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
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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.
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