• There are many compiler options. Below are just a few, some of which might be of particular interest.

• -V
  Creates a listing file of the source file with various compile-time information appended. The name of the listing file is the basename of the source file with a .l substituted for the .f, .for, or .FOR. How you compile source files determines how the listing file is created. If you compile several source files together, one listing file is created (named with the basename of the first input file and the .l suffix). If you compile source files one at a time, a separate listing file is created for each input file (named with the basename of the input file and the .l suffix).

• -u
  Makes the default type of a variable undefined (IMPLICIT NONE), which causes the compiler to issue a warning for any undeclared symbols (same as the -warn declarations option). This behavior differs from default FORTRAN rules.

• -warn declarations
  Makes the default type of a variable undefined (IMPLICIT NONE), which causes the compiler to issue a warning for any undeclared symbols. This behavior differs from default FOR- TRAN rules. The default is -warn nodeclarations.

• -check bounds
  Generates code to perform run-time checks on subscript and substring expressions. An error is reported if the expression is outside the dimension of the array or the length of the string. The default is -check nobounds.

• -real_size 32
  Defines REAL declarations, constants, functions, and intrin- sics as REAL*4, and defines COMPLEX declarations, constants, functions, and intrinsics as COMPLEX (COMPLEX*8). This is the default.

• -real_size 64
  Defines REAL declarations, constants, functions, and intrin- sics as DOUBLE PRECISION (REAL*8), and defines COMPLEX declarations, constants, functions, and intrinsics as DOUBLE COMPLEX (COMPLEX*16). The default is -real_size 32.

• -show include
  Includes in the listing (if one is generated with -V ), any text file specified with INCLUDE in the source program. The default is -show noinclude.

• -show nomap
  Excludes from the listing (if one is generated with -V ), information about the symbols used in the source program. The default is -show map.

• -show xref
  Includes in the listing (if one is generated with -V ), a cross-reference of all symbols used in the source program, along with line numbers of definitions and uses (same as the -cross_reference option). The default is -show noxref.

• -warn argument_checking
  Enables warnings about argument mismatches between caller and callee, when compiled together. The default is -warn noargument_checking.

• -warn nouncalled
  Suppresses warning messages when a statement function is never called. The default is -warn uncalled.

• -warn nouninitialized
  Suppresses warning messages for a variable that is used before a value is assigned to it. The default is -warn uninitialized.

• -warn nounreachable
  Suppresses warning messages for a section of code that is unreachable (no path to it). The default is -warn unreachable.

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