: In function `dfs$main':
>
> test2.bc:(.text+0x96): undefined reference to `dfs$dfsan_create_label'
>
> test2.bc:(.text+0xeb): undefined reference to `dfs$dfsan_set_label'
>
> /tmp/test2-c642ef.o: In function `dfs$dfsw$dfsan_create_label':
>
> test2.bc:(.text+0x16e): undefined reference to `dfs$dfsan_create_label'
>
> /tmp/test2-c642ef.o: In function `dfs$dfsw$dfsan_set_label':
>
> test2.bc:(.text+0x1e4): undefined reference to `dfs$dfsan_set_label'
>
> clang-3.8: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> =========================================
>
> Any idea what might I be doing wrong?
>
> --
>
> Thanks & Regards,
> Dipanjan
>



-- 

Thanks & Regards,
Dipanjan
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