Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Date: Fri, 12 Jul 2002 15:54:24 +0400 From: egor duda Reply-To: egor duda Organization: deo X-Priority: 3 (Normal) Message-ID: <9975891676.20020712155424@logos-m.ru> To: Wolfgang Hesseler CC: cygwin@cygwin.com Subject: Re: Bug: BSS segment in COFF files In-Reply-To: <3D2EBFC2.6973@multimediaware.com> References: <3D2EA2E2.2881@multimediaware.com> <8772121004.20020712145134@logos-m.ru> <3D2EBFC2.6973@multimediaware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi! Friday, 12 July, 2002 Wolfgang Hesseler qv@multimediaware.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@logos-m.ru ICQ 5165414 FidoNet 2:5020/496.19 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/