SAS/C 6/58 printf() no prototype

[Inner200k]

I do not understand;

#include <stdio.h>

int main() {
printf("Hello World\n");
return 0;
}

Results in

SAS/C Amiga Compiler 6.58
Copyright (c) 1988-1995 SAS Institute Inc.

====================
   printf[(]"Hello World\n"); print.c 4 Warning 100: no prototype declared for function "printf"

Slink - Version 6.58
Copyright (c) 1988-1995 SAS Institute, Inc.  All Rights Reserved.
SLINK Complete - Maximum code size = 7560 ($00001d88) bytes
Final output file size = 7568 ($00001d90) bytes

I've used [ & ] to illustrate where the highlighted cursor is pointing to in the error log.

Code this simplistic shouldn't produce this error and I'm trying to fix it before I do anything more meaningful, it should be said that the code at least on my system runs and works as expected regardless of the prototype error, however warnings can often be an indication that something is wrong and can lead to problems in time.

[Samurai_Crow]

It's just a warning that you aren't checking the return code of printf().

[Docent]

Originally Posted by Samurai_Crow

It's just a warning that you aren't checking the return code of printf().

This is incorrect - checking for types of return values on prototypes is performed when there is an explicit assignment of a return value to a variable, otherwise the check is ignored and no warning is generated.

Such warning appears when compiler cannot find the correct prototype for a function - perhaps the included stdio.h file is incorrect or damaged.
I compiled this code on my amiga and i did not get any warning.

[freakofnature]

deleted!
i checked if a wrong assignment could cause that, but then no executable will be build.
i'm sure, i encountered this in the past as well.

[rkidd7952]

The compiler might be finding an unexpected file named stdio.h in its header search path. Try running only the preprocessor (sc pponly print.c), then check the output.

Robert

[Inner200k]

Originally Posted by Docent

This is incorrect - checking for types of return values on prototypes is performed when there is an explicit assignment of a return value to a variable, otherwise the check is ignored and no warning is generated.

Such warning appears when compiler cannot find the correct prototype for a function - perhaps the included stdio.h file is incorrect or damaged.
I compiled this code on my amiga and i did not get any warning.

kind of what I thought too when reading your comments that it was incorrect, although when I first saw the error I simply thought this is by no means normal behaviour for a freshly installed AmigaOS 3.1.4 & SASC 6.58 to behave at all, it's still spewing out those errors it's now at a stage where it's inhibiting me from being able to see actual errors in my code.

I checked my stdio.h to see if was corrupted, hoping it wasn't there and ... it is just as it has always been for decades lol.

stdio.h
extern int printf(const char *, ...);

Just spitballin here, couldn't be because of an updated os?
Am I missing a required .lib? -- according to snoopdos maybe an issue with sc.lib ?
maybe a compiler option? I'm using "sc <sourcefile> link <outputfile>" ?

[modrobert]

I get no warning when compiling your source code using 'sc hello_world.c'.

How does your SAS/C assigns look (check with 'assign' in shell)?

In my s:Startup-Sequence (actually User-Startup in my case) the following lines were added:

;BEGIN SAS/C
assign sc: sys:programs/sasc
assign lib: sc:lib
assign include: sc:include
assign cxxinclude: sc:cxxinclude
path sc:c add
;END SAS/C

[Inner200k]

Originally Posted by modrobert

I get no warning when compiling your source code using 'sc hello_world.c'.

How does your SAS/C assigns look (check with 'assign' in shell)?

In my s:Startup-Sequence (actually User-Startup in my case) the following lines were added:

;BEGIN SAS/C
assign sc: sys:programs/sasc
assign lib: sc:lib
assign include: sc:include
assign cxxinclude: sc:cxxinclude
path sc:c add
;END SAS/C

Mine looks simular

Assign >NIL: SC: Sys:Tools/sasc658/sc
Assign >NIL: LIB: SC:lib

Assign >NIL: INCLUDE: SC:netinclude <--- maybe swap these around
Assign >NIL: INCLUDE: SC:include ADD <--- maybe swap these around.

Assign >NIL: NETINCLUDE: SC:netinclude
Assign >NIL: CXXINCLUDE: sc:cxxinclude

[Inner200k]

I fixed up my assigns ... that was the issue! goodness.