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13.4.5 `configure.in' at top level
----------------------------------
`configure.in' or `configure.ac' - this is the source from which
`autoconf' generates the `configure' script.
1. Declare the package and version.
This is done by a set of lines like these:
PACKAGE=gettext
VERSION=0.16.1
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE")
AC_DEFINE_UNQUOTED(VERSION, "$VERSION")
AC_SUBST(PACKAGE)
AC_SUBST(VERSION)
or, if you are using GNU `automake', by a line like this:
AM_INIT_AUTOMAKE(gettext, 0.16.1)
Of course, you replace `gettext' with the name of your package,
and `0.16.1' by its version numbers, exactly as they should appear
in the packaged `tar' file name of your distribution
(`gettext-0.16.1.tar.gz', here).
2. Check for internationalization support.
Here is the main `m4' macro for triggering internationalization
support. Just add this line to `configure.in':
AM_GNU_GETTEXT
This call is purposely simple, even if it generates a lot of
configure time checking and actions.
If you have suppressed the `intl/' subdirectory by calling
`gettextize' without `--intl' option, this call should read
AM_GNU_GETTEXT([external])
3. Have output files created.
The `AC_OUTPUT' directive, at the end of your `configure.in' file,
needs to be modified in two ways:
AC_OUTPUT([EXISTING CONFIGURATION FILES intl/Makefile po/Makefile.in],
[EXISTING ADDITIONAL ACTIONS])
The modification to the first argument to `AC_OUTPUT' asks for
substitution in the `intl/' and `po/' directories. Note the `.in'
suffix used for `po/' only. This is because the distributed file
is really `po/Makefile.in.in'.
If you have suppressed the `intl/' subdirectory by calling
`gettextize' without `--intl' option, then you don't need to add
`intl/Makefile' to the `AC_OUTPUT' line.
If, after doing the recommended modifications, a command like
`aclocal -I m4' or `autoconf' or `autoreconf' fails with a trace
similar to this:
configure.ac:44: warning: AC_COMPILE_IFELSE was called before AC_GNU_SOURCE
../../lib/autoconf/specific.m4:335: AC_GNU_SOURCE is expanded from...
m4/lock.m4:224: gl_LOCK is expanded from...
m4/gettext.m4:571: gt_INTL_SUBDIR_CORE is expanded from...
m4/gettext.m4:472: AM_INTL_SUBDIR is expanded from...
m4/gettext.m4:347: AM_GNU_GETTEXT is expanded from...
configure.ac:44: the top level
configure.ac:44: warning: AC_RUN_IFELSE was called before AC_GNU_SOURCE
you need to add an explicit invocation of `AC_GNU_SOURCE' in the
`configure.ac' file - after `AC_PROG_CC' but before `AM_GNU_GETTEXT',
most likely very close to the `AC_PROG_CC' invocation. This is
necessary because of ordering restrictions imposed by GNU autoconf.
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