Help building with Xenon

Troubleshooting
1

Hi all. Sorry if my post leaves out anything as I am still new to all of this, but I’ve been having a bit of an issue that has been a pain for me.

In file included from ../wiring/inc/spark_wiring.h:51:0,
                 from ./inc/application.h:40,
                 from c:/ProjectStuff/MyProject//src/main.cpp:2:
../wiring/inc/spark_wiring_cloud.h: In instantiation of 'static bool CloudClass::function(const T&, Types ...) [with T = char [9]; Types = {void (*)(String)}]':
c:/ProjectStuff/MyProject//src/main.cpp:222:42:   required from here
../wiring/inc/spark_wiring_cloud.h:194:25: error: no matching function for call to 'CloudClass::_function(const char [9], void (*&)(String))'
         return _function(name, args...);
                         ^
../wiring/inc/spark_wiring_cloud.h:197:17: note: candidate: static bool CloudClass::_function(const char*, int (*)(String)) <near match>
     static bool _function(const char *funcKey, user_function_int_str_t* func)
                 ^
../wiring/inc/spark_wiring_cloud.h:197:17: note:   conversion of argument 2 would be ill-formed:
../wiring/inc/spark_wiring_cloud.h:194:25: error: invalid conversion from 'void (*)(String)' to 'int (*)(String)' [-fpermissive]
         return _function(name, args...);
                         ^
../wiring/inc/spark_wiring_cloud.h:202:17: note: candidate: static bool CloudClass::_function(const char*, user_std_function_int_str_t, void*)
     static bool _function(const char *funcKey, user_std_function_int_str_t func, void* reserved=NULL)
                 ^
../wiring/inc/spark_wiring_cloud.h:202:17: note:   no known conversion for argument 2 from 'void (*)(String)' to 'user_std_function_int_str_t {aka std::function<int(String)>}'
../wiring/inc/spark_wiring_cloud.h:220:17: note: candidate: template<class T> static bool CloudClass::_function(const char*, int (T::*)(String), T*)
     static bool _function(const char *funcKey, int (T::*func)(String), T *instance) {
                 ^
../wiring/inc/spark_wiring_cloud.h:220:17: note:   template argument deduction/substitution failed:
../wiring/inc/spark_wiring_cloud.h:194:25: note:   mismatched types 'int (T::*)(String)' and 'void (*)(String)'
         return _function(name, args...);
                         ^
make[3]: *** [../build/module.mk:277: ../build/target/user/platform-14-m/MyProject/src/main.o] Error 1
make[3]: Leaving directory '/cygdrive/c/Users/Me/.particle/toolchains/deviceOS/0.8.0-rc.27/firmware-0.8.0-rc.27/user'
make[2]: *** [../../../build/recurse.mk:12: user] Error 2
make[2]: Leaving directory '/cygdrive/c/Users/Me/.particle/toolchains/deviceOS/0.8.0-rc.27/firmware-0.8.0-rc.27/modules/xenon/user-part'
make[1]: *** [../build/recurse.mk:12: modules/xenon/user-part] Error 2
make[1]: Leaving directory '/cygdrive/c/Users/Me/.particle/toolchains/deviceOS/0.8.0-rc.27/firmware-0.8.0-rc.27/main'
make: *** [C:\Users\Work\.particle\toolchains\buildscripts\1.2.0\Makefile:38: compile-user] Error 2
The terminal process terminated with exit code: 2

Does anyone have any even basic ideas on why this would be thrown? It doesn’t appear to have much to do with my own code but I haven’t been able to root it out. Thanks! I can include some of my code if needed but I have no idea where it is coming from so I didn’t include anything in this post.

2

The most important bit you left out is the actual code that produced that error list.

The first error message complains that you are using Particle.function() with a callback function that’s not compatible to what the function expects.
Re-read the docs for Paricle.function()

Pay special attention to the examples and compare to your own callback function signature.

3

Okay. Looks like I got it! During my changes, I switched the particle function I was using from returning an int to void. Seems to have fixed my problems! Thanks!!

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