For this -fPIC option is used.įor example, the following commands create a shared library libCfile.so from source file Cfile.c: $ gcc -c -Wall -Werror -fPIC Cfile.c

This helps the shared library to get loaded as any address instead of some fixed address. While creating the shared libraries, position independent code should be produced. Create position independent code using -fPIC option The gcc command mentioned above links the code main.c with the shared library libCPPfile.so to produce the final executable ‘main’. For example: gcc -Wall main.c -o main -lCPPfile The option -l can be used to link with shared libraries. Link with shared libraries using -l option So we see that all the intermediate files as well as the final executable was produced in the output. Please note that this option produces the executable also. Through this option, output at all the stages of compilation is stored in the current directory. The option -save-temps can do all the work done in example 4,5 and 6 above. Produce all the intermediate files using -save-temps function

The command above would produce a file main.o that would contain machine level code or the compiled code. To produce only the compiled code (without any linking), use the -C option. Produce only the compiled code using the -C option In this case, the file main.s would contain the assembly output. The assembly level output can be produced using the -S option. Produce only the assembly code using -S option In our case(above), the file main.i would contain the preprocessed output. The gcc command produces the output on stdout so you can redirect the output in any file. The output of preprocessing stage can be produced using the -E option. Produce only the preprocessor output with -E option Main.c:6:10: warning: â€˜iâ€™ is used uninitialized in this function 3. If the above code is compiled, the following warning related to uninitialized variable i is produced : $ gcc -Wall main.c -o main This option enables all the warnings in GCC. Enable all warnings set through -Wall option

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