Arduino 1.0 and Gentoo by Brendan Horan

It has been a while since I used my Arduino. Of course when I go to use it there is a new version of the software out 1.0. As expected it won't work out of the box on Gentoo. Make sure you give my existing article a read though if you have other issues.

I had to change two things.

I got the following error :

~/arduino-1.0/hardware/arduino/cores/arduino/Print.cpp: In member function ‘size_t Print::print(const __FlashStringHelper*)’:
~/arduino-1.0/hardware/arduino/cores/arduino/Print.cpp:44:9: error: ‘prog_char’ does not name a type
~/arduino-1.0/hardware/arduino/cores/arduino/Print.cpp:47:23: error: ‘p’ was not declared in this scope

It appears that Print.ccp is using depricated typedef. avr-libc v1.8.0 and up have deprecated the "prog_char" type def and now its recommended to use of "char PROGMEM".

So lets fix that... Open the the "Print.ccp" file for me this is located at :

~/arduino-1.0/hardware/arduino/cores/arduino/Print.cpp

On line 42 you will find the offending secion :

size_t Print::print(const __FlashStringHelper *ifsh)
{
 const prog_char *p = (const prog_char *)ifsh;
 size_t n = 0;
 while (1) {
 unsigned char c = pgm_read_byte(p++);
 if (c == 0) break;
 n += write(c);
 }
 return n;
}

Lets replace that section with one that supports new versions of avr-libc :

size_t Print::print(const __FlashStringHelper *ifsh)
{
 const char PROGMEM *p = (const char PROGMEM *)ifsh;
 size_t n = 0;
 while (1) {
 unsigned char c = pgm_read_byte(p++);
 if (c == 0) break;
 n += write(c);
 }
 return n;
}

After that I now got the following error :

/usr/libexec/gcc/avr/ld: cannot open linker script file ldscripts/avr5.x: No such file or directory

Hmm we've seen this shit before, check my existing article. Easy fix as root create the following symlink :

# ln -s /usr/x86_64-pc-linux-gnu/avr/lib/ldscripts /usr/avr/lib/ldscripts

Done. If your lucky it should work correctly now!