gcc-newlib includes unwanted stuff

gcc-newlib includes unwanted stuff

[Gerhard Heinzel]

I am using  "h8300-hms-gcc" version 2.95.2 with
"newlib-1.8.1" to compile C programs for an embedded
application on the Hitachi 3048F processor (which includes on
the chip 4k RAM, 128k ROM and lots of useful functions).

newlib was configured as
./configure --host=i686-pc-linux-gnu --target=h8300-hms --norecursion 

I found that the library wastes a lot of memory for things
that I don't need:

- the standard initialization routine calls "_exit" which in
  turn calls "malloc". This is something I do neither need
  nor want, since it uses up a lot of my precious 4k RAM.
  Luckily I could easily get rid of that one by not calling
  "_exit" any more in "crt0.o". "exit" in my embedded
  application is achieved via the power switch.

However, another one I cannot get rid of so easily and that's
why I ask for help:

- I need some floating point routines (from fp-bit.o), and
  also one square root of a number which I know to be
  positive. The linker includes "errno.o" because of the
  "sqrt", and "errno.o" in turn includes "impure.o" which
  comes with a huge "static struct _reent
  __ATTRIBUTE_IMPURE_DATA__ impure_data" This structure takes
  more than 600 bytes, which is more than 16% of my total
  RAM.

How can I avoid linking this "impure.o" ?
Thanks for any hints,

Gerhard

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Re: gcc-newlib includes unwanted stuff

[Aaron J. Grier]

On Tue, May 30, 2000 at 11:25:16AM +0900, Gerhard Heinzel wrote:

> - I need some floating point routines (from fp-bit.o), and
>   also one square root of a number which I know to be
>   positive. The linker includes "errno.o" because of the
>   "sqrt", and "errno.o" in turn includes "impure.o" which
>   comes with a huge "static struct _reent
>   __ATTRIBUTE_IMPURE_DATA__ impure_data" This structure takes
>   more than 600 bytes, which is more than 16% of my total
>   RAM.
> 
> How can I avoid linking this "impure.o" ?
> Thanks for any hints,

couldn't you simply remove errno references from fp-bit?

-- 
  Aaron J. Grier   |   Frye Electronics, Tigard, OR   |   aaron@frye.com
  "The simplistic anthropomorphism which asserts that source code has a
   life separate from its creator or maintainer is the product of one
   too many viewings of Tron."  -- paraphrasing of anonymous post on /.

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