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

[Garba Peter via llvm-dev]

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.


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


--



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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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