GNU C++ compiler.
g++ [options] file-list
g++ does preprocessing, compilation, assembly, and linking. This process can be stopped at an intermediate stage.
The file-list contains the list of source files and object files that are used as input by g++.
-std=c++14 |
use C++14 standard This option causes g++ to use the C++14 standard. By default, it will use the C++98 standard. |
-g |
include debugger info This option causes g++ to produce debugging information for use by the debugger. This allows you to use gdb to debug your program, but greatly increases the size of the executable file. |
-o output-file |
specify output file name This option tells g++ to place its output in the file output-file. If -o is not specified, the default is to put the executable output in a file named in a.out and the object file for source.cpp or source.cc in source.o. |
-Wall |
show all warnings This option turns on all optional warnings which are desirable for normal code. |
-Werror |
treat warnings as errors This option prevents code with warnings from successfully compiling. |
-ansi |
conform to ISO standard C++ This option turns off g++ features that are incompatible with the ISO C++ standard. |
-pedantic |
conform to strict ISO C++ This option issues all warnings demanded by strict ISO C++ and rejects programs that use forbidden extensions. |
-c |
compile only This option causes g++ to not run the link phase of the build process. No executable file is created and the output consists solely of object files. |
The first command line compiles, assembles, and links a C++ source file in the working directory named prog1.cpp, producing an executable file named a.out. The executable file is then run as a program, producing the output "Hello world".
z123456@turing:~$ g++ -Wall -Werror -std=c++11 prog1.cpp z123456@turing:~$ ./a.out Hello world z123456@turing:~$
The next command line compiles and assembles a C++ source file named prog2.cpp, but does not link it. The output from this command is an object file named prog2.o.
z123456@turing:~$ g++ -Wall -Werror -std=c++11 -c prog2.cpp
The final example compiles and assembles three C++ source files named prog3.cpp, Name.cpp, and Employee.cpp. The object files produced are then linked together along with the object file mylib.o to produce a single executable file named prog3.
z123456@turing:~$ g++ -Wall -Werror -std=c++11 -o prog3 prog3.cpp Name.cpp Employee.cpp mylib.o