I am using the QtQuickCompiler to compile my QML files, with qmake project file.
I'd like to check what the C++ looks like but in the build-directory there is only the usual files (.cpp for the resources, the executable, and the object files .o).
Where are generated the .cpp files from the QML before being compiled as object files ?
They are in a hidden directory inside the build-directory named .qtquickcompiler/.
Related
I have a "standard " project in eclipse with source and header files included. Although all the source files within the project are compiled, despite of the fact that these source files are not included by the main.c where is the main routine.
What I want is only one compilation unit (one source file to be compiled) and the other source files to be included #include "some-folder/some-file.c"directly. Not to be compiled separately as it is now.
I tried to remove the path to those files from the Build variables but they are still compiled individually.
Please guide me how to achieve what I want.
I'm not familiar with the C tools and, like others, don't know why you would do this but can you put the other source files in a separate folder that isn't marked as a source folder? The source files in the "non source" folder shouldn't be compiled automatically.
I was trying to separate my header files (.h) from my (.cpp) implementation by storing them in two different source folders. However, Eclipse then tells the compiler to look for the .h file in the same folder as the .cpp file. This causes the compiler to stop as it can't find the specified file. Is there any way to create such folders in Eclipse and get around this issue?
In visual studio there is separate folder for header files so can we make a separate folder for header files in Eclipse CDT too?
Be warned I am new to C++.
When I compile my program I notice that there is an .obj created for every class that I have. When I looked at other programs in my program files, I realized that these programs barely had any .obj's so I guess that I am doing something wrong.
Also if I deleted the obj files from the release directory and tried to run the exe again and it still worked exactly as before, I know these files can't be pointless but...
What is their use? Should it make them for every class file? - if not how do I resolve this?
How do I put them in one directory like a folder called obj when I compile?
.obj files (.o files on Linux/Unix) are compiled source files, there will indeed be one for each .cpp file, or more formally "compilation unit". They are produced by the compilation phase of building a project.
These .obj files are then combined by linker either to an application, usually .exe file on Windows, or a library file, which on windows can be a .dll for dynamic library, or .lib for static library (which is basically a collection of .obj files in one packed into one file, see below). On Unix-like platform application usually has no extension, and dynamic library has .so extension, and static library has .a extension.
You do not see .obj files or static .lib files with programs, because they are not needed at runtime, they are used only by linker. When you run the linking phase of building a project, linker combines all the needed .obj files into .exe and .dll files (or equivalent), which are used at runtime.
Obj files are generated after compiling. The compiler generates them with many information. Then the linker generates an executable with other files, thus those OBJ files are not necessary anymore.
A very extended answer can be found in any C++ book.
There is no problem. But if you delete them you will force your compiler to compile some files that had no changes but have no OBJ file anymore. Be aware of that.
Just forget about them if you are still working in your code.
Object files are generated by compiling your code. They take your code and convert it to machine code so that the computer can understand and implement your solutions. Once the object files have been generated (a object file is generated for every .cpp file), all the relevant object files are used by the compiler to build a executable file. The executable can then be run independant of the object files, and the object files may be deleted. If another executable were to be created, object files for the relevant code would be necessary again.
Hope it helps!
I am new to Linux environment, and I just started using gcc. We have small project that has 7 to 8 cpp files. When I try to compile my files, I wonder why there is .o file for every .cpp file. There is only one main.
This is the way compilation works. Each translation unit gets turned into object code ( the .o files) then the object files get linked together and with other libraries into the final executable file. Normally the build system hides object files somewhere, but you're probably using a very simple build system or script which doesn't bother.
.o is an object file created during compilation of each cpp.
for more info Why Compile to an Object File First?
I am converting a C++ project created using Visual Studio 2005 to CMake and have stumbled upon a bit of a problem with resource files that are included in the project.
The project includes a .rc file, a bunch of .ico files and a .rc2 file.
The regular .rc file works fine in the generated project and uses the resource compiler. The .ico and .rc2 files however are causing problems when they are just being included, because in the generated project Visual Studio attempts to compile them using the C/C++ compiler.
I assume that these files are included by the .rc file, so it would probably work to just not include them in the CMakeLists.txt file, but since it is obviously possible to list them in the project (they are visible in the original project) I would like to do so, so that the user of the generated project can see that these files are being used.
What is the correct way to handle these extra VS resource files in CMake?
Try to set_source_files_properties(your.ico your.rc2 PROPERTIES LANGUAGE RC).
By default it shouldn't do anything with those files. The source file property LANGUAGE should be empty and thus the action for the file should be checked by the file type. Which shouldn't be anything since it's not something it should compile.
Check your CMakeLists.txt that is doesn't contain a set_source_files_properties command that would mess with that property.
If you want to do something with the files, here are two ways to do things:
With add_custom_target you can add them and run custom commands for them when you build the project. Granted that the files have changed.
With configure_file you can easily copy them to a build directory if needed. With the COPYONLY flag.