[Bug 2039895] [NEW] module complie error

[xwj]

Public bug reported:

//num.ixx

module;         //global module

//#incldue <> 	//lib not modularized
#include <bits/stdc++.h>
export module random:num;

//import                //module

//                              //non-export declaration

export
{
    inline int random_num(std::pair<int,int> range);
    inline int random_num(std::pair<int,int> range,int seed);

}

inline int random_num(std::pair<int, int> range)
{
    std::random_device rd; // 使用随机设备生成种子

    std::mt19937 gen(rd()); // 使用Mersenne Twister引擎
    
    std::uniform_int_distribution<int> dist(range.first , range.second); // 定义随机数范围

    return dist(gen);
}

inline int random_num(std::pair<int, int> range, int seed)
{
    std::mt19937 gen(seed); // 随机数引擎
    std::uniform_int_distribution<int> dist(range.first , range.second); // 定义随机数范围

    return dist(gen);
}


//random.ixx

module;         //global module

//#incldue <>   //lib not modularized

export module random;

//import 		//module
export import :num;
//				//non-export declaration

export
{
    void f()
    {}

}


//complie way

MODULE_FLAGS=-g -std=c++20 -fmodules-ts -x c++ -c
	g++ ${MODULE_FLAGS} num.ixx
	g++ ${MODULE_FLAGS} random.ixx 

//issue

1 . i dont know what happened since i add flag:-g
2 . before that , there still have issue :
 when i import random to use the function random_num(range) , when i step : std::random_device rd;
a error occasion from bit/string.h? but i cant formally use random_device in header system project?

** Affects: gcc-11 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2039895

Title:
  module complie error

Status in gcc-11 package in Ubuntu:
  New

Bug description:
  //num.ixx

  module;         //global module

  //#incldue <> 	//lib not modularized
  #include <bits/stdc++.h>
  export module random:num;

  //import                //module

  //                              //non-export declaration

  export
  {
      inline int random_num(std::pair<int,int> range);
      inline int random_num(std::pair<int,int> range,int seed);

  }

  inline int random_num(std::pair<int, int> range)
  {
      std::random_device rd; // 使用随机设备生成种子

      std::mt19937 gen(rd()); // 使用Mersenne Twister引擎
      
      std::uniform_int_distribution<int> dist(range.first , range.second); // 定义随机数范围

      return dist(gen);
  }

  inline int random_num(std::pair<int, int> range, int seed)
  {
      std::mt19937 gen(seed); // 随机数引擎
      std::uniform_int_distribution<int> dist(range.first , range.second); // 定义随机数范围

      return dist(gen);
  }



  //random.ixx

  module;         //global module

  //#incldue <>   //lib not modularized

  export module random;

  //import 		//module
  export import :num;
  //				//non-export declaration

  export
  {
      void f()
      {}

  }

  
  //complie way

  MODULE_FLAGS=-g -std=c++20 -fmodules-ts -x c++ -c
  	g++ ${MODULE_FLAGS} num.ixx
  	g++ ${MODULE_FLAGS} random.ixx 

  //issue

  1 . i dont know what happened since i add flag:-g
  2 . before that , there still have issue :
   when i import random to use the function random_num(range) , when i step : std::random_device rd;
  a error occasion from bit/string.h? but i cant formally use random_device in header system project?

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