avr-gcc: error: language -assembler-with-cpp not recognized

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What steps will reproduce the problem?
1. Download Arduino IDE nightly
2. Install arduino-tiny hardware
3. Install BasicSerial library 
(http://nerdralph.blogspot.ca/2013/12/writing-avr-assembler-code-with-arduino.ht
ml)
4. Add BasicSerial to minimal sketch.
5. Verify

What is the expected output? 

BasicSerial library will compile.

What do you see instead?

/home/colinmc/Desktop/arduino-nightly/hardware/tools/avr/bin/avr-g++ -c -g -Os 
-w -fno-exceptions -ffunction-sections -fdata-sections -MMD -mmcu=attiny2313 
-DF_CPU=1000000L -DARDUINO=10600 -DARDUINO_AVR_ATTINY2313AT1 -DARDUINO_ARCH_AVR 
-I/home/colinmc/Arduino/hardware/tiny/avr/cores/tiny 
-I/home/colinmc/Arduino/libraries/BasicSerial 
/tmp/build3549687536994922447.tmp/sketch_jan22a.cpp -o 
/tmp/build3549687536994922447.tmp/sketch_jan22a.cpp.o 
/home/colinmc/Desktop/arduino-nightly/hardware/tools/avr/bin/avr-gcc -c -g -x 
-assembler-with-cpp -mmcu=attiny2313 -DF_CPU=1000000L -DARDUINO=10600 
-DARDUINO_AVR_ATTINY2313AT1 -DARDUINO_ARCH_AVR 
-I/home/colinmc/Arduino/hardware/tiny/avr/cores/tiny 
-I/home/colinmc/Arduino/libraries/BasicSerial 
-I/home/colinmc/Arduino/libraries/BasicSerial/utility 
/home/colinmc/Arduino/libraries/BasicSerial/BasicSerial.S -o 
/tmp/build3549687536994922447.tmp/BasicSerial/BasicSerial.S.o 
avr-gcc: error: language -assembler-with-cpp not recognized
avr-gcc: error: language -assembler-with-cpp not recognized

What version of the product are you using? On what operating system?

Arduino 1.6 nightly build 22 Jan 2015
Ubuntu 14.04
arduino-tiny-0150-0020.zip

Please provide any additional information below.

Tried adding "-x" to arduino-tiny's platform.txt, does not help.
Compiling with other boards (ATMEGA328 for example) works fine. Only fails to 
compile on any board supported by arduino-tiny.

Original issue reported on code.google.com by mcinn...@sasktel.net on 22 Jan 2015 at 4:48