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What are object files in c?

Updated: 8/11/2023
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Object files are intermediate files generated when an application is constructed from source code. In a classic compile-assemble-link toolchain, the compiler translates (C language) source code into assembly language output. The assembler translates this intermediate assembly source into a binary form known as object code. Files containing object code often have a .o or .obj file name extension and are generally called object files. The linker takes the object files and combines them into the complete executable.

While many modern tools hide the individual steps, or even integrate compilation and assembly into one, most (all?) compilers generate object files.

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In C program: never.

From C source program: during the compilation.

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Q: What are object files in c?
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What is the output of the compiler in C?

The output of both C and C++ compilers is one or more object files. The object files must then be processed by a linker in order to produce a machine code executable. Note that object files have nothing whatsoever to do with object-oriented programming. Object files contain relocatable machine code plus metadata relating to the code in order to assist with linking. The linker typically processes and combines relevant machine-code portions of the object files to produce the final executable.


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