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Conditional AC_DEFINE with m4_define variable?


From: Jef Driesen
Subject: Conditional AC_DEFINE with m4_define variable?
Date: Sat, 22 Dec 2012 15:52:35 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0

Hi,

When I set a variable with:

m4_define([dc_version_suffix],[devel])

or leave it empty:

m4_define([dc_version_suffix],[])

And then try to conditionally call AC_DEFINE based on whether the dc_version_suffix is set or not, this doesn't work:

AS_IF([test "x$dc_version_suffix" = "xdevel"], [
   AC_DEFINE(ENABLE_PTY, [1], [Enable pseudo terminal support.])
])

However if I use m4_isset, then it does kind of work, except that the USE_REVISION macro in the config.h is either defined, or not present at all.

m4_ifset([dc_version_suffix],[
   AC_DEFINE(USE_REVISION, [1], [Use the revision number.])
])

Does anyone know how to implement this correctly?

Jef




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