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On some platforms, such as Windows, executables are expected to have an extension such as `.exe'. On these platforms, some compilers (GCC among them) will automatically generate `foo.exe' when asked to generate `foo'.
Automake provides mostly-transparent support for this. Unfortunately the support isn't completely transparent; if you want your package to support these platforms then you must assist.
One thing you must be aware of is that, internally, Automake rewrites something like this:
bin_PROGRAMS = liver
to this:
bin_PROGRAMS = liver$(EXEEXT)
The targets Automake generates are likewise given the `$(EXEEXT)'
extension. EXEEXT
However, Automake cannot apply this rewriting to configure
substitutions. This means that if you are conditionally building a
program using such a substitution, then your `configure.in' must
take care to add `$(EXEEXT)' when constructing the output variable.
With Autoconf 2.13 and earlier, you must explicitly use AC_EXEEXT
to get this support. With Autoconf 2.50, AC_EXEEXT is run
automatically if you configure a compiler (say, through
AC_PROG_CC).
Sometimes maintainers like to write an explicit link rule for their program. Without executable extension support, this is easy--you simply write a target with the same name as the program. However, when executable extension support is enabled, you must instead add the `$(EXEEXT)' suffix.
Unfortunately, due to the change in Autoconf 2.50, this means you must
always add this extension. However, this is a problem for maintainers
who know their package will never run on a platform that has executable
extensions. For those maintainers, the no-exeext option
(see section Changing Automake's Behavior) will disable this feature. This works in a fairly
ugly way; if no-exeext is seen, then the presence of a target
named foo in `Makefile.am' will override an
automake-generated target of the form foo$(EXEEXT). Without the
no-exeext option, this use will give an error.
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