Re: Compiling Lua for uClinux create larger file than expected

[Roland Illig <roland.illig@...>]

Mike Crowe wrote:
> Hi folks,
>
> This is most definitely my problem, but I'm trying to embed Lua in a 
> custom soft-core called NIOS.  I have it compiling fine (haven't tested 
> yet), but the size looks ridiculous.  Here's what I'm currently seeing 
> (under cygwin):
>
> MCrowe@MCrowe lua $ l lib
> total 128
> -rw-rw-rw-    1 MCrowe   mkpasswd   130638 Oct 19 21:59 liblua.a
> -rw-rw-rw-    1 MCrowe   mkpasswd    92316 Oct 19 21:59 liblualib.a
> MCrowe@MCrowe lua $ l bin
> total 395
> -rw-rw-rw-    1 MCrowe   mkpasswd   403948 Oct 19 21:59 lua
> MCrowe@MCrowe lua $
>
> I'm sure it's a compile/linker issue, but it is not intuitively 
> obvious.  Here's the flags:
>
> CC = nios2-elf-gcc -c -O2 -fomit-frame-pointer -pedantic -Wall  
> -I(...)/include -D__linux__ -I./include -I. -I..
> LDFLAGS = -Wl,-E -msys-crt0=(...)/crt0.o -r -d -L(...)/lib/ -lc
>
> Does anybody see anything flagrant that I am missing?

If you want to have a small size executable, use -Os (optimize for size) 
instead of (-O2).

Results on an i386-linux:

with MYCFLAGS="-O2":
 112686 liblua.a
  81348 liblualib.a
after stripping:
  78348 liblua.a
  48604 liblualib.a

with MYCFLAGS="-Os":
  95438 liblua.a
  68880 liblualib.a
after stripping:
  61448 liblua.a
  36096 liblualib.a

Roland