URL: <http://savannah.nongnu.org/bugs/?50811>
Summary: using -Wl,-u,vfprintf -lprintf_min causes program to grow a lot Project: AVR C Runtime Library Submitted by: None Submitted on: Sat 15 Apr 2017 11:38:22 PM UTC Category: None Severity: 3 - Normal Priority: 5 - Normal Item Group: None Status: None Percent Complete: 0% Assigned to: None Originator Email: britton.ke...@gmail.com Open/Closed: Open Discussion Lock: Any Release: 2.0.0 Fixed Release: None _______________________________________________________ Details: The documentation seems to be saying that using those flags is supposed to save flash, but without them, a main() that does a single printf("foo\n"); gives me a 330 byte flash, while with them I get a 1330 byte flash. If I remove the printf() call, I get flash sizes of 1228 or 228 with or without the above mentioned printf-min flags, respectively. It looks like somehow the printf-min flag ends up dragging in a bunch extra code somehow? The rest of my linker invocation looks like this: avr-gcc -mmcu=atmega328p -lm -Wl,-gc-sections -Wl,-Map=program_to_upload.out.map -o program_to_upload.out main.o I think probably the documentation ought to mention this possibility, assuming it isn't a bug. _______________________________________________________ Reply to this item at: <http://savannah.nongnu.org/bugs/?50811> _______________________________________________ Message sent via/by Savannah http://savannah.nongnu.org/ _______________________________________________ AVR-libc-dev mailing list AVR-libc-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-libc-dev