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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