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The following diagram demonstrates under what conditions a particular linker is chosen by Automake.
For example, if Fortran 77, C and C++ source code were to be compiled
into a program, then the C++ linker will be used. In this case, if the
C or Fortran 77 linkers required any special libraries that weren’t
included by the C++ linker, then they must be manually added to an
_LDADD or _LIBADD variable by the user writing the
Makefile.am.
\ Linker
source \
code \ C C++ Fortran
----------------- +---------+---------+---------+
| | | |
C | x | | |
| | | |
+---------+---------+---------+
| | | |
C++ | | x | |
| | | |
+---------+---------+---------+
| | | |
Fortran | | | x |
| | | |
+---------+---------+---------+
| | | |
C + C++ | | x | |
| | | |
+---------+---------+---------+
| | | |
C + Fortran | | | x |
| | | |
+---------+---------+---------+
| | | |
C++ + Fortran | | x | |
| | | |
+---------+---------+---------+
| | | |
C + C++ + Fortran | | x | |
| | | |
+---------+---------+---------+