Fortran 77 Compiler Characteristics

The following macros check for Fortran 77 compiler characteristics. To check for characteristics not listed here, use AC_TRY_COMPILE (see section Examining Syntax) or AC_TRY_RUN (see section Checking Run Time Behavior), making sure to first set the current lanuage to Fortran 77 AC_LANG_FORTRAN77 (see section 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 (see section `Mixing Fortran 77 With C and C++' in GNU Automake).

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.

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