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(g77-295.info)Inconsistent Calling Sequences

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Inconsistent Calling Sequences
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   Code containing inconsistent calling sequences in the same file is
normally rejected--see Note: GLOBALS.  (Use, say, `ftnchek' to ensure
consistency across source files.  Note: Generating Skeletons and
Prototypes with `f2c'.)

   Mysterious errors, which may appear to be code generation problems,
can appear specifically on the x86 architecture with some such
inconsistencies.  On x86 hardware, floating-point return values of
functions are placed on the floating-point unit's register stack, not
the normal stack.  Thus calling a `REAL' or `DOUBLE PRECISION'
`FUNCTION' as some other sort of procedure, or vice versa, scrambles
the floating-point stack.  This may break unrelated code executed
later.  Similarly if, say, external C routines are written incorrectly.