Help:Gcc compiler

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Gcc includes a family of compiler front and back ends, supporting many languages including C, C++, java, and fortran for a number of processors. Only C and C++ are documented by this page, but other front ends are at least listed. Check the main documentation for additional details.

Vendor homepage
http://freshmeat.net/gcc
Software homepage
http://
Availability
unix, windows via cygwin
The main gcc suite should be installed on all unix machines. Ask if you need a front end that is not installed, or if it is not installed at all.
commands
gcc g++ g77 gcj gcjh gcov gij grepjar jar jcf-dump jv-convert jv-scan rmic rmiregistry
Other related software
emacs
gdb
View online documentation
  • man pages
  • info docs viewable in emacs
  • info --directory=/opt/gcc-342/info
Example files
Help:C examples

[edit] Basic details

The C compiler installed on these systems is the freeware gcc compiler. This compiler differs somewhat from the commercial Sun compiler. The command to run the compiler is:

gcc options... source files...

-o filename 
name the output executable filename instead of a.out
-O2 
use the maximum optimization level to reduce execution time
-g 
include extra debugging symbols to allow the use of gdb or dbx
-Wall 
turn on almost all useful warnings; this may catch bugs and portability problems in your code
-c 
compile source to object file, do not link (for independantly compiling a single module of a multiple source file project)

For example, to compile a file called prog.c, use the command

gcc -O2 prog.c

which would compile prog.c with the highest level of optimization, and save the result in the executable a.out.

[edit] Using C++

gcc supports both C and C++. If you wish to compile a C++ program, use 'g++' instead of gcc, and use the '.cpp' or '.C' extension instead of the '.c' extension. The same options as above may be used.

Read the man page for gcc and g++ for additional information.

Examine these simple C examples.

[edit] References

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