ERROR: , 'cstdalign' file not found, running C++17

Question

I'm trying to run a piece of code in Visual Studio Code, on macOS Catalina. The code:

#include <bits/stdc++.h>
using namespace std;

int main() 
{ 
    // Create an empty vector 
    vector<int> vect;  
     
    vect.push_back(10); 
    vect.push_back(20); 
    vect.push_back(30); 
  
    for (int x : vect) 
        cout << x << " "; 
  
    return 0; 
} 

When I try to run the code using the coderunner extension, I get the error:

[Running] cd "/Users/VSC_Files/" && g++ -std=c++17 helloworld.cpp -o helloworld && "/Users/VSC_Files/"helloworld
In file included from helloworld.cpp:1:
/usr/local/include/bits/stdc++.h:57:10: fatal error: 'cstdalign' file not found
#include <cstdalign>
         ^~~~~~~~~~~
1 error generated.

[Done] exited with code=1 in 1.465 seconds

Apparently this is an error only for C++11, then why am I getting this error? I have the latest updated Xcode version and the latest stable build of VSCode too.

EDITED AND ADDED LATER

Also, I would like to add that I manually added the bits/stdc++.h file, and that it wasn't there from before.

Also, when I change g++ -std=c++17 to just g++ when running, the program runs and shows the correct output. With a warning as shown below.
helloworld.cpp:13:15: warning: range-based for loop is a C++11 extension [-Wc++11-extensions]

Is there an issue with the default C++ version in mt laptop? Please help!

Answer 1

#include<bits/stdc++.h> is an internal header for the GCC and you are not supposed to use it, it's not portable.

remvoe the #include<bits/stdc++.h> insted write #include<vector> and #include<iostream> also remove using namespace std it considered bad practice so you code shod look like this:

#include <vector>
#include <iostream>

int main() 
{ 
    // Create an empty vector 
    std::vector<int> vect;  
     
    vect.push_back(10); 
    vect.push_back(20); 
    vect.push_back(30); 
  
    for (int x : vect) 
        std::cout << x << " "; 
  
    return 0; 
} 

Answer 2

I was having the same issue. First I installed gcc via homebrew

brew install gcc

To avoid conflict with the existing gcc (and g++) binaries, homebrew names the binary suffixed with version. At time of this comment, the latest was gcc-10.

You dont have to copy the bits/stdc++.h after this. Just compile using g++-<major-version-number> instead of g++, which would use the homebrew installed binary instead of the default osx one. For me it is

g++-10 -Wall -O2 -std=c++11 test.cpp -o test

To check the binary name that homebrew installed you can look in the /usr/local/bin directory because thats where homebrew installs packages.

Also, make sure that usr/local/bin is before /usr/bin in your $PATH

Answer 3

I too got these error, and I solved these error by commenting out the <cstdalign> part.

After you comment out these line it will give 2 more errors - cuchar not found, and <memory_resources> not found, comment both of them using " //" . It will not harm you stdc++.h file . And it will definitely work.

Answer 4

For me it worked to comment the following lines out in the file bits/stdc++.h:

// #include <cstdalign>

...

// #include <cuchar>

The file is located in /usr/local/include/bits/ as well as in /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/bits. I don't know if you have to do it in both files but the first one worked for me!

---

Update Dec 24: If you use the g++ with the command line, there is no need to move any file into any directory!

For example when I use the command: g++ custom_file.cpp it works fine! In addition you can add -std=c++11 to have the most needed functions. Also I don't have to move the bits/stdc++.h file after Xcode get's an update.

I hope this helps!

Answer 5

I am sharing steps to execute with sample code for array rotation which works with following commands

g++-10 -Wall -O2 -std=c++11 rotatearrayusingdeque.cpp 

Then a.out file gets generated.

./a.out

sample code:

#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main() 
{
    int n,r,i,j,temp=0,n1;
    deque<int> v;
    cin>>n>>r;  
    for(i=0;i<n;i++)
    {
        cin>>n1;
        v.push_back(n1);
        
    }
    for(j=0;j<r;j++)
    {
        temp = v.front();
        v.pop_front();
        v.push_back(temp);
    }
    for(auto x:v)
    {
        cout<<x<<" ";
    }
    cout<<endl;

    return 0;
}

Now, there will not be any error, Thanks