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The graphical user interface (GUI) domainates the current operatingenvironments for personal computing. However, there are still tons ofpowerful tools, such as gcc and gdb, using the traditional text-basedinterface. Now, let's turn on the terminal within Linux, FreeBSD, Mac OS X, or any other UNIX-like operating system to discover the power ofcommand-line tools!

1. Downloading Gcc For Mac

A guide to properly installing the latest version of Code Blocks on Mac OS with the GCC compiler and testing it with your first C program. Setting up AVR-GCC Toolchain on Linux and Mac OS X. Windows users have been enjoying various awesome tools to help with their AVR development process like the Atmel Studio, Codevision AVR, WinAVR, IAR Embedded Workbench, etc.This doesn’t mean that Mac and Linux users are. May 30, 2016  Hi, I've been using linter gcc on linux for a good time, helping me out quite a lot but when i tried to download it on mac os, it simply doesnt want to cooperate. My machine tries to use clang instead even though I've passed the path of.

GCC recognizes files with these names and compiles them as C programs even if you call the compiler the same way as for compiling C programs (usually with the name gcc). However, the use of gcc does not add the C library. Comprising of a group of tools for programming to cater to native windows apps MinGW has a GCC port like C, ADA, Fortan and C compilers. Functional for Windows, Mac OS, and Linux OS Codelite is an open source and cross-platform IDE compatible for C and C.

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Contents

• gcc
• gdb

Free download OSX GCC Installer OSX GCC Installer for Mac OS X. OSX GCC Installer is an application that either allows you to install the essential compilers from pre-built binary packages or helps you create your own installer. Hi, I was just wondering, I have been learning c on a mac and I have no way to compile my code. I need to know how to install gcc on my MacBook.

gcc

gcc is the C and C++ compiler developed by GNU project. It is widelyadopted as the default compiler of UNIX-like systems. If you are using aMac, you may also get gcc by installing Xcode (Developer) Tools in the Mac OSX installation Disc #1.

Basic Usage

Assume that we have a C source file 'garbage.c' with the content of shown below:The basic way of compiling garbage.c into an executable file called 'garbage' is:

• gcc -o garbage garbage.c

If the program is compiled without errors, you can execute the program bytyping './garbage' followed by two numbers as its arguments.

If you are interested about how the assembly code of garbage.c look like, youcan also generate the assembly code by replacing the '-o garbage' option with'-S' as: Tweakbox for mac.

• gcc -S garbage.c

The gcc will stop compiling the program after the 'garbage.s' file isgenerated. You may use any text editor to browser the content of theassembly code. To figure out what the assembly code does, you may referencethe following documents.

Downloading Gcc For Mac

. . .
• A good document on x86 ISA.

Frequently Used Options

In addition to the basic usage, gcc also provides options that help youoptimize or debug your code. For example, you may:
• Compile your code with debugging information:
  • gcc -g -o garbage garbage.c
• Compile your code with optimizations:
  • gcc -On -o garbage garbage.c
  Notice: n is usually a number through 1 to 3. The larger the number, the more optimizations are performed while compiling the code. The optimization options may differ in each platform. For example, the gcc under Mac OS also supports -Os and -Oz to allow optimization for code size.
• For other optimization/debug options, you may use
  • man gcc
  under any UNIX-like system.

gdb

gcc is a debugger by GNU project. Gdb can step through your sourcecode line-by-line or even instruction by instruction. You may also watchthe value of any variable at run-time. In additon, it also helps to identifythe place and the reason making the program crash.

Basic Usage

All program to be debugged in gdb must be compiled by gcc with the option'-g' turning on. Continue with the 'garbage' example, if we want to debug theprogram 'garbage', we can simply start gdb by:

• gdb ./garbage
Then, you will see the gdb environment similar as following:

To start running and debugging the program, we can simply type the 'run'command after the (gdb) prompt as below: If the program takes arguments such as 'garbage arg_1 arg_2', we may start running the program with these arguments as:

Breaking Program

To inspect the current state of program exeution, we need to break theexecution of debugging program in gdb. At any point, we may use ctrl-c to interrupt the running program. However, ctrl-c is hard tohelp breaking our program at a specific point. Therefore, gdb provides the 'breakpoint' function that allows us to break debugging program at the'breakpoint' set by ourselves. Gdb allows the breakpoint to be set to anysource code line, function, or even any instruction.
• Break by line: to break the program at the beginning of a certainline, we can use the command 'break source_filename:line_number'.For example, if we want to break at the beginning of main function ingarbage.c, we can do as below:
• Break by function: to break the program at the beginning of a certainfunction, we can use the command 'break source_filename:function_name()'.For example, if we want to break at the beginning of main function ingarbage.c, we can also try below:
• Break by instruction: to break the program at the beginning of a certainmachine instruction, we can use the command 'break *PC'. For example, if we want to break at the beginning of main function in garbage.c, we can also try below:

To show the current breakpoints we have, we may use the 'info breakpoint'command as:

To disable a breakpoint we have, we may use the 'disable breakpoint_number'.To re-enable disabled breakpoint, we can turn it on by 'enablebreakpoint_number'. To remove a breakpoint, we can use 'deletebreakpoint_number' or replace the 'break' with 'clear' command as wecreate these breakpoints.

To resume the exeution of the interrupted program, we can use the 'continue'or 'c' command.

Stepping through program

Once a running program is interrupted in gdb, we can step the program toinspect how the program is executed. Gdb provides several stepcommands to allow stepping program with different granularities:
• s: the debugger will step to the next line in the source code.For example, using the s command, the program will step through line 9 from line 8 after the program interrupted by breakpoint 1.
• si: the debugger will step to the next instruction in the compiled code. For example, using the si command, the program will stepthrough PC 0x00001f91 from 0x00001f8e.
• n: the debugger will step to the next source line. Each function callwill be treat as a single source code line.

Inspect variables/register value

Once a running program is interrupted in gdb, we can also inspect the valueof a variable using the 'print' command.

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If we are interested about the current value of variable a, wecan simply 'print variable_name'. For example, after line 8 is executed, wecan inspect if the atoi function correctly translate the characters tointeger as below:

Similiarly, if we are interested about the current value of a register, wecan simply 'print $register_name'. For example, after line 8 is executed, wecan inspect $eax as:

If we are interested about all the register values, we can use 'inforegisters' command to display the value in all registers.