automake-1.16: Mixing Fortran 77 With C and C++
8.14.3 Mixing Fortran 77 With C and C++
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Automake currently provides _limited_ support for creating programs and
shared libraries that are a mixture of Fortran 77 and C and/or C++.
However, there are many other issues related to mixing Fortran 77 with
other languages that are _not_ (currently) handled by Automake, but that
are handled by other packages(1).
Automake can help in two ways:
1. Automatic selection of the linker depending on which combinations
of source code.
2. Automatic selection of the appropriate linker flags (e.g., ‘-L’ and
‘-l’) to pass to the automatically selected linker in order to link
in the appropriate Fortran 77 intrinsic and run-time libraries.
These extra Fortran 77 linker flags are supplied in the output
variable ‘FLIBS’ by the ‘AC_F77_LIBRARY_LDFLAGS’ Autoconf macro.
⇒Fortran Compiler Characteristics (autoconf)Fortran Compiler.
If Automake detects that a program or shared library (as mentioned in
some ‘_PROGRAMS’ or ‘_LTLIBRARIES’ primary) contains source code that is
a mixture of Fortran 77 and C and/or C++, then it requires that the
macro ‘AC_F77_LIBRARY_LDFLAGS’ be called in ‘configure.ac’, and that
either ‘$(FLIBS)’ appear in the appropriate ‘_LDADD’ (for programs) or
‘_LIBADD’ (for shared libraries) variables. It is the responsibility of
the person writing the ‘Makefile.am’ to make sure that ‘$(FLIBS)’
appears in the appropriate ‘_LDADD’ or ‘_LIBADD’ variable.
For example, consider the following ‘Makefile.am’:
bin_PROGRAMS = foo
foo_SOURCES = main.cc foo.f
foo_LDADD = libfoo.la $(FLIBS)
pkglib_LTLIBRARIES = libfoo.la
libfoo_la_SOURCES = bar.f baz.c zardoz.cc
libfoo_la_LIBADD = $(FLIBS)
In this case, Automake will insist that ‘AC_F77_LIBRARY_LDFLAGS’ is
mentioned in ‘configure.ac’. Also, if ‘$(FLIBS)’ hadn’t been mentioned
in ‘foo_LDADD’ and ‘libfoo_la_LIBADD’, then Automake would have issued a
warning.
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