I'm compiling the C++ code below with g++ 14.0.0:
g++ -I/path/to/c++/14.0.0 -L/path/to/c++/libstdc++ -ltbb -std=c++23 -o main main.cc
#include <iostream>
#include <algorithm>
#include <execution>
#include <ranges>
#include <thread>
#include <syncstream>
int main()
{
using namespace std::chrono_literals;
auto r = std::views::iota(0) | std::views::take(10);
auto input_range = std::ranges::common_view(r);
std::for_each(std::execution::par_unseq, std::ranges::begin(input_range), std::ranges::end(input_range),
[&](int i) {
std::thread::id this_id = std::this_thread::get_id();
std::this_thread::sleep_for(2000ms);
std::osyncstream(std::cout) << this_id << std::endl ;
});
return 0;
}
the code compiles but I get the warning
In function ‘_RandomAccessIterator __pstl::__internal::__brick_unique(_RandomAccessIterator, _RandomAccessIterator, _BinaryPredicate, std::true_type)’:
note: ‘#pragma message: [Parallel STL message]: "Vectorized algorithm unimplemented, redirected to serial"’
1219 | _PSTL_PRAGMA_MESSAGE("Vectorized algorithm unimplemented, redirected to serial");
I'm configuring gcc with
./configure --prefix=/path/to/install/dir --disable-multilib --with-system-zlib --enable-default-pie --enable-default-ssp --disable-fixincludes --with-mpfr=/path/to/mpfr --with-mpc=/path/to/mpc --with-gmp=/path/to/gmp --enable-languages=c,c++,fortran,go,lto,m2,objc,obj-c++ --no-create --no-recursion
and config.log has the variable PKG_CONFIG_PATH with the correct path to MKL TBB.
I thought that p2408 was implemented as per the this post.
Anyone knows what could I be doing wrong? TBB is installed
The code seems to have the same problem on godbolt.
Per the compiler support guide on cppreference only MSVC version 19.34 and above supports p2408R5.