View source for ACC Incompatibility

While gdcc-acc is for the most part backwards-compatible with acc, there are a number of incompatibilities that will prevent ''some'' acc-centric code from compiling.

== Incorrectly typed arrays ==
In gdcc-acc, incorrectly typed arrays (for example, an array of strings using the type 'int') are not allowed.

<source lang=C>
int my_array[2] = { "Hello", "World" };
</source>

To fix this, use the correct type, <tt>str</tt>.

== Function prototypes ==
Like in acc, functions in gdcc-acc can be used before being declared. However, arguments will not have their types converted correctly.

<source lang=C>
script "forward_ref" (void)
{
    // Will log 0.25.
    sample_function(16384);
}

function void sample_function(fixed val)
{
    Log(f:val);
}
</source>

The solution to this is to either move the function above its first usage in the code, or add a function prototype before it is used, such as the following:

<source lang=C>
function void sample_function(fixed val);
</source>

== Script numbers ==
In gdcc-acc, a script number has to be an integer literal, not an expression. This applies even when using a macro.

<source lang=C>
#define ScriptFoo 1035
#define ScriptBuh ScriptFoo + 1

// OK
script ScriptFoo (void)
{
}

// ERROR: expected script-address got '('
// script ScriptBuh (void)
// {
// }
</source>

== Builtin functions ==
Unlike acc, gdcc-acc does not predeclare builtin ACS functions. The "zcommon.acs" header must be included even to use functions like Delay or Print.

== Extra keywords ==
In gdcc-acc, there are additional keywords, which cannot be used for object or function names.

As of v0.11.0, these are: enum, fixed, float, sizeof, and struct.