BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OMF vs. COFF objects          BorlandTalk.com Forum Index -> C++ Builder (Command Line Tools) View previous topic :: View next topic   Author Message Randy Stonesifer Guest Posted: Fri May 27, 2005 7:17 pm    Post subject: OMF vs. COFF objects I am porting a combined fortran and c program from unix to Windows. I am using the Compaq Visual FORTRAN compiler and BC++5.5.1(free command line version). The CVF uses the Microsoft COFF object file format. BC++ used OMF. The Microsoft LIB command will add the BC++ objects to a library with the CVF objects and gives the message that OMF is being converted to COFF. However, a CVF test program that tries to use the library is not able to resolve the references to the BC++ symbols. At http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/LNK4033.asp It says: "There are limitations to OMF to COFF conversions. OMF can represent some things that cannot be represented in COFF. If there are errors when the linker converts from OMF to COFF, then you will need to use COFF .obj files instead of OMF .obj files as input to the linker." Am I missing something simple or am I sc****d? Is there any way to generate COFF objects with the BC++5.5 I have? If not, is there another free c compiler that can generate COFF code? Thanks for any suggestions, Randy Back to top Darko Miletic Guest Posted: Fri May 27, 2005 10:49 pm    Post subject: Re: OMF vs. COFF objects Randy Stonesifer wrote: Quote: Am I missing something simple or am I sc****d? You are not missing anything. Quote: Is there any way to generate COFF objects with the BC++5.5 I have? No. Quote: If not, is there another free c compiler that can generate COFF code? Sure. Visual C++ Toolkit 2003. You can get it and use for free at this address: http://msdn.microsoft.com/visualc/vctoolkit2003/ Darko Back to top Randy Stonesifer Guest Posted: Fri Jun 03, 2005 4:45 pm    Post subject: Re: OMF vs. COFF objects After installing the Visual C++ Toolkit 2003, I found the same unresolved externals. This does not prove that the OMF to COFF conversion done by LIB worked, but strongly suggests that the unresolved externals were not due to the BC++ compiler's OMF objects. Back to top Bob Gonder Guest Posted: Fri Jun 03, 2005 7:17 pm    Post subject: Re: OMF vs. COFF objects Randy Stonesifer wrote: Quote: After installing the Visual C++ Toolkit 2003, I found the same unresolved externals. This does not prove that the OMF to COFF conversion done by LIB worked, but strongly suggests that the unresolved externals were not due to the BC++ compiler's OMF objects. Check the names inside the library. You can use tlib to generate a listing. Are you compiling C or C++ code? Fortran probably doesn't understand the name mangling conventions of C++, so all C++ functions should be Extern "C" I also suspect that Fortran, not being C, doesn't follow the C naming conventions either (that is, adding underscore before all names). Try making all of your C functions _stdcall, or if that messes up the stack, remove _stdcall and flip the compiler switch that turns off underscores (note that that messes up your using the C runtime library....example: you would need to replace strcpy() with _strcpy() in your code) Back to top Randy Stonesifer Guest Posted: Mon Jun 06, 2005 1:28 pm    Post subject: Re: OMF vs. COFF objects Quote: Are you compiling C or C++ code? Fortran probably doesn't understand the name mangling conventions of C++, so all C++ functions should be Extern "C" I also suspect that Fortran, not being C, doesn't follow the C naming conventions either (that is, adding underscore before all names). Try making all of your C functions _stdcall, or if that messes up the stack, remove _stdcall and flip the compiler switch that turns off underscores (note that that messes up your using the C runtime library....example: you would need to replace strcpy() with _strcpy() in your code) I was finally able to resolve all externals and get a usable library. The files are c not c++. I set the c++ compiler to __stdcall. The c code developers had a symbol called UPPER that when defined (it was not well documented) did a lot to help the name conventions. The unix gettimeofday function was functionally identical to a Windows Compaq Fortran portablility routine called RTC. Finally I resolved the unresolved external ftol2 by including a c++ file I found on the web. http://www.codecomments.com/archive292-2004-5-196083.html http://www.manusoft.com/Resources/ARXTips/Main.stm The error is caused by a hidden internal libary used by the compiler to convert from floating point to long called __ftol. In VC7 compilers there is a new version used called __ftol2. Since I am using VC6 libraires I had to define this to make it use the old one: #if (_MSC_VER >= 1300) && (WINVER < 0x0500) //VC7 or later, building with pre-VC7 runtime libraries extern "C" long _ftol( double ); //defined by VC6 C libs extern "C" long _ftol2( double dblSource ) { return _ftol( dblSource ); } #endif Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (Command Line Tools) All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.