How Compilation Works Internally In C And C++?

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In this video we'll learn about How Compilation Works Internally In C And C++, it is very common question in C and C++ programming interviews.
There are several steps your program goes through when it is being compiled and i have tried to cover almost all the steps in details.
#cpp #interviewquestions #programming #tutorial #coaching #beginners #computerscience #softwareengineering

[@CppNuts]

Hi everyone, Don't forget to hit LIKE and SUBSCRIBE button for more videos like this!! And this will help me a-lot.

[@niketzope3884]

Sir, can I have your mail-id, Actually, I'm an embedded Engineer Fresher in need of guidance gone through your c++ videos while viewing this video you mentioned ready queue I want to get in-depth knowledge c++ programming with Kernel. Please reply

[@CppNuts]

Happy to see you so interested in c++, but i am not from Embedded background so i don't have much info about your question. But try hard in google you will get the answer for your questions i am sure.

[@greymind0072]

Exceptional , simply so lucid and effective way of sharing knowledge. This page deserved million views and like for the quality content it have. Thank you so much for all the help and tutorials

[@CppNuts]

Thanks man..

[@rickzhi5498]

No problem

[@subbumotepalli]

Y i was missed cppnuts these many days.luckly i found today.Thank you sir.Asome topics and explanation.

[@CppNuts]

Thanks man, share with friends so that they can be benefited too.

[@senthilandavanpalani7294]

Basic and Useful concise video.Thank you for this post. Compiler does not mean it only gives *.o files.But there are things happening underhood such as preprocessor, then proprocessor files are used by compiler and process it and gives assembler code.Then assembler code code was used by Assembler and after it processed it gives object files.Then object files and static libraries are used by linker and process then gives executable file.Then executable file and the dll,.so files are used by Loader to load into the OS. You guys are really helping a lot of C++ people including you.Expecting many more concepts.

[@CppNuts]

I appreciation it.

[@jitendrabaug6928]

It is so nice of you to create these videos. Thank you Very Much. One request .. Could you please explain the member functions(static/non-static) and where it is stored in memory model(code/Data/Stack/Heap) and how the call is performed ?

[@sireeshajangam1561]

Wonderful explanation sir👍👍👍

[@CppNuts]

Thanks man.

[@faroquealjakaria3661]

Thanks a lot! This really cleared some of my doubts. Good job.

[@CppNuts]

Faroque AI Jakaria Hi.. Welcome Dude.. Keep Learning!!

[@sauravgupta6166]

g++ fileName.cpp --save-temps also worked on Windows! Thank you so much, I glad to know about your channel by one of my true friend.

[@CppNuts]

Glad to help!

[@programmingwithht]

In windows We use g++ -o main.exe main.cpp --save-temps To get assembler file, preprocessor file and object file

[@nemesisanims7401]

Please add in depth videos, i rellly love this, and you should start teaching OS with c++, you will definetly rock

[@CppNuts]

Sure.. man thanks..

[@bostonlights2749]

wow man.... this is so cool looking under the hood to see all the assembly level code written.

[@CppNuts]

Thanks dude..

[@ashrafashraf4404]

Great teaching boss I Love The Video

[@CppNuts]

Many many thanks

[@raisshaikh2105]

It would be good if you can upload video about how dynamic and static libraries are loaded during program execution?

[@CppNuts]

+Rais Shaikh Hi.. Nice question, wait for next week. :)

[@tapanjeetroy8266]

Thanks for this awesome explanation

[@CppNuts]

Welcome

[@abhishektandon2312]

Does Linker create .exe file in case of ubuntu , because .exe are only compatible with windows OS

[@mayaicdi]

Love your videos! Keep up the good work!

[@CppNuts]

Thanks

[@R_BNK]

Nice work bro ... Your videos are very helpful ...Keep it up

[@CppNuts]

+Rohit Benake hi.. i would :D thanks dude..

[@deepaksingh-mk2nu]

Hi you doing great job Regularly i am watching your video i have an doubt Q1. Why derived class pointer can not point to base class pointer? Q2. If we are not creating the copy constructor compiler will provide the copy constructor But if we write our own the copy constructor then how the compiler know no need to create the copy constructor? Thanks

[@CppNuts]

Ans 1: i will create a video for this, so stay tuned for your answer. Ans 2: copy constructor syntax is fixed so when you are compiling code then compiler checks for copy constructor syntax in your class and if that is available then compiler doesn't provide its own.

[@deepaksingh-mk2nu]

many many thanks to you :)

[@luckbychance3179]

Why derived class pointer can not point to base class pointer?: Because a base class pointer do not have any idea about the content of Base class so when pointing a derived class pointer to a base class will cause an error. You can do the upcasting to perform such operations.

[@shivakaramadi9444]

your videos are amazingly informative and very helpful. Do you know how do I capture pre-processor output?

[@CppNuts]

In linux there is an option u can provide while compiling which is save-temps which should give u that, i dont know in windows. And google about save-temps u will get it.

[@arunselvasuresh6048]

Please explain about static and dynamic libs

[@R_BNK]

Very Good Explanation ...👍

[@CppNuts]

+Rohit Benake hi.. thank you so much.. :D

[@mockingbird3809]

great explanation!

[@CppNuts]

Glad it was helpful!

[@techytechwithgunjan9175]

perfect explanation

[@CppNuts]

Thanks man...

[@dreamskycreations1902]

Nicely explained bro👍

[@CppNuts]

Thanks man..

[@testingDhippiuh]

Thanks for sharing

[@CppNuts]

My pleasure

[@m.vineeth9724]

Awesome explanation 🔥

[@CppNuts]

Glad you liked it

[@kunalprasad1678]

Why adding function to structure or class doesn't increase its size but variable increases its size...? Can you please explain.

