CODEWITHSUNDEEP
windowsc++11g++
Lexandro
Lexandro

Reputation: 57

Compiling within the code with g++ in Code::Blocks

I am trying to write a game similar to code hunt (https://www.codehunt.com/about.aspx) So How this will work, is the player can modify a .cpp file, which will be compiled and and ran within the code, but I have problems about how to compile it. I'am using the latest g++ compiler, and this is how I try to achive this:

void Builder::build(const char* file){
 std::string s = "g++ ";
 s += file;
 s += " -o test.o";
 system(s.c_str());
}

Where we get the .cpp file's name, and this code piece is supposed to build test.o This is just a test now, it might get more complex, I just wanted to test if the compiler will work within the code, but I get this error message when I try to run this:

c:/mingw/bin/../lib/gcc/mingw32/4.9.3/../../../libmingw32.a(main.o):(.text.startup+0xa7):undefined reference to 'WinMain@16'
collect2.exe: error: ld returned 1 exit status

PATH for mingw is set correctly, I checked. I am using Windows 8.1, g++ 4.9.3 and Code::Blocks.

Upvotes: 0

Views: 164

Answers (2)

Lexandro
Lexandro

Reputation: 57

OK I'm an idiot, so the problem was that I was trying to build a file whitout a main function. This was deliberat design choice at first, but...well yeah. Sorry about that. Thank you Joachim Pileborg for leading me to it.

Upvotes: 0

Some programmer dude
Some programmer dude

Reputation: 409384

In Windows execution doesn't normally start at the main functions, it starts at the WinMain function, which takes some Windows-specific arguments. You should read e.g. this WinMain reference for more information.

That some programs still seems to start at a main function is because there is an object file linked with the program that contains the WinMain function which calls your main function.

Upvotes: 1

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