[avr-gcc-list] eeprom.h error: cast from 'const uint8_t*' to 'uint8_t' loses precision in c++

[Bob Paddock]

I was starting a new project and wanted to do it in C++, mostly to get
the better type checking.  I'm aware of the C++ caveats in the FAQ/Manual.

However I did not get very far before I ran into an error:

g:/winavr-20081205/lib/gcc/../../avr/include/avr/eeprom.h:
 In function 'uint8_t eeprom_read_byte(const uint8_t*)':

g:/winavr-20081205/lib/gcc/../../avr/include/avr/eeprom.h:199:
 error: cast from 'const uint8_t*' to 'uint8_t' loses precision

Are the standard AVR headers not c++ safe or am I doing something
wrong?  The same example program, below, compiles without error as
normal C code.

Full sepal:
-------- begin --------
avr-gcc (WinAVR 20081205) 4.3.2
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiling C++: Main/main.cpp

avr-gcc -c -mmcu=attiny88 -I. -x c++ -gdwarf-2 -DF_CPU=8000000UL
 -Os -funsigned-char -funsigned-bitfields
 -fpack-struct -fshort-enums -fno-exceptions
 -Wall -Wundef -Wa,-adhlns=LT_A_OBJs/Main/main.lst
  -MMD -MP -MF .dep/main.o.d Main/main.cpp -o LT_A_OBJs/Main/main.o

In file included from Main/main.cpp:7:

g:/winavr-20081205/lib/gcc/../../avr/include/avr/eeprom.h:
 In function 'uint8_t eeprom_read_byte(const uint8_t*)':

g:/winavr-20081205/lib/gcc/../../avr/include/avr/eeprom.h:199:
 error: cast from 'const uint8_t*' to 'uint8_t' loses precision

make[1]: *** [LT_A_OBJs/Main/main.o] Error 1
make[1]: Leaving directory `G:/BKU/Projects/LITETR~2/SOURCE~1'
make: *** [all] Error 2
-------- end --------

Example program, same results without the _cplusplus guards
as well:

-------- begin --------
#if defined(__cplusplus) && __cplusplus
 extern "C" {
#endif

#include <avr/io.h>
#include <avr/eeprom.h>

#if defined(__cplusplus) && __cplusplus
 }
#endif

int main( void ) __attribute__ ((OS_main));
int main( void )
{
  for(;;)
    ;
}
-------- end --------