As we are talking about Dev-cpp and MinGW, I have quite a strange problem.

I have installed MinGW, set my paths, compiled Allegro and some libraries to d:\cpp\mingw.

Then I installed Dev-cpp to d:\cpp\devcpp and configured it to recognize mingw directory and so on.

When I try to compile a simple hello world program

#include <iostream>

using namespace std;

int main (int argc, char *argv[])
{
  cout << "Hello World!" << endl;
  cout << "Press ENTER to continue..." << endl; 
  cin.get();
  return 0;
}

I get this error:

Compiler: Default compiler
Building Makefile: "D:\cpp\devcpp\Makefile.win"
Executing  make...
mingw32-make -f "D:\cpp\devcpp\Makefile.win" all
g++.exe -c hello_world.cpp -o hello_world.o -I"D:/cpp/mingw/include"  -I"D:/cpp/mingw/include/c++/3.4.2"  -I"D:/cpp/mingw/include/c++/3.4.2/mingw32"   
g++.exe: no input files

mingw32-make: *** [hello_world.o] Error 1
Execution terminated

By manually calling g++ and ld from command line, I can compile it without any problems.

My hello_world.cpp is stored in d:\cpp\devcpp.
I guess this may be caused by messed paths or something, I wasn't able to find any help about this on the Internet.

I think that, as usually, I make a silly mistake somewhere. Any suggestions?

Yes, I did. It complained - no rule to make target...

Great. Thank for suggestion - I didn't think about this.

As a single file I can compile it.
As a project not.
=problem with makefile
=bug?
=bad settings?

note: in a single file, no *.o files are created... ?

My makefile:

I don't like no directory in RES =

edit:
I directly run dev-cpp.exe from its directory.

Yes, I won't be able to compile it manually if it hadn't existed

This is strange:
By using devcpp I get:

Compiler: Default compiler
Building Makefile: "D:\cpp\devcpp\Makefile.win"
Executing  make...
mingw32-make -f "D:\cpp\devcpp\Makefile.win" all
g++.exe hello_world.o hello_world_private.res -o "hello_world.exe" -L"D:/cpp/mingw/lib"  
g++.exe: no input files

mingw32-make: *** [hello_world.exe] Error 1
Execution terminated

With Windows command line (cmd):

mingw32-make
g++.exe hello_world.o hello_world_private.res -o "hello_world.exe" -L"D:/cpp/mingw/lib"  
g++.exe: no input files

mingw32-make: *** [hello_world.exe] Error 1
Execution terminated

Using MSYS:

$ mingw32-make
g++.exe hello_world.o hello_world_private.res -o "hello_world.exe" -L"D:/cpp/mingw/lib"

note: with MSYS, something weird happens so I have "no access rights" to my file, but at least it is compiled.

I think that mingw needs a path to the project / it needs to be set in the makefile. ?

I don't understand. I am recompiling the object file?...

OK, but this still does not solve the problem with devcpp.

edit:
The solution seems to be to have devcpp in different directory and then copy all libs created by "custom" mingw to devcpp.