On (04/27/12 12:06), Mike Frysinger wrote:
> On Friday 27 April 2012 11:02:34 Sergey Senozhatsky wrote:
> > PKG_CHECK_MODULES([LIBNIL], [libnl-1],[],[
> > - PKG_CHECK_MODULES([LIBNIL], [libnl-2.0],[] ,[
> > - PKG_CHECK_MODULES([LIBNIL], [libnl-3.0],[]
> > ,[AC_MSG_ERROR([libnl is required but was not found])])
> > + PKG_CHECK_MODULES([LIBNIL],
> > [libnl-2.0],[AC_DEFINE([HAVE_LIBNL20],[1],[Define if you have libnl-2.0 or
> > higher])],
> > + [
> > + PKG_CHECK_MODULES([LIBNIL], [libnl-3.0 libnl-genl-3.0],
> > + [AC_DEFINE([HAVE_LIBNL20],[1],[Define if
> > you have libnl-3.0 or higher])],
> > + [AC_MSG_ERROR([libnl is required but was
> > not found])])
> > ])
> > ])
>
> does autoheader allow the same symbol to be defined multiple times ? how
> about:
>
Good catch.
I think this is undocumented behavior, which is translated to `do not do that'.
It seems, however, that the last AC_DEFINE() executed wins, and sice we only set
HAVE_LIBNL20 to 1, there is unlikely probability of HAVE_LIBNL20 having some
suprsing value at the end.
Yet I agree, that only one AC_DEFINE() should be reached for HAVE_LIBNL20.
> PKG_CHECK_MODULES([LIBNIL], [libnl-1],[libnl_ver=1],[
> PKG_CHECK_MODULES([LIBNIL], [libnl-2.0],[libnl_ver=2],[
> PKG_CHECK_MODULES([LIBNIL], [libnl-3.0 libnl-genl-3.0],
> [libnl_ver=3],[
> AC_MSG_ERROR([libnl is required but was not found])
> ])
> ])
> ])
> AS_IF([test 1 != "$libnl_ver"], [
> AC_DEFINE([HAVE_LIBNL20], [1], [Define if you have libnl-2.0 or higher])
> ])
>
-ss
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