CCS C Compiler Manual PCB / PCM / PCH

COMPILER WARNING MESSAGES
Compiler Warning Messages
#error/warning
Assignment inside relational expression
Although legal it is a common error to do something like if(a=b) when it was intended to do
if(a==b).
Assignment to enum is not of the correct type.
This warning indicates there may be such a typo in this line:
Assignment to enum is not of the correct type
If a variable is declared as a ENUM it is best to assign to the variables only elements of the
enum. For example:
enum colors {RED,GREEN,BLUE} color;
...
color = GREEN; // OK
color = 1; // Warning 209
color = (colors)1; //OK
Code has no effect
The compiler can not discern any effect this source code could have on the generated code.
Some examples:
1;
a==b;
1,2,3;
Condition always FALSE
This error when it has been determined at compile time that a relational expression will never be
true. For example:
int x;
if( x>>9 )
Condition always TRUE
This error when it has been determined at compile time that a relational expression will never be
false. For example:
#define PIN_A1 41
...
if( PIN_A1 ) // Intended was: if( input(PIN_A1) )
Function not void and does not return a value
Functions that are declared as returning a value should have a return statement with a value to
be returned. Be aware that in C only functions declared VOID are not intended to return a value.
If nothing is specified as a function return value "int" is assumed.
Duplicate #define
The identifier in the #define has already been used in a previous #define. To redefine an
identifier use #UNDEF first. To prevent defines that may be included from multiple source do
something like:
#ifndef ID
#define ID text
#endif
Feature not supported
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