{{tag>acs_compilers}}
====== GDCC ======
GDCC is an alternative ACS compiler, and also a standards-compliant compiler of the [[wp>C programming language]] to ACS VM bytecode.

The ACS compiler part of GDCC is called **GDCC-ACC**. The rest is the C compiler.

  * **ZDoom forums:** https://forum.zdoom.org/viewtopic.php?f=19&t=32078
  * **GitHub:** https://github.com/DavidPH/GDCC

===== Known bugs =====

==== Missing "return" statement executes random other function's code ====

<note warning>This bug is extremely hard to detect.</note>

<code>
function int f(void)
{
    DoSomething();
    // accidentally wrote "int" instead of "void"
    // This function will now proceed to some other random function's code
}
</code>

Functions that return a value but don't have "return" in the code **will execute some other random function's code** due to the compiler ignoring the missing return statement.

==== Functions without forward declarations can be called incorrectly ====

<code>
function void f(void)
{
    int x = g(1, 2, 3);
    print(d:x);
}

function void g(void)
{
    // This function does NOT return a value
    // and does NOT accept 3 arguments.
}
</code>

If a function is used before it's declared, GDCC allows ANY call to the function, unlike [[ACC]] and [[BCC]].

==== Compiler errors result in 0 bytes compiled ACS ====

Some fatal compiler errors do not result in an error message, but in a compiled ACS file that is 0 bytes long.

==== Incomprehensible compiler errors ====

''Bad gen Retn'' means that the name of the function is already used elsewhere.