B4R Question ArduinoBLE lib wrapping EMPTY issue

[rwblinn]

Hi,

working to wrap the ArduinoBLE library to be used with an Arduino GIGA R1.

Getting this error when compiling a test sketch:

Basic\B4R\Objects\src\rCore.h:614:40: error: expected unqualified-id before ';' token 614 | static B4RString* EMPTY; | ^ In file included from C:...

I confirmed the issue is caused by a macro named EMPTY coming from the Arduino GIGA (mbed / Zephyr / CMSIS) core.
Undefining EMPTY in B4RDefines.h is not sufficient, because the macro is reintroduced per translation unit by the Arduino core.

The only robust fix is to undefine EMPTY locally in rCore.h:

// --- Fix macro collision with Zephyr / mbed ---
#ifdef EMPTY
  #undef EMPTY
#endif
static B4RString* EMPTY;

This keeps API compatibility and avoids renaming core symbols.

Another option would be to rename EMPTY to EMPTYSTR in rCore.h and rCore.cpp:

static B4RString* EMPTYSTR;

static B4RString be_empty;
B4RString* B4RString::EMPTYSTR = be_empty.wrap("");

Is there another solution for this instead modifying the B4R rCore?

 

[Erel]

Another option would be to rename EMPTY to EMPTYSTR in rCore.h and rCore.cpp:

This will not work without updating B4R as the compiler emits code referencing this variable. I will change this variable name in the next update. For now you will need to modify rCore.h.