AVR-Chat

I ended up chasing a bug because I had not noticed that one out of sixteen compiles
in a rebuild issued warnings about implicit function declarations which, of course,
caused an invalid calling sequence to be emitted.  

I thought I had set up the compiler options to treat this as an error but apparently
not.

I've re-read the gcc manual and searched the web but I can't figure out what I'm
doing wrong.

The following compiler command (WinAVR 20200110):

avr-gcc.exe -mmcu=atmega32 -Wall -fms-extensions
-Werror-implicit-function-declaration -DF_CPU=14745600UL  -g  -std=c99
-I..\BC002_MultiTaskCB -IC:\FreeRTOSV6.1.0\Source\include
-IC:\FreeRTOSV6.1.0\Source\portable\GCC\ATMega323 -ICommon_include
-IC:\WinAVR-20071221\avr\include  -c TrackIn.c -o obj\Debug\TrackIn.o

Produces the following output:

TrackIn.c: In function 'TrackIn__XmitStatus':
TrackIn.c:41: warning: implicit declaration of function 'CAN_XmitNM'
TrackIn.c: In function 'TrackIn__Init':
TrackIn.c:242: warning: implicit declaration of function 'CAN_XmitObjectStart'

And did not generate an error.

It was my understanding that the "-Werror-implicit-function-declaration" compiler
option would cause the warning to be turned into an error even in the presence of
the "-Wall" option.  I also tried "-Werror=implicit-function-declaration" with no
success.

Any idea what I'm doing wrong?