Re: [Powertop] [PATCH v3 02/15] configure: prefer AS_IF macro rather than shell if statement

[Joe Konno <joe.konno at linux.intel.com>]

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LGTM.

Reviewed-By: Joe Konno <joe.konno(a)intel.com>

On 09/07/2014 02:27 PM, Sami Kerola wrote:
> Jumping in between shell and m4 syntaxes makes reading the code more
> difficult, so stick to m4 when ever possible.
> 
> Signed-off-by: Sami Kerola <kerolasa(a)iki.fi>
> ---
>  configure.ac | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/configure.ac b/configure.ac
> index b41cfb3..4991d97 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -108,23 +108,25 @@ dnl libnl-2 provides only libnl-2.0.pc file, so we check for separate
>  dnl libnl-genl-3.0.pc pkg-config file just for libnl-3.0 case.
>  PKG_CHECK_MODULES([LIBNL], [libnl-3.0 >= 3.0 libnl-genl-3.0 >= 3.0], [has_libnl_ver=3], [
>  	PKG_CHECK_MODULES([LIBNL], [libnl-2.0 >= 2.0], [has_libnl_ver=2], [
> -		PKG_CHECK_MODULES([LIBNL], [libnl-1], [has_libnl_ver=1], [has_libnl_ver=0])])])
> -if (test "$has_libnl_ver" -eq 0); then
> -	AC_MSG_ERROR(libnl and libnl-genl are required but were not found)
> -fi
> -if (test "$has_libnl_ver" -gt 1); then
> +		PKG_CHECK_MODULES([LIBNL], [libnl-1], [has_libnl_ver=1], [has_libnl_ver=0])
> +	])
> +])
> +AS_IF([test "$has_libnl_ver" -eq 0], [
> +	AC_MSG_ERROR([libnl and libnl-genl are required but were not found])
> +])
> +AS_IF([test "$has_libnl_ver" -gt 1], [
>  	AC_DEFINE([HAVE_LIBNL20], [1], [Define if you have libnl-2.0 or higher])
> -fi
> +])
>  
> -if (test "$has_libpci" -eq 0); then 
> -	AC_DEFINE([HAVE_NO_PCI],[1],[Define if pci is not supported])
> +AS_IF([test "$has_libpci" -eq 0], [
> +	AC_DEFINE([HAVE_NO_PCI], [1], [Define if pci is not supported])
>          AC_MSG_WARN([
>  			************* LIBPCI SUPPORT NOT CONFIGURED**************
>  			If you need or want pci support, please install libpci 
>  			and re-configure PowerTOP. 
>  			*********************************************************
>  	])
> -fi
> +])
>  
>  AC_SEARCH_LIBS([pthread_create], [pthread], [], [
>  	AC_MSG_ERROR([libpthread is required but was not found])
>