CODEWITHSUNDEEP
c++linuxg++mingw-w64
Zacki
Zacki

Reputation: 177

Specify thread model on ubuntu mingw (if possible)

Im running a program on linux with g++ and everything works fine. If i compile using x86_64-w64-mingw32-g++ it crashes with error: ‘std::thread’ has not been declared.

The part where my code crashed is fairly simple:

#include <thread>

int main()
{
    int cores = std::thread::hardware_concurrency();
}

I figured out that mingw uses win32 threads, i want it to use posix threads. Version is:

:~$ x86_64-w64-mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=x86_64-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-w64-mingw32/9.3-win32/lto-wrapper
Target: x86_64-w64-mingw32
Configured with: ../../src/configure --build=x86_64-linux-gnu --prefix=/usr --includedir='/usr/include' --mandir='/usr/share/man' --infodir='/usr/share/info' --sysconfdir=/etc --localstatedir=/var --disable-silent-rules --libdir='/usr/lib/x86_64-linux-gnu' --libexecdir='/usr/lib/x86_64-linux-gnu' --disable-maintainer-mode --disable-dependency-tracking --prefix=/usr --enable-shared --enable-static --disable-multilib --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --libdir=/usr/lib --enable-libstdcxx-time=yes --with-tune=generic --with-headers=/usr/x86_64-w64-mingw32/include --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-libgomp --enable-languages=c,c++,fortran,objc,obj-c++,ada --enable-lto --enable-threads=win32 --program-suffix=-win32 --program-prefix=x86_64-w64-mingw32- --target=x86_64-w64-mingw32 --with-as=/usr/bin/x86_64-w64-mingw32-as --with-ld=/usr/bin/x86_64-w64-mingw32-ld --enable-libatomic --enable-libstdcxx-filesystem-ts=yes --enable-dependency-tracking
Thread model: win32
gcc version 9.3-win32 20200320 (GCC)

As you can see thread model is win32, (how) can i change it? In the mingw include paths there is a 9.3-posix folder, but it seems it isnt used so far.

As you can see here you can:

I'm installing mingw-w64 on Windows and there are two options: win32 threads and posix threads.

Is that possible on linux aswell?

Upvotes: 1

Views: 1067

Answers (1)

Henry Le Berre
Henry Le Berre

Reputation: 920

It seems that the package g++-mingw-w64-x86-64 provides two executables:

  • x86_64-w64-mingw32-g++-posix: which uses posix
  • x86_64-w64-mingw32-g++-win32: which uses win32

Using the first executable should solve your issue.

Upvotes: 1

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