Using G to compile multiple cpp and h files

Question

I ve just inherited some C   code that was written poorly with one cpp file which contained the main and a bunch of other functions  There are also  h files that contain classes and their function definitions  Until now the program was compiled using the command g   main cpp  Now that I ve separated the classes to  h and  cpp files do I need to use a makefile or can I still use the g   main cpp command

User · Answer

Now that I ve separated the classes to  h and  cpp files do I need to use a makefile or can I still use the  quot g   main cpp quot  command   Compiling several files at once is a poor choice if you are going to put that into the Makefile  Normally in a Makefile  for GNU Make   it should suffice to write that     quot all quot  is the name of the default target  running  quot make quot  without params would use it all  executable1    for C    replace CC  c compiler  with CXX  c   compiler  which is used as default linker CC   CXX     tell which files should be used   cpp - gt   o make would do automatically executable1  file1 o file2 o  That way make would be properly recompiling only what needs to be recompiled  One can also add few tweaks to generate the header file dependencies - so that make would also properly rebuild what s need to be rebuilt due to the header file changes

User · Answer

list all the other cpp files after main cpp   ie   g   main cpp other cpp etc cpp   and so on   Or you can compile them all individually    You then link all the resulting   o  files together

User · Answer

As rebenvp said I used   g     cpp -o output   And then do this for output     output   But a better solution is to use make file  Read here to know more about make files   Also make sure that you have added the required  h files in the  cpp files

User · Answer

You can still use g   directly if you want   g   f1 cpp f2 cpp main cpp   where f1 cpp and f2 cpp are the files with the functions in them  For details of how to use make to do the build  see the excellent GNU make documentation

User · Answer

I know this question has been asked years ago but still wanted to share how I usually compile multiple c   files    Let s say you have 5 cpp files  all you have to do is use the   instead of typing each cpp files name E g  g   -c   cpp -o myprogram   This will generate  myprogram  run the program   myprogram   that s all    The reason I m using   is that what if you have 30 cpp files would you type all of them  or just use the   sign and save time     p s Use this method only if you don t care about makefile

User · Answer

If you want to use  include  lt myheader hpp gt  inside your cpp files you can use   g     cpp -I  -o out

User · Answer

h files will nothing to do with compiling     you only care about cpp files    so type g   filename1 cpp filename2 cpp main cpp -o myprogram  means you are compiling each cpp files and then linked them together into myprgram    then run your program   myprogram

User · Answer

To compile separately without linking you need to add -c option   g   -c myclass cpp g   -c main cpp g   myclass o main o   a out

User · Answer

You can use several g   commands and then link  but the easiest is to use a traditional Makefile or some other build system  like Scons  which are often easier to set up than Makefiles

User · Answer

In ProjectDirectory   g   coordin main cpp coordin func cpp coordin h    In ProjectDirectory     a out      Worked     Using Linux Mint with Geany IDE  When I saved each file to the same directory  one file was not saved correctly within the directory  the coordin h file  So  rechecked and it was saved there as coordin h  and not incorrectly as -  coordin h gch   The little stuff  Arg

User · Answer

I used to use a custom Makefile that compiled all the files in current directory  but I had to copy it in every directory I needed it  everytime    So I created my own tool - Universal Compiler which made the process much easier when compile many files

[c++] Using G++ to compile multiple .cpp and .h files

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