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Command-line compilation is a process in which source code files are compiled and linked to produce an executable file using a compiler through the command line interface (CLI) of an operating system. This is a common practice in C programming where compilers like GCC (GNU Compiler Collection) or Clang are used.

Here are some examples and explanations related to command-line compilation in C:

1. Basic Compilation:
   To compile a single C file into an executable:

   gcc -o output_file source_file.c

Example:

   gcc -o hello hello.c

2. Specifying Compiler Flags:
   Compiler flags can be used to control the behavior of the compiler:

   gcc -o output_file -Wall -Wextra source_file.c

Example:

   gcc -o hello -Wall -Wextra hello.c

3. Including Libraries:
   Include libraries during compilation with the -l flag for linking and -I flag for include directories:

   gcc -o output_file source_file.c -lmylib -I/path/to/includes

Example:

   gcc -o hello hello.c -lm -I/usr/local/include

4. Debugging:
   Include debugging information with the -g flag:

   gcc -o output_file -g source_file.c

Example:

   gcc -o hello -g hello.c

5. Optimization:
   Apply optimization with the -O flag:

   gcc -o output_file -O2 source_file.c

Example:

   gcc -o hello -O2 hello.c

6. Multiple Source Files:
   Compile multiple source files into a single executable:

   gcc -o output_file source_file1.c source_file2.c

Example:

   gcc -o program file1.c file2.c

7. Creating Object Files:
   Create object files without linking:

   gcc -c source_file.c

This creates an object file source_file.o which can be linked later.

8. Linking Object Files:
   Linking object files into an executable:

   gcc -o output_file file1.o file2.o

These examples illustrate various ways to use the command-line to compile C programs, control the compilation process, and manage the inclusion of additional libraries and source files. Through command-line compilation, programmers have a high degree of control over how their code is built and optimized.

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