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8.11 Fortran 77 Support

Automake includes full support for Fortran 77.

Any package including Fortran 77 code must define the output variable ‘F77’ in configure.ac; the simplest way to do this is to use the AC_PROG_F77 macro (see Particular Program Checks in The Autoconf Manual). See Fortran 77 and Autoconf.

A few additional variables are defined when a Fortran 77 source file is seen:

F77 ¶

The name of the Fortran 77 compiler.

FFLAGS ¶

Any flags to pass to the Fortran 77 compiler.

AM_FFLAGS ¶

The maintainer’s variant of FFLAGS.

RFLAGS ¶

Any flags to pass to the Ratfor compiler.

AM_RFLAGS ¶

The maintainer’s variant of RFLAGS.

F77COMPILE ¶

The command used to actually compile a Fortran 77 source file. The file name is appended to form the complete command line.

FLINK ¶

The command used to actually link a pure Fortran 77 program or shared library.

Automake can handle preprocessing Fortran 77 and Ratfor source files in addition to compiling them⁶. Automake also contains some support for creating programs and shared libraries that are a mixture of Fortran 77 and other languages (see Mixing Fortran 77 With C and C++).

These issues are covered in the following sections.

• Preprocessing Fortran 77
• Compiling Fortran 77 Files
• Mixing Fortran 77 With C and C++
• Fortran 77 and Autoconf