Assembly files not working with newer gcc, -assembler-with-cpp option does not exist?

[matthijskooijman]

No description provided.

[matthijskooijman]

When trying to compile a .S file (just drop an empty .S file in any
library you are using) with 1.5.x from git using a newer avr-gcc
(4.8.something), I get:

avr-gcc -c -g -assembler-with-cpp -mmcu=atmega256rfr2 -DF_CPU=16000000L -DARDUINO=155 -DARDUINO_PINOCCIO -DARDUINO_ARCH_AVR -D__PROG_TYPES_COMPAT__ -I/home/matthijs/docs/Electronics/Arduino/Arduino-1.5/build/linux/work/hardware/arduino/avr/cores/arduino -I/home/matthijs/docs/Electronics/Arduino/hardware/pinoccio/avr/variants/pinoccio -I/home/matthijs/docs/Electronics/Arduino/libraries/DHT -I/home/matthijs/docs/Electronics/Arduino/libraries/DHT/utility /home/matthijs/docs/Electronics/Arduino/libraries/DHT/Asm.S -o /home/matthijs/docs/Electronics/Pinoccio/library-gainspan-s2w/examples/GSClientTLS/build/DHT/Asm.S.o 
avr-gcc: error: unrecognized command line option ‘-assembler-with-cpp’

This option comes from https://github.com/arduino/Arduino/blob/ide-1.5.x/hardware/arduino/avr/platform.txt#L20

I can't find any documentation of this option, but it seems that it has
been dropped in newer version. From newere documentation, it seems that
-x assembler-with-cpp is supposed to replace this option. Testing
shows that the -x version is also supported by the Arduino-bundled
4.3.2 version:

/home/matthijs/docs/Electronics/Arduino/Arduino-1.5/build/linux/work/hardware/tools/avr/bin/avr-gcc -c -g -assembler-with-cpp -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=155 -DARDUINO_AVR_ADK -DARDUINO_ARCH_AVR -I/home/matthijs/docs/Electronics/Arduino/Arduino-1.5/build/linux/work/hardware/arduino/avr/cores/arduino -I/home/matthijs/docs/Electronics/Arduino/Arduino-1.5/build/linux/work/hardware/arduino/avr/variants/mega -I/home/matthijs/docs/Electronics/Arduino/libraries/DHT -I/home/matthijs/docs/Electronics/Arduino/libraries/DHT/utility /home/matthijs/docs/Electronics/Arduino/libraries/DHT/Asm.S -o /home/matthijs/docs/Electronics/Pinoccio/library-gainspan-s2w/examples/GSClientTLS/build/DHT/Asm.S.o 

Would it make sense to just switch to the -x version to increase
future-proofness?

[b-rohit]

I compiled a arduino mavlink sketch from https://github.com/alaney/arduino-mavlink in 1.8.1 and 1.8.2. and i got the same error.

Arduino: 1.8.2 (Windows 10), Board: "Arduino/Genuino Uno"

In file included from E:\Dw\arduino-mavlink-master\ArduinoMAVLink\ArduinoMAVLink.ino:2:0:

C:\Users\Rohit\Downloads\arduino-PR-5863-BUILD-637-windows\arduino-PR-5863-BUILD-637\libraries\FastSerial/FastSerial.h:47:3: error: #error Must include FastSerial.h before the Arduino serial driver is defined.

error Must include FastSerial.h before the Arduino serial driver is defined.

^
exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

[matthijskooijman]

@b-rohit, huh? This does not seem to be related to this particular issue either. Are you having trouble creating a new issue, or?