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[Explained] Prototype mismatching function - no warning?

 
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allenhuffman



Joined: 17 Jun 2019
Posts: 602
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[Explained] Prototype mismatching function - no warning?
PostPosted: Thu Jan 30, 2020 9:27 am     Reply with quote
Is there a way to enable a warning when something like this happens?

header file:
Code:
void foo(); // no return value


source file:
Code:
int16 foo() // returns an in16
{
   return 42;
}


A coworker had a mismatch in his code like this, and was getting a "Contact CCS" error and it wouldn't build. I tried to recreate that on my system, and don't get that error, but also don't get a warning.

When I use GCC, I crank up all the warnings. I'm not sure how to do that (if even possible) inside the CCS IDE.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ?

Using: 24FJ256GA106, 24EP256GP202 and 24FJ64GA002.

Last edited by allenhuffman on Thu Jan 30, 2020 9:35 am; edited 1 time in total
Ttelmah



Joined: 11 Mar 2010
Posts: 19619

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PostPosted: Thu Jan 30, 2020 9:32 am     Reply with quote
That won't give an error, unless the code tries to use the foo
function before it's declaration. It'll treat the prototype as being for
a different overloaded version of the function.
allenhuffman



Joined: 17 Jun 2019
Posts: 602
Location: Des Moines, Iowa, USA

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PostPosted: Thu Jan 30, 2020 9:33 am     Reply with quote
Ah, a difference because of the C++ stuff that has moved into C. That makes sense.

Is there any way to turn on "prototypes required" in this compiler?
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ?

Using: 24FJ256GA106, 24EP256GP202 and 24FJ64GA002.
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