[avr-chat] upgrading winavr gives warning on PSTR

[Steve Franks]

We just changed to the latest winavr and we get:

"CmdHandlers.cpp:1933: warning: only initialized variables can be
placed into program memory area"

from:

"printf_P(PSTR("Pmc Revision:%s\n"), GlobalRev);"

and any other line that uses the PSTR macro.

FYI, we are using avr-g++, and it reports v4.2.2 and the latest winavr rev.

Steve
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