[@spicytuna08]

u r like a classical pianist virtuoso except you use keyboard. pretty impressive.

[@CppNuts]

Thanks for such a nice comment!! :D

[@aftabalam5521]

When we say new state of operating system where is our code(hard disk or ram? Like u said that loader loads the executable to ready state of OS?

[@CppNuts]

When you double click any application, then the application will get converted into pages and will be stored in RAM. This is new state. Page creation is very big topic search it. (if you already don't know)

[@TheStrelok7]

Parsing the Template in preprocess stage or in compile stage?

[@CppNuts]

+Iron Core hi.. it happens at compile time.

[@TheStrelok7]

can you prove that cuz i'm little some confused! one last thing, someone said: if C++ templates are implemented by preprocessing, there will be issues with dynamic linking(using .dll). how could this happen?

[@CppNuts]

+Iron Core Read second answer. stackoverflow.com/questions/6264249/how-does-the-compilation-linking-process-work

[@deepaksingh-mk2nu]

Hi man .... What i am saying it might be more than expectation ..... Can you make some video for real time work and how industry is working on the c++ and how it works .....too many underprivileged people can make benefit from it No one is there like you that's why i am requesting.... Again Many many thanks to you for your great job ...

[@sonulohani]

good one bro... u deserve more subs

[@CppNuts]

+Sonu Lohani hi.. thanks for your appreciation, and i will have one day for sure.. ;)

[@azadalishah2966]

Can u pls explain how .dll and .so is linked/loaded while running executable? Thanks in advance:)

[@kunalprasad6898]

I have a doubt.If Dll is linked with .exe then why our code throws error while building program if we dont mentioned path of dll.According to your concept it should throw error when i will try to run not build? Please let me know if I am wrong.

[@aby_yadav]

Good question. Dynamic libraries (dll or .so) are also looked by linker for resolving symbols. You can run ldd to see from where it is linking.

[@sivaramakrishnachitithoti1428]

Thanks

[@CppNuts]

Welcome..

[@vvpChannel3112]

i dont understand .in the diagram u said .asm file generates first and assembler converts .asm to .obj file...and demo u showed that obj file generates before .asm file

[@CppNuts]

.asm come first then .obj.

[@alliswell6587]

will you please explain the compilation steps in windows

[@CppNuts]

It is similar, there is no difference in compilation when it comes to OS.

[@nemesisanims7401]

just a bit of suggestion, please combine your knowledge with Operating Systems, it will really boost up your channel

[@CppNuts]

Sure.. i will try..

[@sethupathynarayanaswamy8192]

Good Job :-)

[@CppNuts]

Thanks man!!

[@jotirlingswami9357]

The comment is replaced with empty new line after preprocessor in *.ii file.

[@TechSafarWithSunil]

If my program compile successfully then how it fails at linking time?

[@CppNuts]

sunil singh Hi.. It can not compile successfully if not linked properly, for example linking means it can see whether the definition of every function i have used is available if not than linking error. [Preprocessor -> Compiler -> Linker] ==>> all these phases combined together is called Compiler. Don't get confuse with 2nd step being named as compiler i don't know why they kept it so confusing (everything all together is called compiler and 2nd step is also called compiler). If you are still confuse please wait for my another video where i will take an example and will explain all the intermediate steps with that.

[@TechSafarWithSunil]

Thank you sir

[@jotirlingswami9357]

#include void foo() { #define MY_NAME "Alex" } int main() { std::cout

[@CppNuts]

#define will be available after defining it, and in second case you are trying to use before defining.

[@jotirlingswami9357]

@@CppNuts So at the time of compilation it read the value of MY_NAME and replace at where ever it find MY_NAME. It has only file and global scope right?

[@CppNuts]

@@jotirlingswami9357 #define can be inside functions also, and it has nothing to do with compilation, as it will be processed during preprocessing time. But your 2nd program is not working because MY_NAME is not replaced with preprocessor because when preprocessor would have reached to line: std::cout

[@jotirlingswami9357]

@@CppNuts Very good explanation Thank you sir

[@aseemsameer7281]

Cool

[@sonulohani]

are you a student?

[@CppNuts]

+Sonu Lohani hi.. No dude i work, and fallen in love to make videos and want to make a huge channel for C & C++.

[@sonulohani]

CppNuts if you dont mind can i ask where do you work

[@CppNuts]

+Sonu Lohani hi.. Dude thanks for your interest, i work in Bangalore. Company i can't tell because i want to keep it secret until i announce this channel in my friend circle. :D

[@sonulohani]

Thanks for sharing the details... Its ok to keep it as secret. I also work in Bangalore as C++ dev.

[@CppNuts]

+Sonu Lohani hi.. great.. can you share the company if it's ok with you. ;)

[@oldold6636]

ok?ok?ok?

[@CppNuts]

yess one of my bad habits.. :)

[@ArunDhyani]

CppNuts usually you get this habit by talking to south Indians 😂 . But hey if you could tell us more about shared objects and how do they work . It would be really helpful.

[@CppNuts]

Yes i am in Bangalore :), and i didn't get your question about shared objects plz explain more..?

[@ArunDhyani]

Hi , I am also a c++ developer . First you get .o and then linker generates .lo . I am clear to these steps . But how does .so are generated and I think I read somewhere that they are dynamic linked (how does that work? ). If you could make a separate video for explaining shared objects it would be really helpful.

[@CppNuts]

Ok, that requires another video will try some day..

[@mallika1427]

Thanks

[@CppNuts]

Thanks