* C++/C Linkage problems
@ 2000-06-06 10:24 Reg Anderson
2000-06-06 14:58 ` Martin v. Loewis
0 siblings, 1 reply; 4+ messages in thread
From: Reg Anderson @ 2000-06-06 10:24 UTC (permalink / raw)
To: help-gcc
I'm attempting to put a "C" wrapper on a shared object file written in C++.
Can anybody tell me the compiler and linker options I need t use to get
another "C" program to compile and link to the shared object file?
Any help would be much appreciated.
Thx.
Reg Anderson
reg.anderson@epic-systems.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: C++/C Linkage problems
2000-06-06 10:24 C++/C Linkage problems Reg Anderson
@ 2000-06-06 14:58 ` Martin v. Loewis
0 siblings, 0 replies; 4+ messages in thread
From: Martin v. Loewis @ 2000-06-06 14:58 UTC (permalink / raw)
To: reg.anderson; +Cc: help-gcc
> I'm attempting to put a "C" wrapper on a shared object file written in C++.
> Can anybody tell me the compiler and linker options I need t use to get
> another "C" program to compile and link to the shared object file?
You don't need any special options. Just link with g++.
Regards,
Martin
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: C++/C Linkage problems
2002-07-22 23:25 손석배
@ 2002-07-23 0:34 ` Claudio Bley
0 siblings, 0 replies; 4+ messages in thread
From: Claudio Bley @ 2002-07-23 0:34 UTC (permalink / raw)
To: sb.son; +Cc: gcc-help
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>>>>> "sb" == ^[$(C<U<.9h^[(B <sb.son@partner.samsung.com> writes:
sb> I made a library written in C++. Instead of offering library
sb> classes, the library offers C type library functions to the
sb> outside. (This library is compiled by g++)
sb> Now, I write a program written in C and this program use
sb> functions from the library that I mentioned above.
sb> I wanted to compile and link this C code with gcc(c complier),
sb> not g++(c++ compiler). Is it possible? If so, what option
sb> should I use? If it's not possible, what is the solution for
sb> this case?
sb> Restrication : 1. Library should be written in C++ 2. The code
sb> which use library should be written and complied by c complier
sb> 3. I want to use gcc to link this c code.
sb> * P.S. I don't know if "Restrication 3" is the strict one. But
sb> 1, 2 should be kept strictly.
Yes, it is possible. Look at this:
,----[ test.cc ]
| #include <iostream>
|
| using namespace std;
|
| extern "C" {
| bool prInt (int& x) {
| cout << x << endl;
| return cout;
| }
| }
`----
,----[ main.c ]
| #include <stdio.h>
|
| extern int prInt (int *x); /* [1] */
|
| int main (int argc, char *argv[])
| {
| printf ("%s\n", prInt (&argc) ? "good" : "failed");
|
| return 0;
| }
`----
Basically, you need to declare the functions you want to call from C
in your library as extern "C" to prevent the C++ name mangling scheme
being applied to them. You may just define wrapper functions that just
call a work function of your library internally:
bool cpp_prInt (int &i) { std::cout << i << std::endl; return std::cout; }
extern "C" int prInt (int i) { return cpp_prInt (i); }
* [1] of course, you need to map the C++ types to the appropriate C
types here.
$ g++ -c -fPIC test.cc
$ g++ -shared -o libtest.so test.o
$ gcc -c main.c
$ gcc -L. main.o -ltest
$ LD_LIBRARY_PATH=. ./a.out 1 2 3 4
5
good
HTH
Claudio
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^ permalink raw reply [flat|nested] 4+ messages in thread
* C++/C Linkage problems
@ 2002-07-22 23:25 손석배
2002-07-23 0:34 ` Claudio Bley
0 siblings, 1 reply; 4+ messages in thread
From: 손석배 @ 2002-07-22 23:25 UTC (permalink / raw)
To: gcc-help
I made a library written in C++.
Instead of offering library classes, the library offers C type library functions to the outside.
(This library is compiled by g++)
Now, I write a program written in C and this program use functions from the library that I mentioned above.
I wanted to compile and link this C code with gcc(c complier), not g++(c++ compiler).
Is it possible? If so, what option should I use?
If it's not possible, what is the solution for this case?
Restrication :
1. Library should be written in C++
2. The code which use library should be written and complied by c complier
3. I want to use gcc to link this c code.
* P.S. I don't know if "Restrication 3" is the strict one. But 1, 2 should be kept strictly.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2000-06-06 10:24 C++/C Linkage problems Reg Anderson
2000-06-06 14:58 ` Martin v. Loewis
2002-07-22 23:25 손석배
2002-07-23 0:34 ` Claudio Bley
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