Re: [PATCH] Don't abuse $(prefix) for finding build-time files.

[Thomas Schwinge]

Hello!

On Fri, Jun 19, 2009 at 12:21:17AM +0300, Sergiu Ivanov wrote:
> On Wed, Jun 17, 2009 at 12:40:56AM +0200, Thomas Schwinge wrote:
> > +%.sdefsi:
> > +   echo '#include <hurd/$*.defs>' | \
> > +     $(CPP) \
> > +       $(CPPFLAGS) $(MIGSFLAGS) $($*-MIGSFLAGS) -DSERVERPREFIX=S_ \
> > +       -x c - -o $@
> 
> Could you please explain what this expression does? Does it somehow
> inject the #include statement into the code of fs_notifyServer.c?..

The echo statement does the obvious, replacing $* with the so-called stem
(see the Make info manual; the stem is the % part of the target).  I.e.,
for ``make foo.sdefsi'' we'll get ``#include <hurd/foo.defs>''.  This
line of code is piped into GCC (same compiler flags and output file as
before), but additionally GCC is told to read C language source code (-x
c) from stdin (-).


Regards,
 Thomas

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