[llvm-dev] Crash with llvm 8.0.0 and -fembed-bitcode option

[Tom Stellard via llvm-dev]

On 05/23/2019 08:26 AM, Garba Peter via llvm-dev wrote:
> Hi,
> 
> I found a bug in llvm 8.0.0. 
> When you compile with the "-fembed-bitcode" option it will lead to a crash when executing the output binary.
> 

Can you file a bug for this at bugs.llvm.org and cc me?

-Tom

> For unknown reason the assembled x86 code is different when the "-fembed-bitcode" option is supplied.
> 
> It works with clang 7.0.1
> 
> 
> a.cpp:
> #include <string>
> #include <iostream>
> 
> int func(int a);
> 
> int main(int argc, char **argv) {
> std::string s = std::to_string(func(argc));
> std::cout << s << std::endl;
> return 0;
> }
> 
> b.cpp:
> int func(int a) {
> return a+1;
> }
> 
> 
> Compile with:
> 
> => clang++-8 a.cpp b.cpp -fembed-bitcode && ./a.out
> 
> 
> and it fails:
> 
> => [1]    14811 segmentation fault (core dumped)  ./a.out
> 
> 
> 
> Compile with:
> 
> => clang++-8 a.cpp b.cpp  && ./a.out 
> 
> 
> and it works:
> 
> => 2
> 
> 
> 
> 
> Best Regards,
> 
> Peter
> 
> 
> -- 
> 
> 
> 
> Thales
> 
> *Peter Garba*
> Software Security Expert
> 
> Gemalto is now part of the Thales Group.
> Please note that my new email address is peter.garba at thalesgroup.com <mailto:peter.garba at thalesgroup.com>
> 
>  
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