Gcc flags

1. What occurs when the c flag is used with the GCC command?
2. What are the purpose of the GCC flags and?
3. What is the GCC in Linux?
4. What is compile flag?
5. What are GCC switches?
6. What does GCC output?
7. What is the GCC option that runs only the preprocessor?
8. How do I pass a definition to GCC?
9. What is GCC wall?
10. What is Ldflags in Makefile?
11. What is fPIC option in GCC?

What occurs when the c flag is used with the GCC command?

-c : This command compile the program and give the object file as output, which is used to make libraries.

What are the purpose of the GCC flags and?

Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program. The compiler performs optimization based on the knowledge it has of the program.

What is the GCC in Linux?

The GNU Compiler Collection, commonly known as GCC, is a set of compilers and development tools available for Linux, Windows, various BSDs, and a wide assortment of other operating systems. It includes support primarily for C and C++ and includes Objective-C, Ada, Go, Fortran, and D.

What is compile flag?

Compile-time flags are boolean values provided through the compiler via a macro method. They allow to conditionally include or exclude code based on compile time conditions. There are several default flags provided by the compiler with information about compiler options and the target platform.

What are GCC switches?

The `gcc' command accepts switches that control the compilation process. These switches are fully described in this section: first an alphabetical listing of all switches with a brief description, and then functionally grouped sets of switches with more detailed information.

What does GCC output?

When you invoke GCC, it normally does preprocessing, compilation, assembly and linking. ... Then the output consists of object files output by the assembler. Other options are passed on to one stage of processing. Some options control the preprocessor and others the compiler itself.

What is the GCC option that runs only the preprocessor?

The -E option causes gcc to run the preprocessor, display the expanded output, and then exit without compiling the resulting source code.

How do I pass a definition to GCC?

If you want to pass an option that takes an argument, you must use -Xpreprocessor twice, once for the option and once for the argument. Perform preprocessing as a separate pass before compilation. By default, GCC performs preprocessing as an integrated part of input tokenization and parsing.

What is GCC wall?

gcc -Wall enables all compiler's warning messages. This option should always be used, in order to generate better code.

What is Ldflags in Makefile?

The make-specific variables (the ones in capital letters) follow a name convention such that: CC refers to the compiler (gcc in this case); CFLAGS contains compiler directives/options; and LDFLAGS is a list of link (or "load") directives (here, instructions to link with the C math library).

What is fPIC option in GCC?

fPIC option in GCC enables the address of shared libraries to be relative so that the executable is independent of the position of libraries. This enables one to share built library which has dependencies on other shared libraries. fPIC stands for "force Position Independent Code".