build on Windows: shared object extension not set to 'dll' (to 'so' instead)

[Jannick]

Hi everyone,



when building gawk on a Windows system, the expected extension of shared
objects is effectively set to 'so' instead of 'dll'; see the following snip
from configure.ac:



dnl Crude but small hack to make plug-ins work on Mac OS X

dnl We should really use the libtool value for shrext_cmds, but that

dnl is not available here, since we do not use libtool at the top level.

case $acl_shlibext in

dylib)    GAWKLIBEXT=so ;;         # MacOS uses .dylib for shared libraries,
but libtool uses .so for modules

*) GAWKLIBEXT=$acl_shlibext ;;

esac

AC_SUBST(GAWKLIBEXT)



This makes the use of gawk extensions (dll's) on Windows a bit difficult,
since gawk has a hard time to find extension files: e.g. '@load "abc"' (in a
gawk script) or '-labc' (on the command line) does not work as on other
platforms, unfortunately.





Happy to send a minimal patch fixing this by setting GAWKLIBEXT=dll on
Windows.



Best,

J.