Subj : Re: Makefile question relating to conditional
To   : comp.programming
From : William
Date : Sun Sep 25 2005 12:49 pm

"Willem" <willem@stack.nl> wrote in message
news:slrndja7ia.2kgp.willem@toad.stack.nl...
> hzmonte@hotmail.com wrote:
> ) I inherit a Makefile that has the following rule:
> )
> ) target:       main.c
> )         if ( `uname` == "SunOS" ) $(CC) $(CFLAGS) $(LDFLAGS_SOL)
> ) main.c $(DEBUGOBJ) -o main
> )         if ( `uname` == "Linux" ) $(CC) $(CFLAGS) $(LDFLAGS_LINUX)
> ) main.c $(DEBUGOBJ) -o main
> )
> ) It is to be run by GNU gmake, and it does seem to run okay.
>
> Plain vanilla make will run it fine as well.
>
> ) But I am not able to see anywhere in the GNU Make manual that says
> ) gmake supports an if conditional with the above syntax.  It supports
> ) ifeq, ifneq, etc, but not if(...==...).  Is this an undocumented
> ) feature of gmake?
>
> 'if' is not part of gmake.  It is part of sh.  gmake (or make) just runs
> the whole line as a command.  Try typing the following on your
commandline:

It's not part of sh (bourn shell, ksh, bash, etc.) either, it's
c shell syntax. Bourne shell syntax would be something like:

    if [ `uname` = "SunOS" ] ; then $(CC) $(CFLAGS) $(LDFLAGS_SOL)
or
    [ `uname` = "SunOS" ] && $(CC) $(CFLAGS) $(LDFLAGS_SOL)

-Wm

.