Echelon NodeBuilder Errors 3120 User Manual download pdf (Page 44)

5-24 Neuron C Compiler Errors (NCC)

NCC# Description

179 Incorrect use of ‘void’ in function prototype [NCC#179]

The void type has no size. It cannot be used as an argument of the

sizeof operator, nor can it be used to declare a variable. Its only

legal uses are in declaring function return types, declaring that a

function has no parameters, and in combination with * to define a

type void * (a wildcard pointer type).

180

Function parameter may not be ‘struct’ or ‘union’ type

[NCC#180]

Neuron C does not support passing struct or union types by value

as function parameters. You may use a pointer to the structure or

union as a function parameter.

181 Function declarations must use prototypes [NCC#181]

Neuron C is more restrictive than ANSI C in this area. The Neuron

Chip's

stack machine architecture does not permit calling undeclared

functions with unknown numbers of parameters.

182 No declaration for formal parameter - int assumed [NCC#182]

The definition of ANSI C permits a declaration at file scope without a

type. Likewise, functions may be declared without a return type.

Also, it is possible to construct a typecast that does not actually

contain a type. Such declarations must default to int, by the ANSI C

definition. However, such declarations are poor programming

practice, and may even indicate an error, thus the compiler issues a

warning diagnostic.

Consider the following example:

unsigned long x1, x2; x3;

Note the semicolon following x2. This is most likely a typo, however,

ANSI C permits this and results in x3 being declared by default as

an int. Due to white space rules, this appears the same to the

compiler as the following declaration:

unsigned long x1, x2;

x3;

This is almost certainly not what the programmer intended, yet most

C compilers do not issue a warning in these circumstances.

183

Mixing function prototypes and old-style parameter list not

allowed [NCC#183]

This diagnostic results from a declaration of the form:

void f(int a, b) int b; { <fn body> }

Use only new-style ANSI C function declaration syntax:

void f(int a, int b) { <fn body> }

or old-style (traditional) C function declaration syntax:

void f(a,b) int a; int b; { <fn body> }

Do not intermix these two styles within a single function definition.

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