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Similarly, a variable CPPFLAGS exists with switches to be passed to the C or C++ preprocessor. Similarly, FFLAGS enables the addition of switches for a Fortran compiler. These variables are most commonly used to specify optimization or debugging switches to a compiler, as for example -g , -O2 or ( GCC -specific) -march=athlon .
The SET command without any arguments displays all environment variables along with their values; SET " ", zero or more spaces, will include internal variables too. In CMD.EXE , it is possible to assign local variables that will not be global using the SETLOCAL command and ENDLOCAL to restore the environment.
The set of all global variables is known as the global environment or global state. In compiled languages , global variables are generally static variables , whose extent (lifetime) is the entire runtime of the program, though in interpreted languages (including command-line interpreters ), global variables are generally dynamically allocated ...
The term closure is often used as a synonym for anonymous function, though strictly, an anonymous function is a function literal without a name, while a closure is an instance of a function, a value, whose non-local variables have been bound either to values or to storage locations (depending on the language; see the lexical environment section below).
The runtime environment allocates threads to processors depending on usage, machine load and other factors. The runtime environment can assign the number of threads based on environment variables, or the code can do so using functions. The OpenMP functions are included in a header file labelled omp.h in C/C++.
The spawnle, spawnlpe, spawnve, and spawnvpe calls allow the user to alter the child process's environment by passing a list of environment settings in the envp argument. This argument is an array of character pointers; each pointer (except for the last one) points to a null-terminated string defining an environment variable.
Common Lisp has numerous standard dynamic variables, and so threads cannot be sensibly added to an implementation of the language without these variables having thread-local semantics in dynamic binding. For instance the standard variable *print-base* determines the default radix in which integers are printed. If this variable is overridden ...
Local variables are destroyed when the local block or function that they are declared in is closed. C++ destructors for local variables are called at the end of the object lifetime, allowing a discipline for automatic resource management termed RAII, which is widely used in C++. Member variables are created when the parent object is created.