[ILUG] makefile problems

[Lars Hecking]

Miles writes:
> I'm trying to hack up a makefile for a project here, and I'm hitting a
> few probs. Basically, it's extending a makefile that already exists to
> add some new features into a CORBA ORB. I'm trying to add in an extra
> flag to the configure command, which will add an extra #define to a .h
> file. i.e.
> 
> "--enable-moss" - adds '#define HAVE_MOSS 1' to a config.h file
> 
> In the configure file, the enable flags copy the #defines to a
> confdefs.h file, which is then transformed into a sed script which puts
> the vals into config.h.  My #define is getting through to the
> confdefs.h, but doesn't make it to the config.h file. The problem is
> somewhere in the sed bit, which I know sweet fsck-all about, never
> having looked at sed before. I know this isn't much info to go on, but
> can any sed-knowlegeable people here maybe take a guess at the reasons
> why one line in particular out of about 50 in the input to the sed
> script isn't getting echoed through?  
 
 Don't mess around with configure - you change configure.in and then use
 autoconf to regenerate configure. confdefs.h is a temporary file created
 by configure.

 To add another --enable-moss option, put the following into configure.in:

AC_ARG_ENABLE(moss,dnl
[  --enable-moss    Enable the miraculous moss feature],
 ACTION-IF-GIVEN,
 ACTION-IF-NOT-GIVEN
)dnl

 If --enable-moss or --disable-moss is specified, ACTION-IF-GIVEN is
 executed, otherwise ACTION-IF-NOT-GIVEN. These actions should access
 one of two variables, enableval or enable_moss, test whether the variable
 is set yes or no, and execute code accordingly. Example (using autoconf 2.13):

AC_ARG_ENABLE(moss,dnl
[  --enable-moss         <help text>],
test "$enableval" = yes && \
  AC_DEFINE(HAVE_MOSS,1,[<config.h help text for moss. ])
)

 Here, ACTION-IF-NOT-GIVEN is empty. Replace the text in angle brackets <>
 with your own. <help text> will appear with ./configure --help,
 <config.h help text for moss. will accompany the define in config.h.

 If you have only autoconf < 2.13, replace above AC_DEFINE with
 AC_DEFINE(HAVE_MOSS,1), manually add

/* <config.h help text for moss.  */
#undef HAVE_MOSS

 to acconfig.h, and run autoheader to create config.h.in.

 Recommended reading: the GNU autoconf manual.

-- 
i'm living so far beyond my income that we may almost be said to be
living apart.
                -- e. e. cummings