Name mangling

[Claudio Bley]

>>>>> "Sune" == Sune Foldager <cryo@worldonline.dk> writes:

    Sune> Greetings, During my work on a kernel project for x86 based PC's,
    Sune> I have encountered a problem with the way the gcc compiller
    Sune> mangles/formats names into symbols for the linker. First time was
    Sune> when I switched from DOS djgpp, to Linux native gcc (RedHat,
    Sune> later Mandrake). Second time was today when I tried to compile my
    Sune> kernel under CygWin.

    Sune> The problem is that I use a number of assembler files to
    Sune> facilitate things like x86 instructions 'cli' and 'sti' and alot
    Sune> of other lowlevel stuff. Under DOS using djgpp, whenever I made a
    Sune> prototype like: void disable(); djgpp would produce a reference
    Sune> to the symbol '_disable', which I then also named my label in the
    Sune> assembler file (assembled using NASM). However, when I migrated
    Sune> to Linux, the same prototype produced and produces the symbol
    Sune> 'disable' without the underscore, requiering me to change all my
    Sune> assembler files.

    Sune> I have without success searched for options to change this
    Sune> behaviour of GCC.  The latest problem then is that under CygWin,
    Sune> the gcc compiller (which is the same or close to the same version
    Sune> as the one in my Linux), again mangles names like djgpp did, with
    Sune> the leading underscore.

    Sune> My question then is this: Is there any way to control how the
    Sune> symbols are generated, and is the behaviour even documented
    Sune> anywhere? I haven't been able to find either.

    Sune> Thanks alot in advance, Sune Foldager.

I don't think that there is a way of controlling how gcc generates symbols
(except of changing the source code), it is OS dependent AFAIK.

But you can define a macro (see attached file) and pass '-d<gensys>' to
nasm. Just %include "csym.inc", then you only need to define C symbols with
that macro (e.g. csym disable).

Claudio

-------------- next part --------------
%ifndef __csym_include__
%define __csym_include__

%macro csym 1

%ifdef WinNT
%define %1 _%1
%endif

%ifdef Win95
%define %1 _%1
%endif

%ifdef DOS
%define %1 _%1
%endif

%ifdef Linux
%define x x
%endif

%ifdef Linux_Alpha
%define x x
%endif

%endmacro

%endif