I have Mac OS X Mountain Lion. I need to compile a few apps and Perl modules. I already installed Xcode from app store but I’m unable to find gcc compiler or make command. How do I install gcc on Mac OS X 10.8.x?
2020-3-15 How do I set the static library path in OS X Lion? Ask Question Asked 6 years, 7 months ago. Active 2 years, 9 months ago. Viewed 18k times 5. Instead of typing. DYLD is for dynamic libraries when the app runs ie.dylib (or.so) and not static linking which is at link time – user151019 Jun 20 '15 at 14:42. Add a comment 0. Gcc -x c hello.pig -x none filename 关掉上一个选项,也就是让gcc根据文件名后缀,自动识别文件类型 。 例子用法: gcc -x c hello.pig -x none hello2.c -c 只激活预处理,编译,和汇编,也就是他只把程序做成obj文件 例子用法: gcc -c hello.c 他将生成.
Xcode includes command line development tools such as gcc and friends.
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Step #1: Install Xcode on a Apple Mac OS X
First, make sure Xcode is installed. If it is not installed on OS X, visit app store and install Xcode.
Step #2: Install gcc/LLVM compiler on OS X
Once installed, open Xcode and visit:
Xcode menu > Preferences > Downloads > choose 'Command line tools' > Click 'Install' button:
Xcode will download package and install copies of the core command line tools and system headers into system folders, including the LLVM compiler, linker, and build tools.
Step #3: Verification
Open a terminal app and type the following commands: $ gcc --version $ whereis gcc $ whereis make Sample outputs:
Testing sample “Hello world” C program
Mac Os X Gcc Link Static Library In Houston Tx
Create a text file called a.c as follows using a text editor such as vi or cat command:
To compile, enter: $ make a Run it as follows: $ ./a Sample outputs:
See also
And, there you have it, the gcc version 4.2.1 installed and working correctly on the latest version of Mac OS X 10.8.4. In Apple’s version of GCC, both cc and gcc are actually symbolic links to the llvm-gcc compiler. Similarly, c++ and g++ are links to llvm-g++. For more information and examples see the following man pages:
$ man gcc $ man make
This entry is 5 of 13 in the Linux GNU/GCC Compilers Tutorial series. Keep reading the rest of the series:
Mac OS X: Install GCC Compiler with Xcode
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For those who are not familiar with static and dynamic library, the differences between static and dynamic library is the way it was compile and run. To use a static library, the application and the static library must be present during compilation. The compiler will extract the code from the static library and incorporated into the application program. You'll have only one application binary file.
When using dynamic library, the compiler do not incorporate the code from the dynamic library into the application program. The application program will load the library during runtime. In this case, you'll need to deliver two binary files to the user; the main application binary and the dynamic library file. The advantages of using dynamic library are smaller application size since the library code is not incorporated in the application program and it may reduce memory usage when since the library is loaded only when the function is needed.
There are two usage of dynamic library in Mac OS X. The first usage is to load the library when the application is loaded. For preparation of such usage, you need to link the dynamic library while compiling the application.
Gcc Dynamic Library
The second usage is to use the library as runtime-loaded library, in this case, the library is loaded when the application call for it using command such as dlopen in the application program. The implementation of such usage is beyond the scope of this article.
Example
The following program is a complete program that uses some math functions:
To create a dynamic library so that we could share and reuse all the custom math functions with other programs; we will place the function declaration into libmymath.h. Then, we place the functions for circle in libmymath1.c and the power functions in libmymath2.c. Note: You can have many C program file with just one header file such as lib.h, lib1.c, lib2.c ... and so on.
The header file for libmymath.h is as follows: The program file for libmymath1.c is as follows: The program file for libmymath2.c is as follows:
Create Dynamic Library
In Mac OS X, you can create dynamic library using the command gcc or clang or libtool.
Library Naming Convention
The naming convention is a little different in Mac OS X. The library is prefix with lib and end with extension .dylib. Before the extension you can put in major release and minor release. The major release can be an alphabet or a number.
An example would be libmymath.A.dylib or libmymath.1.dylib or libmymath.I.dylib.
Macos Link Static Library
You can also specify the minor revision which should be after the major version symbol. Alternatively, you can specify it during compilation.
Compiling a Dynamic Library
Use the following command to create a dynamic library instead of executable:
If you have only one C implementation program for the library use the command:
If you have more than one C implementation program, use the following:
If you do not have the C implementation program file with you, you can also use libtool to create the dynamic library from object file:
Note: The standard location for dynamic library is at /usr/lib. The standard location for header file is at /usr/include.
Create the Application Program
Create the following application program named as app1.c:
The command to compile the application program is as follows:
Options:
If your dynamic library is already located some where in the system. Use the following command and indicate the full path of the library location:
Note:
Please note that in Max OS X the linker ld is use with dyld, gcc is the symbolic link to llvm-gcc.
Library Tools To check the library dependencies of a particular application program use the command otool.
The system will return libmymath.1.dylib (compatibility version 1.0.0, current version 1.0.0)
Special Note (Important)
Please note that using dynamic libraries is a very complex operation. The above tutorial is to give you a simple idea about using dynamic library in the simplest form. If you have more complex requirement such as exposing only some of the function in the program and hide internal function, you might need to use EXPORT in the C program file and use -fvisibility=hidden during compilation. There are many issues to consider when there are multiple dependencies and multiple versions involved. You might also need to use dlopen command to open the dynamic library. For more information pleaser refer to Mac Developer Guide on Dynamic Library Programming.