gcc compiler option description for Linux system programming

Gc++ (GNU Compiler Collection,gnu Compiler Set) is a set of programming language compilers developed by GNU. It is a set of &http://www.aliyun.com/zixun/aggregation/37954.html ">NBSP;" The GNU compiler set with free software issued under the GPL and LGPL licenses is a key part of the GNU program, as well as a standard compiler for free Unix-like and Mac OS X operating systems.

GCC was formerly known as the GNU C language compiler because it could only handle the C language. GCC quickly expands to be able to handle C + +. It also becomes available to deal with Fortran, Pascal, C, Java, and Ada and other languages.

The following is a description of the GCC common compilation options:

-C Option:

Compiling the source program into the target code without doing the link work, so the compiled instruction with this option does not generate a final

Executes the program, instead generating an object file with the. o suffix that is the same as the source program file name.

Example: # gcc-c TEST.C

The above command generates only TEST.O files.

-S option:

Use this option to generate only one assembly language file with a suffix named. S.

-E option:

Preprocessing only.

-V Option:

Displays the GCC version.

-X option:

Specifies the compiled language.

Indicates that a C + + compiler is used to compile the TEST.C program.

-I option:

Specifies the library and header file path.

In general, most functions under Linux place the header file in the System/usr/include directory, and the library file

is placed in the/usr/lib directory. But in some cases it's not, in these cases, using GCC compile-time

You must specify the path of the desired header file and library file.

Example: # gcc-i/home/include-o Test test.c

Specifies that the header file path is/home/include.

-L Option:

Specifies the path of the dependent library.

-static option:

Forces the program to connect to the static library.

-O Option:

Specifies the file name of the generated executable program.

Example: # Gcc-o Test test.c

Specifies that the test.c file be compiled and the executable file test is generated.

-W Option:

Suppresses the output of warning messages.

-werror option:

Converts all warnings to errors.

-wall option:

Displays all warning messages.

-O Option:

Compile-time Use option-O can tell GCC to reduce the length and execution time of the code at the same time, the effect is equivalent to-o1.

-O2 option:

Option-o2 tells GCC that in addition to completing all the-o1 level optimizations, there are some additional adjustments to be made,

such as processor instruction scheduling.

-G option:

Generate debugging information.

-PG option:

Once the compilation is complete, additional information is required for profiling.