Regex and openmp segmentation fault with g++ -fno-pic -no-pie. Why?

Question

The following code causes Segmentation fault (core dumped):

#include <regex>
#include <omp.h>
using namespace std;

int main()
{
  regex expr("^(.[^ ]+\.)+(.+)$");
  return 0;
}

when compiled with:

g++-10 -fno-pic -no-pie -fopenmp tmp.cpp
g++-7 -fno-pic -no-pie -fopenmp tmp.cpp

while it works if compiled without the two flags -fno-pic -no-pie or removing -fopenmp:

g++-10 -fopenmp tmp.cpp
g++-7 -fopenmp tmp.cpp
g++-10 -fno-pic -no-pie tmp.cpp

Also g++-10 without those two flags will compile a dynamic library and not an executable it seems, so I am forced to use those.

I don't know much about this stuff so I am puzzled. Any help is welcome.

question from:https://stackoverflow.com/questions/65924630/regex-and-openmp-segmentation-fault-with-g-fno-pic-no-pie-why

Answer 1

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