Hi all,
I came across a strange compiler error that occurs when I use structured binding in combination with an OpenMP parallel region. A minimal example code is as follows:
#include <tuple>
#ifdef OPENMMP_
#include <omp.h>
#endif
auto create()
{
int a = 10;
double b = 1.0;
return std::tie(a,b);
}
int main()
{
auto [a, b] = create();
double vector[100];
#pragma omp parallel for
for (int i=0; i<a; ++i)
vector[i] = b;
}
I am using Apple clang version:
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: arm64-apple-darwin22.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
When compiled with g++ -std=c++17 test.cxx I get no the compiler error and the executable works.
When compiled with g++ -Xclang -fopenmp -std=c++17 test.cxx I get the compiler error:
test.cxx:22:19: error: reference to local binding 'a' declared in enclosing function 'main'
for (int i=0; i<a; ++i)
^
test.cxx:17:9: note: 'a' declared here
auto [a, b] = create();
^
test.cxx:23:17: error: reference to local binding 'b' declared in enclosing function 'main'
vector[i] = b;
^
test.cxx:17:12: note: 'b' declared here
auto [a, b] = create();
^
2 errors generated.
This error does not occur when I compile the code with g++-12 from the Homebrew project.
Any help is appreciated.
