XPost: linux.debian.ports.hurd   
   From: sthibault@debian.org   
      
   Control: severity -1 important   
      
   Hello,   
      
   Mattias Ellert, le dim. 22 févr. 2026 02:14:06 +0100, a ecrit:   
   > Severity: serious   
      
   Nope, serious bugs are only for release archs   
      
   > int main() {   
   >   std::condition_variable cv;   
   >   std::mutex mx;   
   >   std::unique_lock lk(mx);   
   >   cv.wait_for(lk, std::chrono::seconds(2));   
   > }   
   >   
   > $ g++ -o wait_for wait_for.cxx   
   > $ time ./wait_for   
   >   
   > real	0m2,002s   
   > user	0m0,001s   
   > sys	0m0,001s   
   >   
   > However, when compiled on GNU/Hurd (Debian porterbox exodar.debian.net)   
   > it hangs forever and must be forced to quit with ctrl-C.   
   >   
   > ellert@exodar:~$ g++ -o wait_for wait_for.cxx -pthread   
   > ellert@exodar:~$ ./wait_for   
      
   It looks like gcc is mixing monotonic and realtime clocks. Notably,   
   /usr/include/i386-gnu/c++/15/bits/c++config.h   
   shows   
      
   /* Defined if clock_gettime has monotonic clock support. */   
   /* #undef _GLIBCXX_USE_CLOCK_MONOTONIC */   
      
   /* Defined if clock_gettime has realtime clock support. */   
   /* #undef _GLIBCXX_USE_CLOCK_REALTIME */   
      
   These should get defined to 1.   
      
   Possibly that's because _POSIX_TIMERS is still defined to 0, I haven't   
   checked what we could be missing for defining it to 1, contribution   
   welcome.   
      
   Samuel   
      
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