I want to call a GNU-Fortran-library from a GNU-C++ source. Is that
possible at all? If yes, what is to be done to link the program?
I get an error message that says that the module MAIN_ cannot be found.
The library withe the fortran modules is known in the project. If I try
to add more Fortran libraries to the project the Dev-Cpp aborts
completely.
Edit: 16:56
I tried to test again. Because I couldn't save the project, I opened a
new one. Strange to say but now I got error messages at compile time so
that I had to add the "extern void" statements.
Here the program:
#include <windows.h>
#include <conio.h>
extern void qqopen(int,int, char);
extern void qqpoint(int,int );
extern void qqline(int,int) ;
extern void qqclose();
int main()
{
int ix, iy;
ix=1201; iy=1001;
qqopen(ix,iy,'. \\qqtest.bmp');
ix=10;iy=10;
qqpoint(ix,iy);
ix=1190; iy=990;
qqline(ix,iy);
qqclose();
}
Now I get linkage messages meaning that the library modules couldn'd be
found. From this reason I dont get the message with the missing MAIN_
atthis time. But it will come back I think. Here the toc of the modlib:
qqbord.o
qqcircle.o
qqclose.o
qqfill.o
qqline.o
qqopen.o
qqor.o
qqplot.o
qqpoint.o
qqrandom.o
qqwhite.o
And here the actual messages:
F:\C\Dev-Cpp\bin\main.o In function `main':
[Linker error] undefined reference to
`qqopen(int, int, char)'
[Linker error] undefined reference to
`qqpoint(int, int)'
[Linker error] undefined reference to
`qqline(int, int)'
[Linker error] undefined reference to
`qqclose()'
F:\C\Dev-Cpp\bin\main.o ld returned 1 exit status
F:\C\Dev-Cpp\Makefile.wi n [Build Error] [QQPlot.exe] Error 1
What am I doing wrong? 11 2966
Cottonwood wrote: I want to call a GNU-Fortran-library from a GNU-C++ source. Is that possible at all? If yes, what is to be done to link the program?
[redacted]
What am I doing wrong?
What you're doing wrong is asking in the wrong group. I suspect you'd
be able to get a lot better help in the newsgroup gnu.g++.help
What you have is a question about a particular implementation, not about
the lanugage itself, so it's not topical in c.l.c++. However, the
people over gnu.g++.help know all about g++, and should be able to help you.
Cottonwood wrote: I want to call a GNU-Fortran-library from a GNU-C++ source. Is that possible at all? If yes, what is to be done to link the program?
I get an error message that says that the module MAIN_ cannot be found. The library withe the fortran modules is known in the project. If I try to add more Fortran libraries to the project the Dev-Cpp aborts completely.
Edit: 16:56
I tried to test again. Because I couldn't save the project, I opened a new one. Strange to say but now I got error messages at compile time so that I had to add the "extern void" statements. Here the program:
#include <windows.h> #include <conio.h> extern void qqopen(int,int, char); extern void qqpoint(int,int ); extern void qqline(int,int) ; extern void qqclose();
Try something like
extern "C" void qqopen(int*,int *,char*);
Fortran certainly does not use C++ name mangling and does not pass
parameters by value.
To successfully link you probably need a Fortran runtime library. Their
should be one as part of the GNU g77 package normally called libg2c.a
or similar.
Cottonwood wrote: I want to call a GNU-Fortran-library from a GNU-C++ source. Is that possible at all? If yes, what is to be done to link the program?
I get an error message that says that the module MAIN_ cannot be found. The library withe the fortran modules is known in the project. If I try to add more Fortran libraries to the project the Dev-Cpp aborts completely.
Edit: 16:56
I tried to test again. Because I couldn't save the project, I opened a new one. Strange to say but now I got error messages at compile time so that I had to add the "extern void" statements. Here the program:
#include <windows.h> #include <conio.h> extern void qqopen(int,int, char); extern void qqpoint(int,int ); extern void qqline(int,int) ; extern void qqclose(); int main() { int ix, iy;
ix=1201; iy=1001; qqopen(ix,iy,'. \\qqtest.bmp'); ix=10;iy=10; qqpoint(ix,iy); ix=1190; iy=990; qqline(ix,iy); qqclose(); }
Now I get linkage messages meaning that the library modules couldn'd be found. From this reason I dont get the message with the missing MAIN_ atthis time. But it will come back I think. Here the toc of the modlib:
qqbord.o qqcircle.o qqclose.o qqfill.o qqline.o qqopen.o qqor.o qqplot.o qqpoint.o qqrandom.o qqwhite.o
And here the actual messages:
F:\C\Dev-Cpp\bin\main.o In function `main': [Linker error] undefined reference to `qqopen(int, int, char)' [Linker error] undefined reference to `qqpoint(int, int)' [Linker error] undefined reference to `qqline(int, int)' [Linker error] undefined reference to `qqclose()' F:\C\Dev-Cpp\bin\main.o ld returned 1 exit status F:\C\Dev-Cpp\Makefile.wi n [Build Error] [QQPlot.exe] Error 1
What am I doing wrong?
Your 'extern' declarations should be "extern "c" void" to avoid the
name mangling that C++ will do, that Fortran does not. This is
probably part of your problem.
Thanks. I did. Here is the new source:
#include <windows.h>
#include <conio.h>
extern "C" void qqopen(int*,int *,char*);
extern "C" void qqpoint(int*,in t*);
extern "C" void qqline(int*,int *);
extern "C" void qqclose();
int main()
{
int ix, iy;
ix=1201; iy=1001;
qqopen(ix*,iy*, '.\\qqtest.bmp' *);
ix=10;iy=10;
qqpoint(ix*,iy* );
ix=1190; iy=990;
qqline(ix*,iy*) ;
qqclose();
}
But now I get messages like this:
12 F:\C\Dev-Cpp\bin\main.cp p expected primary-expression before ','
token
And I get this message (as before):
12:16 F:\C\Dev-Cpp\bin\main.cp p [Warning] character constant too long
for its type
May that cause any problems?
Thanks. Seems to be part of Markus Schroders answer. So I answered
there.
Your name sounds German. So if I'm right you may answer in German also
- as you wish.
Thanks. At the moment I just have a C++ specific question to this
problem. As soon as it is answered I will create a new thread there.
If I have problems any longer.
Thanks. At the moment I just have a C++ specific question to this
problem. As soon as it is answered I will create a new thread there.
If I have problems any longer.
@red floyd: Sorry, but I'm not able to answer to your answer directly.
I tried, but it was shown at the wrong place. So please excuse that.
Here's my answer:
Thanks. At the moment I just have a C++ specific question to this
problem. As soon as it is answered I will create a new thread there.
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