Dean schrieb:
Hi guys,
I've been noticing some strange behaviour with my makefile arguments.
Firstly, LD.exe crashes when I use -mshort-calls with the --relax linker
option, but *only* if I *don't* use -ffunction-sections and --gc-sections. With
the latter two options enabled both -mshort-calls and --relax work just fine.
Secondly, -ffunction-sections and --gc-sections seems to throw away some of my
PROGMEM variables. I rely on a few PROGMEM variables being embedded into the
binary so I can later distinguish which version it was compiled from, similar
to:
char PROGMEM buildtime[] = __TIME__;
--gc-sections seems to remove this, although I thought it was only designed to
remove unused functions and not PROGMEM data. Is there a workaround to this?
--gc_sections removes all sections, that the linker thinks are unused.
Did you compile also with the -fdata-sections compiler switch?
The assembler symbol of buildtime is not modified by
-ffunction-sections, only by -fdata-sections.
I can also imagine a missing KEEP instruction in the linker script
Rolf
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