template <typename Generic> can not compile with the lastedt version 1.6.8.

[EagleSmith]

template <typename Generic>
void DEBUG_WM(Generic text) {
  if (_debug) {
    Serial.print("*WM: ");
    Serial.println(text);
  }
}

it's working fine with Previous version(1.6.7)

[facchinm]

Hi @EagleSmith ,
I've tested IDE 1.6.7 with your example and it fails to compile, too. Can you give more hints? Like target board, verbose compilation output etc etc

[cmaglie]

just a blind guess, but could be that the function prototype spans over two lines?
What happens if you write:

template <typename Generic> void DEBUG_WM(Generic text) {
  if (_debug) {
    Serial.print("*WM: ");
    Serial.println(text);
  }
}

?

[nickgammon]

I was about to report something similar when I found this report. If you remove the line break it compiles OK. With the break, the preprocessed code is:

template <typename Generic> 
#line 4 "/tmp/arduino_modified_sketch_455371/sketch_jun04c.ino"
void DEBUG_WM(Generic text) ;
#line 11 "/tmp/arduino_modified_sketch_455371/sketch_jun04c.ino"
void setup();
#line 16 "/tmp/arduino_modified_sketch_455371/sketch_jun04c.ino"
void loop();
#line 4
void DEBUG_WM(Generic text) {
  if (_debug) {
    Serial.print("*WM: ");
    Serial.println(text);
  }
}

Arduino .ino file was:

bool _debug = true;

template <typename Generic> 
void DEBUG_WM(Generic text) {
  if (_debug) {
    Serial.print("*WM: ");
    Serial.println(text);
  }
}

void setup() { }
void loop() { }

Removing the #line directives the problem is it was expanded out to:

template <typename Generic> 
void DEBUG_WM(Generic text) ;
void setup();
void loop();
void DEBUG_WM(Generic text) {

The template line is not repeated. The prototype is OK, but the "real" function (definition) does not get the template line. The regexp or whatever-you-use to find a function declaration needs to allow for a line break in the declaration.

---

IDE 1.6.8 and 1.6.9.

[VioletGiraffe]

I confirm this is still present in 1.8.1. Uno R3 target.

[facchinm]

Should be solved by arduino/arduino-builder#182, @VioletGiraffe could you test it? Thx

[VioletGiraffe]

@facchinm : how can I test it? Sorry, I'm new around here :)
Apparently, I need to install Go and build the builder. Can I then use this new builder by replacing the "C:\Program Files (x86)\Arduino\arduino-builder.exe" with the new one?

[facchinm]

No problem 🙂 You don't need to install go, simply download the build produced by @ArduinoBot (http://downloads.arduino.cc/PR/arduino-builder/arduino-builder-182.zip) and replace the arduino-builder executable in the IDE installation folder with the correct one for your platform.

[VioletGiraffe]

Good to know! Yes, that indeed does solve the problem. Thanks.

[per1234]

I also confirm the issue is solved by arduino/arduino-builder#182 so I'm going to close this.

@EagleSmith if you test the arduino/arduino-builder#182 build and find that the problem still occurs please post a minimal complete sketch that demonstrates the problem in addition to the information requested at #4751 (comment) and I'll reopen.