[gentoo-user] Can not compile arduino sketch after GCC upgrade

[Dan Johansson]

After upgrading GCC to 5.4.0 (from 4.9.3) I can no longer compile my
sketches.

At the end of the compile phase a get the following linker error:

avr-gcc -Os -Wl,--gc-sections -mmcu=atmega32u4 -o
/tmp/build881550966608502477.tmp/Blinky.cpp.elf
/tmp/build881550966608502477.tmp/Blinky.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/hsv2rgb.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/wiring.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/colorutils.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/colorpalettes.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/lib8tion.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/FastLED.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/bitswap.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/power_mgt.cpp.o
/tmp/build881550966608502477.tmp/FastLED313/noise.cpp.o
/tmp/build881550966608502477.tmp/core.a
-L/tmp/build881550966608502477.tmp -lm
/usr/libexec/gcc/avr/ld: cannot find crtatmega32u4.o: No such file or
directory
/usr/libexec/gcc/avr/ld: cannot find -latmega32u4
collect2: error: ld returned 1 exit status

And sure enough, there is not "crtatmega32u4.o" on this system (and only
one file with "atmega32u4" in the filename:
/usr/lib64/gcc/avr/5.4.0/device-specs/specs-atmega32u4).

I have tried to reinstall the avr-crossdev-toolchain:
crossdev -C avr
USE="-openmp -hardened -sanitize -vtv" crossdev -s4 -S --target avr
ln -s /usr/lib64/binutils/avr/2.26.1/ldscripts /usr/avr/lib/ldscript


And just to be sure I have also re-emerged:
dev-embedded/avrdude
dev-embedded/arduino

Any suggestions what I am missing?

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