it must be -j because objcopy does not recognize --j option (any version of objcopy, not only avr, i check also MinGW and it has the same parameter)
c:\WinAVR-20071221\bin>avr-objcopy.exe
Usage: avr-objcopy.exe [option(s)] in-file [out-file]
Copies a binary file, possibly transforming it in the process
The options are:
-I --input-target <bfdname> Assume input file is in format <bfdname>
-O --output-target <bfdname> Create an output file in format <bfdname>
-B --binary-architecture <arch> Set arch of output file, when input is binary
-F --target <bfdname> Set both input and output format to <bfdname>
--debugging Convert debugging information, if possible
-p --preserve-dates Copy modified/access timestamps to the output
-j --only-section <name> Only copy section <name> into the output
--add-gnu-debuglink=<file> Add section .gnu_debuglink linking to <file>
-R --remove-section <name> Remove section <name> from the output
-S --strip-all Remove all symbol and relocation information
-g --strip-debug Remove all debugging symbols & sections
[cut]
c:\MinGW\bin>objcopy
Usage: objcopy [option(s)] in-file [out-file]
Copies a binary file, possibly transforming it in the process
The options are:
-I --input-target <bfdname> Assume input file is in format <bfdname>
-O --output-target <bfdname> Create an output file in format <bfdname>
-B --binary-architecture <arch> Set arch of output file, when input is binary
-F --target <bfdname> Set both input and output format to <bfdname>
--debugging Convert debugging information, if possible
-p --preserve-dates Copy modified/access timestamps to the output
-j --only-section <name> Only copy section <name> into the output
--add-gnu-debuglink=<file> Add section .gnu_debuglink linking to <file>
-R --remove-section <name> Remove section <name> from the output
-S --strip-all Remove all symbol and relocation information
-g --strip-debug Remove all debugging symbols & sections
--strip-unneeded Remove all symbols not needed by relocations
-N --strip-symbol <name> Do not copy symbol <name>
[cut]