Re: Can I get rid of C libraries dependencies?

[Leff Ivanov <droiddermo@gmail.com>]

среда, 16 сентября 2015 г., 19:13:11 UTC+3 пользователь Simon Wright написал:
> Leff Ivanov <droiddermo@gmail.com> writes:
> 
> > What I want to achive is a tiny 2kb binary executable 
> 
> Can you tell us a little more about why you need to do this, what OS
> you're using ...

I'm using windows and want to write tiny tools in Ada like I can 
write one in C/C++ using -nostdlib flag and directly linking to
OS specific libraries. The same can be applied to Linux and Mac
OSX as well, but currently I'm focusing on Windows.

If I do "gnatmake -a -f -nostdlib main.adb" I can see that GNAT
actually recompiles a lot of stuff from RTS, like a-except.adb,
s-secsta.abd and etc. So the No_Run_Time pragma cuts off only
a part of Ada RTS, but leaves the rest.

Gnatlink tool with -nostdlib returns a lot of undefined references
to C code, which I want to get rid off. It seems that mostly it is
functions that implements exceptions, like _Unwind_SjLj_Register,
__gnat_personality_sj0 and etc. 

Undefined references to stuff like memmove and memcmp I can simply
fix by linking directly with libmsvcrt.a, so theese functions would
be taked from standard windows msvcrt.dll library. But there's also 
undefined reference to __chkstk_ms, this function seem to check if 
the stack is full. This function is MinGW specific and there is no implementation in standard windows libraries.