(automake-1.16.info)Libtool Modules

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8.3.6 Libtool Modules
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These are libtool libraries meant to be dlopened.  They are indicated to
libtool by passing ‘-module’ at link-time.

     pkglib_LTLIBRARIES = mymodule.la
     mymodule_la_SOURCES = doit.c
     mymodule_la_LDFLAGS = -module

   Ordinarily, Automake requires that a library’s name start with ‘lib’.
However, when building a dynamically loadable module you might wish to
use a "nonstandard" name.  Automake will not complain about such
nonstandard names if it knows the library being built is a libtool
module, i.e., if ‘-module’ explicitly appears in the library’s
‘_LDFLAGS’ variable (or in the common ‘AM_LDFLAGS’ variable when no
per-library ‘_LDFLAGS’ variable is defined).

   As always, ‘AC_SUBST’ variables are black boxes to Automake since
their values are not yet known when ‘automake’ is run.  Therefore if
‘-module’ is set via such a variable, Automake cannot notice it and will
proceed as if the library was an ordinary libtool library, with strict
naming.

   If ‘mymodule_la_SOURCES’ is not specified, then it defaults to the
single file ‘mymodule.c’ (Note: Default _SOURCES).