Build failure with STM32 Blue Pill board

[ukoda]

When I try to build with version 4.4.0 for a STM32F103C8 Blue Pill board I get the error:

Compiling .pio/build/bluepill_f103c8/lib6e0/Ticker/Ticker.cpp.o
In file included from src/main.cpp:19:0:
.pio/libdeps/bluepill_f103c8/Ticker/Ticker.h:56:7: error: expected nested-name-specifier before 'fptr'
 using fptr = std::function<void()>;

Followed by the normal errors you would expect after that.

The problem may be at line 54 of Ticker.h, #if defined(__arm__) || defined(ESP8266) || defined(ESP32). I changed that area to just typedef void (*fptr)(); and then everything builds and runs ok.

I have not dug any deeper as that change is enough to keep me going but I figured you may wish to review the issue so it does not catch other people out.

If you need more detail just let me know what.

[sstaub]

Maybe this is a problem with the compiler version for the Blue Pill.

[ukoda]

@sstaub That is quite likely as I also see the warning:

In file included from src/main.cpp:19:0:
.pio/libdeps/bluepill_f103c8/Ticker/Ticker.h:153:28: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11 [enabled by default]
  resolution_t resolution = MICROS;

I'm building under PlatformIO with the Arduino frame work. The terminal output doesn't show what compiler version it is using and I can't see where to find that info in the project settings.