03-04-2008
To explain this better:
You write the program into a file called "cprog.c".
Then after you execute "gcc cprog.c -o cprog", use the command "ls" to list the current files in the directory ("man ls" for more info).
You should see a file called "cprog". This file cprog was created when you did the "gcc cprog.c -o cprog", and this command means that you use the program gcc (gnu c compiler) on the c source file "cprog.c". Then the "-o" means to output the binary file to "cprog". If you hadn't used "-o", gcc would have generated a file called "a.out". ("man gcc" for more info)
Lastly, you can execute the file "cprog" by typing "./cprog" into the terminal. This means to check the directory "./" (which means the current directory that you are in) for the file "cprog". If you didn't specify that "cprog" was in "./", then the operating system would have assumed "cprog" was in "/usr/bin" or another directory (if you want to know type "$PATH" into your terminal).
Does that explain things clearly?
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LEARN ABOUT DEBIAN
builder-cc
BUILDER-CC(1) Debian GNU/Linux BUILDER-CC(1)
NAME
builder-cc - gcc wrapper to facilitate pentium-optimizations
SYNOPSIS
export DEBIAN_BUILDARCH=architecture
export DEBIAN_BUILDGCCVER=gcc-version
gcc ...
DESCRIPTION
The builder-cc wrapper is normally used by calling gcc as usual. If the environment variable DEBIAN_BUILDARCH is not set, builder-cc does
nothing, and the real gcc is invoked with the specified arguments.
When the DEBIAN_BUILDARCH environment variable is set, builder-cc invokes gcc with the specified arguments, plus -mcpu=DEBIAN_BUILDARCH
-march=DEBIAN_BUILDARCH This has the effect of telling gcc to use architecture-specific optimizations without changing the command line.
This is particularly useful for package builds.
If DEBIAN_BUILDGCCVER is not set, builder-cc calls gcc.real. If DEBIAN_BUILDGCCVER is set, builder-cc calls gcc-DEBIAN_BUILDGCCVER
instead.
ENVIRONMENT
DEBIAN_BUILDARCH
If set, the architecture to compile for. Useful values are pentium or pentiumpro.
DEBIAN_BUILDGCCVER
If set, the version of gcc to be invoked. Useful values are 3.0 or 2.95.
NOTES
The real gcc is renamed gcc.real, and a diversion is registered with dpkg-divert(1). Thus builder-cc's idea of the default gcc is dictated
by whatever package installed /usr/bin/gcc.
SEE ALSO
gcc(1)
Debian Project 2002-03-02 BUILDER-CC(1)