From: ert AT cit DOT org DOT by (Andrew Lipnitsky) Subject: Re: Usage of dll created in cygwin in VC++ 22 Jan 1999 18:36:28 -0800 Message-ID: <36A8A8DA.F56928A5.cygnus.gnu-win32@cit.org.by> References: <000f01bc05f0$2fee7d60$11247aa3 AT sdf5_l1117 DOT tatainfotech DOT co DOT in> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------2D9B1EB428533349D97B8589" To: "S. Krishnaprasad" , gnu-win32 AT cygnus DOT com This is a multi-part message in MIME format. --------------2D9B1EB428533349D97B8589 Content-Type: multipart/alternative; boundary="------------5F9685F673F044173EEED2FC" --------------5F9685F673F044173EEED2FC Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: 7bit "S. Krishnaprasad" wrote: > I have useddllwrap --export-all mdll.dll mylib.a -L. -lgmp I get the > DLL file.But when I try to use it in a Visual C++ application it gives > me a undefined reference to the functionnames defined in this DLL.I > created a export .DEF file which is as follows LIBRARY > EXPORTS function1 function2 etc..Then I created a > import file .lib using dllwrap --dllname --output-lib > This created a .lib file > > This when linked into a Visual C++ application it compiles and links > properly but whenI try to run this application it just terminates at > the function call. Can anybody help me. Yes. In order to link dll you have to get library file. But you have to use LIB.exe program from VisualStudio like that d:\DevStudio\VC\bin\LIB.EXE /DEF:foo.def After that you will get foo.lib file. >This when linked into a Visual C++ application it compiles and links properly but when >I try to run this application it just terminates at the function call. Due to program (as well dll) compiled with cygwin using cygwin1.dll you can not link it with Visual C++ . In order to get rid cygwin1.dll you must compile your files with -mno-cygwin option, for example: gcc -mno-cygwin -c foo.c -o foo.o gcc -mno-cygwin -c dllinit.c -o dllinit.o And you must create dll with --target option, for example dllwrap --target i386-mingw32 -mno-cygwin --dllname foo.dll foo.o dllinit.o After that you will get foo.dll file and so you can going to VC. Note: At first, you must have something like dllinit.c file (see attachment). At second, the algorithm described above is suitable only for C, not for C++ language. --------------5F9685F673F044173EEED2FC Content-Type: text/html; charset=koi8-r Content-Transfer-Encoding: 7bit
"S. Krishnaprasad" wrote:
I have useddllwrap --export-all mdll.dll mylib.a -L. -lgmp I get the DLL file.But when I try to use it in a Visual C++ application it gives me a undefined reference to the functionnames defined in this DLL.I created a export .DEF file which is as follows LIBRARY <dllname>EXPORTS function1 function2 etc..Then I created a import file .lib using dllwrap --dllname <name.dll> --output-lib <libname.lib> This created a .lib file
This when linked into a Visual C++ application it compiles and links properly but whenI try to run this application it just terminates at the function call. Can anybody help me.
Yes. In order to link dll you have to get library file. But you have to use
LIB.exe program from VisualStudio like that
d:\DevStudio\VC\bin\LIB.EXE /DEF:foo.def
After that you will get foo.lib file.
>This when linked into a Visual C++ application it compiles and links properly but when
>I try to run this application it just terminates at the function call.
Due to program (as well dll) compiled with cygwin using cygwin1.dll
you can not link it with Visual C++ . In order to get rid cygwin1.dll
you must compile your files with -mno-cygwin option, for example:
gcc -mno-cygwin -c foo.c -o foo.o
gcc -mno-cygwin -c dllinit.c -o dllinit.o
And you must create dll with --target option, for example
dllwrap --target i386-mingw32 -mno-cygwin --dllname foo.dll foo.o dllinit.o
After that you will get foo.dll file and so you can going to VC.
Note:
At first, you must have something like dllinit.c file (see attachment).
At second, the algorithm described above is suitable only for C, not for C++
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