What steps will reproduce the problem?

Using the following test sketch:
`

if defined(AVR_AT90CAN32) || \

defined(__AVR_AT90CAN64__) || \
defined(__AVR_AT90CAN128__)
    #define  CANMB_QUANTITY     15                     

elif defined(AVR_ATmega32C1) || \

  defined(__AVR_ATmega64C1__) || \
  defined(__AVR_ATmega16M1__) || \
  defined(__AVR_ATmega32M1__) || \
  defined(__AVR_ATmega64M1__)
    #define  CANMB_QUANTITY     6                       

else

 #error Unsupported CPU in avr_can.h

endif

void setup() {
Serial.begin(115200);

Serial.println(CANMB_QUANTITY);

}

void loop() {

}

`

What is the expected output? What do you see instead?

While compiling on an ATmega64M1 uC, the line "#error Unsupported CPU in avr_can.h" is reported by the compiler and compiling stops. As there was a match I do not expect to #else lines to be recognized.

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

Arduino IDE 1.6.7
Windows 7

Please provide any additional information below.

Additional testing, it seems the #if ... statements are being processed correctly, in that the ATmega64M1 uC was recognized and CANMN_QUANITY was set to 6. But then processing continues on and picked up the #error line.

And it seems it is only the #error that is incorrectly picked up. If I place other directives (e.g., some test #defines) in the #else area, processing seems to work correctly.