Linux Compilers and Assemblers
SEP 19, 2003 By Christopher Paul, Rafeeq Rehman.
Article is provided courtesy of Prentice Hall.
3.4 Linking a program
As mentioned earlier, building an executable binary file from a source code file is a multi-stage process.
gcc compiler usually carries all these steps for you by default. However you can stop
gcc at any of these stages for various reasons. You have already seen how to create assembler code from a C source code file.
In most software projects, output binaries are built from many source code files. For this purpose you have to compile these
source code files to object files one by one before you can generate the output binary file. After creating these object files,
you can link these files using
gcc to the final executable.
gcc compiler gets help from different programs during the four steps listed earlier in this chapter. During the linking part,
ld program is invoked with appropriate arguments to link one or many object files together with libraries to generate an executable.
Command line switches used with
ld can be found using manual pages.
The linker is a part of GNU binary utilities package also known as binutils. You can download and install the latest version
of GNU linker if you need to do so.
Next Section 5. Assembling a Program
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