What the Compiler Does by Default

By default, the compiler driver generates executable file(s) of the input file(s) and performs the following actions:

• Displays certain diagnostic messages, warnings, and errors.
• Performs default settings and optimizations, unless these options are overridden by specific options settings.
• Searches for source files in the current directory or in the directory path explicitly specified before a file name (for example, looks in "src" when the directory path is src\test.f90).
• Searches for include and module files in: 
• The directory path explicitly specified before a file name (for example, looks in "src" when the including source is specified as src\test.f90)
• The current directory
• The directory specified by using the -module path (Linux* OS and Mac OS* X) or /module:path (Windows* OS)  option (for all module files)
• The directory specified by using the -Idir ((Linux OS and Mac OS X) or /Idir (Windows OS) option (for module files referenced in USE statements and include files referenced in INCLUDE statements. )
• For Windows OS, the include path specified by the INCLUDE environment variable (for all include or module files)
• Any directory explicitly specified in any INCLUDE within an included file
• Passes options designated for linking as well as user-defined libraries to the linker. The linker searches for any library files in directories specified by the LIB variable, if they are not found in the current directory. 

For unspecified options, the compiler uses default settings or takes no action.

You may want to use the  -assume keyword (Linux OS and Mac OS X) or /assume:keyword (Windows OS) option to instruct the compiler to make certain assumptions. For example, -assume buffered_io tells the compiler to accumulate records in a buffer. For more information and the complete list of supported keywords, see the assume option reference page.

Note

On operating systems that support characters in Unicode* (multi-byte) format, the compiler will process file names containing Unicode* characters.