How to speed up g++ during compile time
Fast compilation on g++ build systems is basically used in compiling and executing C++ programs in the terminal. There are many options to speed up the compilation or even slow it down. Some of them are as follows:
g++ {filename.cpp} -fconcepts:
Syntax:
g++ <filename.cpp> -fconcepts
Below is the C++ program to illustrate the use of -fconcepts:
C++
// C++ program to illustrate the use // of -fconcepts #include <bits/stdc++.h> using namespace std; // Function to print the integer a void print( auto a) { cout << a << endl; } // Driver Code int main() { int a = 5; // Function Call print(a); return 0; } |
Output:
Generally, functions do not allow an auto variable as function parameters. But using -fconcepts this error can be ignored.
g++ {filename.cpp} -Wall:
- Compiling the same code using -Wall will give warnings as it will not ignore it.
- It also prompts as to where the code is wrong.
Syntax:
g++ <filename.cpp> -Wall
Below is the C++ program to illustrate the use of -Wall:
C++
// C++ code to illustrate the use // of -Wall #include <iostream> using namespace std; // Function to print a void print( auto a) { cout << a << endl; } // Driver Code int main() { int a = 5; // Function call print(a); return 0; } |
Output: