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extern millis declaration #84
Description
I get the follow error with later versions of TaskScheduler/esp:
In file included from lib/painlessMesh/src/painlessMeshConnection.h:6:0,
from lib/painlessMesh/src/painlessMeshConnection.cpp:9:
/root/.platformio/lib/TaskScheduler_ID721/src/TaskSchedulerDeclarations.h:48:22: error: previous declaration of 'long unsigned int millis()' with 'C++' linkage
extern unsigned long millis(void);
^
In file included from /root/.platformio/packages/framework-arduinoespressif8266/libraries/ESP8266WiFi/src/WiFiClient.h:25:0,
from /root/.platformio/packages/framework-arduinoespressif8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h:39,
from lib/painlessMesh/src/painlessMeshConnection.h:11,
from lib/painlessMesh/src/painlessMeshConnection.cpp:9:
/root/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/Arduino.h:187:26: error: conflicts with new declaration with 'C' linkage
unsigned long millis(void);
^
In file included from lib/painlessMesh/src/painlessMeshConnection.h:6:0,
from lib/painlessMesh/src/painlessMeshConnection.cpp:9:
/root/.platformio/lib/TaskScheduler_ID721/src/TaskSchedulerDeclarations.h:47:22: error: previous declaration of 'long unsigned int micros()' with 'C++' linkage
extern unsigned long micros(void);
^
In file included from /root/.platformio/packages/framework-arduinoespressif8266/libraries/ESP8266WiFi/src/WiFiClient.h:25:0,
from /root/.platformio/packages/framework-arduinoespressif8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h:39,
from lib/painlessMesh/src/painlessMeshConnection.h:11,
from lib/painlessMesh/src/painlessMeshConnection.cpp:9:
/root/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/Arduino.h:188:26: error: conflicts with new declaration with 'C' linkage
unsigned long micros(void);
^
*** [.pio/build/nodemcuv2/lib771/painlessMesh/painlessMeshConnection.cpp.o] Error 1
I assume this would be solved by wrapping them as follows in the TaskSchedulerDeclarations file (but have not tested this).
extern "C"
{
unsigned long micros(void);
unsigned long millis(void);
}
Activity
arkhipenko commentedon Jan 16, 2020
Would it also help if I moved this declaration into TaskScheduler.h file, which must only be included once?
TD-er commentedon Jan 16, 2020
declare it using extern in a .h file and implement it in only a single .cpp file.
Something like this...
some.hfile:some.cppfile:This allows the .h file to be included as much as you like.
The same for (global) variables.
Declare as extern and construct in only a single .cpp file.
arkhipenko commentedon Jan 16, 2020
I can't have any .cpp files in the library due to the way Arduino IDE handles external
#definestatements...arkhipenko commentedon Jan 17, 2020
Could you please check if the version I just pushed into "testing" branch solves the issue?
Thx
theOtterWizard commentedon Jan 17, 2020
I had the same issue but the testing branch version solved the compilation errors for me.
arkhipenko commentedon Jan 17, 2020
Pushed into master as 3.1.2
BlackEdder commentedon Jan 20, 2020
Thank you this has now been solved.