Follow-up Comment #1, patch #6352 (project avr-libc):
These functions modify RAMPZ register and is non-reenterable. They cannot
be used in interrupt handlers and pre-emptive Real Time OS. It should be
written in documentation.
Your comments on such offer:
Add in AVR GCC toolchain architectures for 128KB devices. Define
"__AVR_HAVE_RAMPZ__" macro and save RAMPZ register in interrupt handlers for
these devices.
Pro:
1. Safely use more 64KB data stored in FLASH.
2. Add xxxx_PF string functions in avr-libc.
3. In future add support of "far" pointer in avr-gcc.
Contra:
1. Longer prologue/epologue code in interrupt handlers (4 instructions + 1
byte stored in stack).
Anatoly.
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