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The Lounge What is on Your Mind? Technology Illustrated Concept Architecture of Unix Systems Post 302709679 by Corona688 on Wednesday 3rd of October 2012 12:27:49 PM
Old 10-03-2012
That onion picture doesn't quite work for me. A compiler is necessary to build C programs, but after that, the programs are freestanding. Shells don't exist at any higher level than application programs; they're just executables too. So sometimes the diagram describes the way things are connected; other times, it just describes how they're commonly used.
 

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QD-CONFIGG(1)															     QD-CONFIGG(1)

NAME
qd-config - determine flags for compilation and linking SYNOPSIS
qd-config [options] DESCRIPTION
To link a Fortran-90 program with the C++ qd library, it is recommended to link with the C++ compiler used to generate the library. The Fortran 90 interface (along with a C-style main function calling f_main) is found in the qdmod library. The qd-config script can be used to determine which flags to pass to compile and link your programs. OPTIONS
--src Switch between source and system location. --prefix Output configured prefix value. --exec-prefix Output configured exec_prefix value. --build-flags Compiler options used during build. --build-libs Linker options used during build. --configure-args Configure arguments used for build. --cxx C++ compiler. --cflags C++ preprocessor and compiler options. --cxxflags C++ compiler options. --libs-la C++ linker options and libtool archive location. --libs C++ linker options. --fc Fortran compiler. --fcflags Fortran compiler options. --fclibs Fortran linker options. --fmainlib C++ linker options for main program written in Fortran. --version Output version. AUTHOR
This manual page was written by Daniel Leidert <daniel.leidert@wgdd.de> for the Debian project (but may be used by others). User Commands 2008-05-11 QD-CONFIGG(1)
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