asp net read barcode from image $ gcc greet.c -o greet $ greet Hello, how are you in Software

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$ gcc greet.c -o greet $ greet Hello, how are you
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Table 2: The: gcc Utility: the C Compiler Description The gcc utility creates an executable program using a preprocessor, a compiler, an assembler, and a linker. The preprocessor executes preprocessing commands found in the source code file. Such commands perform simple text substitutions. The compiler compiles a source code file into assembly code. The assembler then compiles assembly code files into object code files. The linker then links object code files into an executable file.gcc takes as possible arguments source code, object code, and assembly code files as well as several options. gcc recognizes a file by its extension: .c C source code files .o Object code files .s Assembly code files .m Objective C .a Archive library files Invokes the cc utility work on C++ source code files. g++ takes as possible arguments source code, object code, and assembly code files as well as several options. gcc recognizes a file by its extension: .C C++ files .cpp C++ files .cc C++ source code files .o Object code files .s Assembly code files Function Output only assembly code. Assembly code versions of compiled
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Table 2: The: gcc Utility: the C Compiler Description files have extension .s. The example will generate a file called greet.s.
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Output result of preprocessor. Create object code file only. Object code versions of compiled files have the extension .o. Prepare compiled program for use with symbolic debugger. Name the executable file filename. Default is a.out. Optimize compilation. Link system library by name of filename. The filename is preceded by lib and has an extension of .a. Neither is included on the gcc command line. The -l options must always be placed after source code and object code filenames on the command line.
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With multiple-file programs, you need to keep in mind the difference between the C compiler and the linker. The purpose of a C compiler is to generate object code, whereas the purpose of a linker is to build an executable file using object code files. The C compiler will individually compile each source code file, generating a separate object code file for each one. These object code files will have the extension .o instead of .c. You compile and link multiple file programs using the same gcc command. Simply list the source code filenames as arguments on the command line. In the next example, the user compiles the bookrecs program by invoking gcc with the source code files that make it up. The -o option specifies that the executable file will be called bookrecs.
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$ gcc main.c io.c -o bookrecs
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You can use the gcc utility to perform just a link operation by only listing object code files as its arguments. An object code file has a .o extension. In the next example, the user just performs a link operation. No compiling takes place. Of course, this operation assumes that the object code files have been previously generated.
$ gcc main.o io.o
As you develop and debug your program, you will be making changes to source code files and then recompiling your program to see how it runs. If you have a very large program made up of many source code files, it would be very inefficient to recompile all of them if you only made changes to just a few of them. Those to which you made no changes do not need to be recompiled, just linked. You can direct the gcc utility to do just that, by mixing source code files and object code files as arguments on the command line. Source code files have a .c extension, and object code files have a .o extension. gcc will compile the source code files you specified on the command line, but will only use the object code files with the linker. This has the advantage of being able to compile only those files where changes have been made. If changes were made in main.c, but not in io.c, io.c would not have to be compiled. You would then specify the source code file main.c and the object code file io.o on the command line. In the next example, io.o will not be compiled, whereas main.c will be compiled:
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