Hello !

I am using Code Sourcery's GNU toolchain to code for the LXPXpresso 
LPC1769 board.
Just a word before you think I understand more than I do : this is my 
first step outside of the arduino world ( after a few days in the mBed 
world ).
So I'm trying to code for it in C++. A simple "blinking" example works 
ok.
But when I try to do oop, and use the "new" keyword, the program's size 
explodes : 

Without the "new" keyword : 

1

arm-none-eabi-size main.elf

2

   text     data      bss      dec      hex  filename

3

    768        8        8      784      310  main.elf

With the "new" keyword : 

1

arm-none-eabi-size main.elf

2

   text     data      bss      dec      hex  filename

3

  82264     1424     2136    85824    14f40  main.elf

That's a lot of flash usage for just a small keyword. A similar test in 
the mBed online compiler gives no visible difference ( it rounds code 
size to kilobytes ) between using new or not using it.

So I have googled quite a lot about this. The most usefull command I 
have found is this : 

1

arm-none-eabi-nm --demangle --print-size --size-sort --reverse-sort -S main.elf

2

00003400 00005202 t d_print_comp

3

0000d190 00001640 T _svfprintf_r

4

00008604 00000ede t d_print_mod

5

0000eb2c 00000eba T _dtoa_r

6

00010db4 00000ae0 T _svfiprintf_r

7

100005a8 00000800 b emergency_buffer

8

00001ad8 0000071c t d_type

9

000094e4 00000696 t d_print_mod_list

10

0000bd18 0000057a T _malloc_r

11

0000298c 00000544 t d_encoding

12

0000c790 0000041c T _realloc_r

13

10000100 00000408 D __malloc_av_

14

etc ...

So it looks like using the new keyword also gets printf and other space 
consuming things into the program. I don't want it to do that, that's 
stupid.
It seems like there are two reasons why it would do that ( from what I 
have googled, I understand like 3% of it ) : 

1. Maybe it puts all of libstdc++ into the program, and does not delete 
what is not needed.
But the makefile does -ffunction-sections at compilation and 
--gc-sections at linking, and from what I have understood if you do that 
useless stuff gets discarded. So either --gc-sections does not work, or 
that's not the problem.

2. Maybe it includes code for "exceptions", which from what I understand 
( probably wrong ) is like runtime errors or something. So it would make 
sense it needs printf to report errors ... The problem is that in my 
makefile I have -fno-exceptions. So either -fno-exceptions does not work 
correctly, or it is not the problem ...

This is as far as I was able to go with my knowledge and google ...
I am attaching a zip of the project ( it's like a frankeinstein 
creature, with bits of everything I was able to find on the internet, 
please don't mock it ).

I would be extremely gratefull for any help in getting the code size to 
a reasonable size.
Thank you very much in advance for your help !

Arthur.