Why is the c++ standard library not working?

问题

I've been trying to get my program that I downloaded from my schools server to run offline on my mac. I tried updating GCC by following tutorials and for some reason the tutorials didn't work even though I was using the commands given.

Now when I compile.. I get an error saying that is not found.. I don't get it. I've updated Xcode.. followed tons of tutorials.. and I still can't get the thing to run!

Why is it saying that random is not found, causing a fatal error?

Thanks

Error:

DungeonLevel.h:6:10: fatal error: 'random' file not found

"Since this is a coding site, I need to provide code because I probably forgot to include a header file..."

#ifndef _DungeonLevel_included_
#define _DungeonLevel_included_

#include "Tile.h"
#include <vector>
#include <random>

class Player;

class DungeonLevel {
public:
    DungeonLevel(int iWidth, int iHeight, std::mt19937 & randomGen);
    ~DungeonLevel(void);

    void dump();
    char at(int x, int y);

    Creature * removeCreature(Creature * creatureToRemove);

    void moveCreature(Creature * creatureToMove, char dir);
    void placeInGame(Creature * creatureToPlace, std::mt19937 & randomGen);
    void placeInGame(Creature & creatureToPlace, std::mt19937 & randomGen);
    Tile & returnTile(int x,int y);
    int getWidth();
    int getHeight();

private:
    std::vector<std::vector<Tile>> m_vvTiles; //Tile was char

};

#endif

Here's my makefile:

OBJECTS = Ammunition.o Armor.o Consumable.o Creature.o Entity.o Gold.o Item.o parser.o Potion.o Scroll.o Weapon.o XMLSerializable.o CreatureFactory.o DungeonLevel.o Player.o Tile.o ItemFactory.o
HEADERS = Ammunition.h Armor.h Consumable.h Creature.h Entity.h Gold.h Item.h parser.h Potion.h Scroll.h Weapon.h XMLSerializable.h CreatureFactory.h DungeonLevel.h Player.h Tile.h ItemFactory.h

all: Jhack

%.o: %.cpp $(HEADERS)
    clang++ -c $< -o $@ -std=c++11 -stdlib=libc++

Jhack: $(OBJECTS) main.o
    clang++ -o Jhack $^ -stdlib=libc++

clean:
    rm -f *.o Jhack

run: Jhack
    ./Jhack

回答1:

Apple's gcc is really outdated. Try to build using clang and libc++ instead of gcc and libstdc++. Compile flags: -std=c++11 -stdlib=libc++, link flag: -stdlib=libc++. Use clang++ instead of g++.

Edit: note that you need to install latest command line tools for this to work.
Open XCode. Go to "Xcode" -> "Preferences..." -> "Downloads" tab. Select "Command Line Tools" and install them. If it says that it is installed - check for updates by clicking on "Check and Install Now" button.
After that type clang++ --version in terminal and you should see something like next:

Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix

Edit 2: if that didn't help and you still have an outdated version of compiler. Try to use xcrun clang++ instead of clang++ in your makefile. That will use xcode toolchain.

来源：https://stackoverflow.com/questions/16229297/why-is-the-c-standard-library-not-working

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