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--- gdcc [2017/06/12 15:54] – korshun
+++ gdcc [2017/07/14 13:18] (current) – korshun
@@ Line 1: / Line 1: @@
+{{tag>acs_compilers}}
 ====== GDCC ======
-GDCC is an alternative ACS compiler.
+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.
-**ZDoom forums:** https://forum.zdoom.org/viewtopic.php?f=19&t=32078
-**GitHub:** https://github.com/DavidPH/GDCC

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