Can C and C++ object files be linked into an executable?
Hi, I have a code that is compiled in C and I need to link in C++ object files. I need to know if C++ object files created with a C++ compiler can be linked with C object files created with the C compiler. I have never attempted this. I have either written the entire project in C or C++. I have mixed C code with C++ code by placing the C code in a namespace. I have also interfaced C++ code to C code by createing a C wrapper for the C++ object but everything was compiled with an C++ compiler. Ray
Re: reading binarys
Jason, I'm not sure what you are asking here. It appears that you can do system dump of the internal state of the game. In which case the answer is yes. A programmer plans his memory space when a program is written. Every address in RAM space has a specific variable. The heap (stack) is located at a specific address, etc. If you have the source and the binaries you must also have the map file. You can write a program to parse the map file which tells you location of variables and there type. That parse result is then used to parse the system dump (binary file) and output in human readable format. Hope this answers what you asked. Ray Jason Erickson wrote: I'm working on a project where every so often one of our games comes back and we pull the ram off the game for saving, and sometimes for anaylisis. Currently the only varibles in ram that we can physically look at are the static members. The information that we would love to get to is the heap memory and be able to know what dynamically allocated structure that heap memory belongs to. I have the source code, I have the binarys, I have the ram dumps, I have the boards. Our games have the ability to recover back to the original state that they were in before a power hit, so even though the memory is dynamically allocated, our code is the only running code on the machine and since it runs the code in the same order every time, the pointers get put into the same memory locations every time. What I need to know, is there some way to read the binary with some program to figure out which order everything in memory is being allocated, so that I can write a program to read the memory dump and figure out which memory locations belong to which pointer varibles. Our code is written in C with litteraly tons of pointers. It runs on the i960 processor (yeah I know...soo old...but it works and it costs a lot of money to change once its been approved). Any ideas would be appricated to be able to read the binary to figure out the order in which varibles get loaded onto the heap.
Re: Can C and C++ object files be linked into an executable?
They told me to go to the compiler writer newsgroup. This isn't it? Ray Mike Stump wrote: On Jan 26, 2007, at 3:54 PM, Ray Hurst wrote: I have a code that is compiled in C and I need to link in C++ object files. I need to know if C++ object files created with a C++ compiler can be linked with C object files created with the C compiler. Wrong list, you want help gcc-help is closer to being the right list. Yes, you can interlink any language with any other.
Re: Can C and C++ object files be linked into an executable?
Maybe everybody has misunderstood. These are tool issues not basic C programming. Object file format has nothing to do with C programming. More specifically they are linker issues. Is the ABI format different between C and C++ object files. Ray Joe Buck wrote: On Fri, Jan 26, 2007 at 04:25:54PM -0800, Ray Hurst wrote: They told me to go to the compiler writer newsgroup. "They" told you wrong. You don't need a compiler writer to answer basic C++ programming questions.
Re: Can C and C++ object files be linked into an executable?
I think this was the answer I was looking for.
By the way, was this the correct place to post it?
Ray
Ferad Zyulkyarov wrote:
Hi,
If you want to phrase the question in terms of object file format and
linker issues, the answer is that the format is the same.
It's easy to see why: the compiler does not produce object files. It
produces files containing assembly language. The assembler produces
object files. The C and C++ compilers use the same assembler.
Before passing the ball to the assembler the compiler does name
mangling. It is different for C and C++ and the actual problem at link
time comes from here. If you have C++ sources and can compile these
sources and later link with the C object files surround your method
declarations with
extern "C" {...}
This may help. If you don't have the c++ sources, create wrappers
either to C object files or C++. For now I don't know any other
alternative.
Re: gcc 4.1.1: char *p = "str" puts "str" into rodata
Shouldn't the compiler error out here.
The statement: p = "" should have been p = '\0';
Or does the compiler treat them as equivalent.
It seems that only characters should be assigned to char's and strings
are illegal
Ray
Richard Guenther wrote:
On 1/28/07, Denis Vlasenko <[EMAIL PROTECTED]> wrote:
char p;
int main() {
p = "";
return 0;
}
Don't you think that "" should end up in rw data?
Why? It's not writable after all.
Richard.
