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(autoconf.info)Fortran 77 Compiler Characteristics

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Fortran 77 Compiler Characteristics
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   The following macros check for Fortran 77 compiler characteristics.
To check for characteristics not listed here, use `AC_TRY_COMPILE'
(Note: Examining Syntax) or `AC_TRY_RUN' (Note: Run Time), making
sure to first set the current lanuage to Fortran 77 `AC_LANG_FORTRAN77'
(Note: Language Choice).

 - Macro: AC_F77_LIBRARY_LDFLAGS
     Determine the linker flags (e.g. `-L' and `-l') for the "Fortran
     77 intrinsic and run-time libraries" that are required to
     successfully link a Fortran 77 program or shared library.  The
     output variable `FLIBS' is set to these flags.

     This macro is intended to be used in those situations when it is
     necessary to mix, e.g. C++ and Fortran 77 source code into a single
     program or shared library (*note Mixing Fortran 77 With C and C++:
     (automake)Mixing Fortran 77 With C and C++.).

     For example, if object files from a C++ and Fortran 77 compiler
     must be linked together, then the C++ compiler/linker must be used
     for linking (since special C++-ish things need to happen at link
     time like calling global constructors, instantiating templates,
     enabling exception support, etc.).

     However, the Fortran 77 intrinsic and run-time libraries must be
     linked in as well, but the C++ compiler/linker doesn't know by
     default how to add these Fortran 77 libraries.  Hence, the macro
     `AC_F77_LIBRARY_LDFLAGS' was created to determine these Fortran 77
     libraries.