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Is it possible to compile program on one platform and link with other ? What does object file contain ? Can we delink an executable to produce object file ?
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An object file contains the same instructions in machine-readable, binary form. Assembly files can be translated to object files by the assembler (as). An LLVM bitcode file (. bc) contains LLVM instructions in binary form.
C is a portable programming language If you write a C code in your machine, it will run on any machine which supports C, without modifying a single line of code. Because it is not tied to any hardware or system. We can say, it is a hardware independent language or platform independent language.
An object file is a computer file containing object code, that is, machine code output of an assembler or compiler. The object code is usually relocatable, and not usually directly executable. There are various formats for object files, and the same machine code can be packaged in different object file formats.
The main difference between object file and executable file is that an object file is a file generated after compiling the source code while an executable file is a file generated after linking a set of object files together using a linker. C is a general-purpose, high-level programming language.
No. In general object file formats might be the same, e.g. ELF, but the contents of the object files will vary from system to system.
An object file contains stuff like:
Object code that implements the desired functionality A symbol table that can be used to resolve references Relocation information to allow the linker to locate the object code in memory Debugging information The object code is usually not only processor specific, but also OS specific if, for example, it contains system calls.
Is it possible to compile program on one platform and link with other ? Absolutely. If you use a cross-compiler. This compiler specifically targets a platform and generates object files (and programs) that are compatible with the target platform. So you can use an X86 Linux system, for example, to make programs for a powerpc or ARM based system using the appropriate cross compiler. I do it here.
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