Re: [Sdcc-user] ifdef and endif 's

[Brian T. <bri...@ya...>]

Hi,
You are correct that the code is being compiled in
everytime.

There are two forms of the #if precompile directives,
#ifdef/#ifndef and #if.

You are using the #ifdef which compiles in if the
variable is defined (no matter the value).  You have
defined it in every case.

Instead you want to use the simple #if:
#define DEBUG_WORK 1
#if DEBUG_WORK
    printf("blahblah");
#endif
or you could also say
#if DEBUG_WORK == 1

OR

#define DEBUG_WORK 0
#if !DEBUG_WORK
or
#if DEBUG_WORK == 0

The other fix to your code is to simply comment out
the #define line, then the #ifdef will work correctly
(the variable won't be defined so the test will return
false).

Hope this explains it,
Brian Tyler

--- roelof 't Hooft <ro...@it...> wrote:
> Hi,
> 
> I am trying to use #ifdef and #endif.
> I have defined a 'variable' like this at the very
> beginning
> of the source file, right after the #include's :
> 
> #define DEBUG_WORK 0
> 
> And somewhere in the source I have :
> 
> #ifdef DEBUG_WORK
>         printf("blahblah");
> #endif
> 
> 
> It doesn't matter if I set the #define DEBUG_WORK to
> 0,
> FALSE, false, 1, TRUE or true it still is included
> in the hex file.
> 
> #ifdef is only mentioned in the sdccman.html
> (node18, preprocessor)
> and nothing else or more.
> 
> Any clues to what I'm missing or doing wrong ?
> 
> I'm using sdcc 2.3.3, about a month old with these
> command line options :
> --model-small --code-loc 0x0000 --stack-loc 128
> --iram-size 0x80 --stack-auto
> 
> 
> 
> PS: this is part of the output when I try to compile
> the cvs checkout
> from this morning on debain linux :
> 
> gcc -Wall -pipe -ggdb -g -O2  -I. -I..
> -I../support/Util -c SDCCdebug.c -o SDCCdebug.o
> gcc -Wall -pipe -ggdb -g -O2  -I. -I..
> -I../support/Util -c cdbFile.c -o cdbFile.o
> gcc -Wall -pipe -ggdb -g -O2  -I. -I..
> -I../support/Util -c SDCClex.c -o SDCClex.o
> SDCC.lex:45: redefinition of `yylineno'
> <stdout>:334: `yylineno' previously defined here
> SDCC.lex:50: syntax error before "YY_PROTO"
> SDCC.lex: In function `stringLiteral':
> SDCC.lex:376: `yytext_ptr' undeclared (first use in
> this function)
> SDCC.lex:376: (Each undeclared identifier is
> reported only once
> SDCC.lex:376: for each function it appears in.)
> {standard input}: Assembler messages:
> {standard input}:5838: Error: symbol `yylineno' is
> already defined
> make[1]: *** [SDCClex.o] Error 1
> make[1]: Leaving directory `/home/roelofh/sdcc/src'
> make: *** [sdcc-cc] Error 2
> 
> I allready did 'make clean' and 'make realclean',
> same result.
> 
> 
> 
> --
> roelof 't Hooft
>
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