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Date: Fri, 12 Jul 2002 15:54:24 +0400
From: egor duda <deo AT logos-m DOT ru>
Reply-To: egor duda <cygwin AT cygwin DOT com>
Organization: deo
X-Priority: 3 (Normal)
Message-ID: <9975891676.20020712155424@logos-m.ru>
To: Wolfgang Hesseler <qv AT multimediaware DOT com>
CC: cygwin AT cygwin DOT com
Subject: Re: Bug: BSS segment in COFF files
In-Reply-To: <3D2EBFC2.6973@multimediaware.com>
References: <3D2EA2E2 DOT 2881 AT multimediaware DOT com>
 <8772121004 DOT 20020712145134 AT logos-m DOT ru> <3D2EBFC2 DOT 6973 AT multimediaware DOT com>
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Hi!

Friday, 12 July, 2002 Wolfgang Hesseler qv AT multimediaware DOT com wrote:

>> If you run gcc with '--save-temps' flag, and then look into
>> 'yourfile.s' file, you'll see that uninitialized data is tagged as
>> "common" (using '.comm' directive) and is put to bss only by linker
>> when final executable is created. To turn this feature off, use
>> '-fno-common' flag when compiling your object file.

WH> This works, however only if the variables are non-static. If a 
WH> variable is static the .comm directive is still used.

.lcomm, to be precise.

That's easy to work around. Just add 'int dummy;' to your source
file compiled with gcc, and you have 4 bytes in bss section.
 
>> Not sure if it's all that needed to link gcc-produced object files
>> with watcom linker, though. For instance, for function 'func ()' gcc
>> uses _func as symbol name in object files while watcom uses 'func_'.

WH> The only problem is that some functions call external functions 
WH> like _log10. Is the cygwin1.dll source code of that function available?
WH> I did a quick search in CVS but couldn't find it.

They're from newlib. http://sources.redhat.com/newlib/

Again, i suppose Watcom runtime provide log10 function, but symbol is
probably named log10_ or log10, not _log10. And you also have to check
that calling conventions and 'float' and 'double' formats (if you're
using floats) are compatible if you want your modules to interoperate.

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19


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