From: Vladislav Vaintroub
Date: February 4 2011 2:12pm
Subject: RE: review of bug#42969
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> -----Original Message-----
> From: Guilhem Bichot [mailto:guilhem.bichot@stripped]
> Sent: Freitag, 4. Februar 2011 14:53
> To: Vladislav Vaintroub
> Cc: 'Joerg Bruehe'; 'commits'
> Subject: Re: review of bug#42969
>=20
> Vladislav Vaintroub a =E9crit, Le 04.02.2011 14:42:
> >
> >> -----Original Message-----
> >> From: Joerg Bruehe [mailto:joerg.bruehe@stripped]
> >> Sent: Freitag, 4. Februar 2011 12:23
> >> To: Guilhem Bichot
> >> Cc: commits
> >> Subject: Re: review of bug#42969
> >>
> >> Hello Guilhem,
> >
> >
> >> Probably, that is the result of "@ONLY":
> >> For most of cmake's variables, simply using them "${CMAKE_SYSTEM}" =
is
> >> not enough, you first need the "SET" line:
> >>    SET(CMAKE_SYSTEM "@CMAKE_SYSTEM@")
> >
> > Joerg, Guilhem.
> >
> > Maybe it makes things a bit cleared with my explanation, I'll try ..
>=20
> Thanks Wlad! Yes it makes things clearer. If I understood correctly,
> @variable is known by cmake when processing CONFIGURE_FILE, and is
> substituted (like @ works in autoconf), and $variable is known by =
cmake
> when working as a script.

CONFIGURE_FILE()  can substitute both ${var } and @var@, however=20
${var} substitution  is not always desired, one would have to this care =
of quoting
If variable is replaced etc.  So  it is pretty  common to use @ONLY =
parameter.
 In this case  ${var}  like stuff  is left as is, and  @var@  is =
replaced.

Btw,=20

shell>cmake --help-command configure_file

shows  a reasonable doc on this topic.
=20
Wlad.