Driver

The driver parses the f90 command line by which you invoke the compiler, calls each subprocess as needed to complete the compilation, and retains control throughout the compilation process.

Compile-line options that control driver functions enable you to do the following:

Call subprocesses that you want to substitute for those that f90 calls by default
Pass arguments to a subprocess
Get a summary listing of all options supported by the compiler
Display information about the version of f90 you are using
Control the level of information that the driver displays about the compilation process

Table 1-1 “Options for controlling the f90 driver” lists and briefly describes the options that control the driver.

Table 1-1 Options for controlling the f90 driver

Option	Function
`-c`	Suppress the link phase and produce an object file (`.o`) from each source file on the command line.
`-o` `outfile`	Name the output file `outfile` instead of the default file name (`a.out` or `filename``.o`). If linking has been suppressed, the front end uses this option to name the object file.
`+pre_include=``file`	Process contents of `file` before all source files specified on the command line. The command line can have multiple occurrences of this option, each specifying a different `file`; they are processed in the specified order.
`-t``x``,``name`	Substitute a private version (`name`) of one or more subprocesses (`x`) of the compilation. The values for `x` are: `a` Assembler `c` Compiler `l` Linker `p` C preprocessor `s` Startup file (`crt0.o` library) `e` Debug file (`end.o` library) If you compile and link separately and specify `+tl` on the compile line, you must also specify it on the link line.
`+usage`	List and briefly describe all `f90` options.
`-v`	Print verbose information to standard output as program is compiled.
`+version`	Write compiler version information to standard output, without compiling.
`-W``x``,``arg1``[,``arg2``,...,``argN``]`	Pass `arg1` through `argN` to a subprocess of the compilation, identified by `x`. The values for `x` are: `a` Assembler `c` Compiler `l` Linker `p` C preprocessor If you compile and link separately and specify `+Wl` on the compile line, you must also specify it on the link line.

Driver

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