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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: djgpp/libreadline bug? (cannot use backspace)
Date: Tue, 30 Mar 2010 17:51:17 -0700 (PDT)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

> P.S. GNU ld still links all *.o into the .EXE even if not used. I find
> that annoying. I was wondering why removing a #define and recompiling
> didn't shave any output size until I proved that.

Hm I think not. Look at libc.a which have about 850kB this would
produce much bigger helloworld.exe if all *.o from libc would be
linked. I observed that if you use one or more functions from x.o then
entire x.o is linked. But it doesn't matter if it's ar-packed in
library (group of *.o in .a) or separated. I know -ffunction-sections -
fdata-sections and use it on avr-gcc where I want spare every byte and
it helps. It also should work for DJGPP but it would require to
recompile libraries to utilize it.

BTW readline and ncurses increased size of my program from ~100kB - >
190kB (after strip & UPX) it seems to me high cost for a command line
history (I use only 2 functions readline and add_history). I also want
to add my commands completion - it looks a bit complicated I'm looking
for some simple examples. I though it would be enough to provide a
pointer on string array and readline would complette it but it seems
that I will have to write some functions for searching in array etc.
and readline will call them.