Compiler error with c++ templates using teensy platform only

[ktgilliam]

I can compile this code using gcc or the native platform in platformio, but I am getting an error when I build for the Teensy4.1:

template <typename T>
inline T saturate(T val, T lower, T upper)
{
   T val1 = val > lower ? val : lower;
   T val2 = val1 < upper ? val1 : upper;
   return val2;
}

int main()
{
    double v = 1.234;
    saturate(v, 0.0, 90.0);
    return 0;
}

The error I get is:
src/exec/MainExec.cpp: In function 'int main()': src/exec/MainExec.cpp:12:26: error: no matching function for call to 'saturate(double&, float, float)' saturate(v, 0.0, 90.0);

Expected behavior: the compiler to make all three arguments doubles.

Is this a bug with the teensy platform or with the compiler?

[PaulStoffregen]

I tried with Arduino IDE and it seems to work.

[PaulStoffregen]

However, it does fail if I use Teensy 3.2, where code is compiled with "-fsingle-precision-constant" option. This is the expected result with -fsingle-precision-constant.

Perhaps PlatformIO is incorrectly using -fsingle-precision-constant with Teensy 4.1? It is only supposed to be used with the older boards.

[blackketter]

Yup, it seems that -fsingle-precision-constant is used with all boards on platformio. I'll file a bug.

[valeros]

Thanks for reporting, should be fixed in the dev branch.