build: fix autoconf warnings

autoconf complains about three obsolete macros.

`AC_CONFIG_HEADER` has been superseded by `AC_CONFIG_HEADERS`, so
replace it.

`AM_PROG_LEX` calls `AC_PROG_LEX` with no arguments, but this usage is
deprecated.  The only difference between `AM_PROG_LEX` and `AC_PROG_LEX`
is that the former defines `$LEX` as "./build-aux/missing lex" if no lex
is found to ensure a useful error is reported when make is run.  How-
ever, the configure script checks that we have a working lex and exits
with an error if none is available, so `$LEX` will never be called and
we can replace `AM_PROG_LEX` with `AC_PROG_LEX`.

`AM_PROG_LIBTOOL` has been superseded by `LT_INIT`, which is already in
configure.ac, so remove it.

We can also replace `AC_DISABLE_STATIC` with an argument to `LT_INIT`.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
---
 configure.ac | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

On 2021-12-15, at 18:44:40 +0000, Jeremy Sowden wrote:
> autoconf complains about three obsolete macros.
>
> `AC_CONFIG_HEADER` has been superseded by `AC_CONFIG_HEADERS`, so
> replace it.
>
> `AM_PROG_LEX` calls `AC_PROG_LEX` with no arguments, but this usage is
> deprecated.  The only difference between `AM_PROG_LEX` and `AC_PROG_LEX`
> is that the former defines `$LEX` as "./build-aux/missing lex" if no lex
> is found to ensure a useful error is reported when make is run.  How-
> ever, the configure script checks that we have a working lex and exits
> with an error if none is available, so `$LEX` will never be called and
> we can replace `AM_PROG_LEX` with `AC_PROG_LEX`.
>
> `AM_PROG_LIBTOOL` has been superseded by `LT_INIT`, which is already in
> configure.ac, so remove it.
>
> We can also replace `AC_DISABLE_STATIC` with an argument to `LT_INIT`.
>
> Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
> ---
>  configure.ac | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index bb65f749691c..503883f28c66 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -9,7 +9,7 @@ AM_INIT_AUTOMAKE([-Wall foreign subdir-objects
>  dnl kernel style compile messages
>  m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
>
> -AC_CONFIG_HEADER([config.h])
> +AC_CONFIG_HEADERS([config.h])
>
>  AC_ARG_ENABLE([debug],
>  	      AS_HELP_STRING([--disable-debug], [Disable debugging symbols]),
> @@ -26,7 +26,7 @@ AC_PROG_CC
>  AC_PROG_MKDIR_P
>  AC_PROG_INSTALL
>  AC_PROG_SED
> -AM_PROG_LEX
> +AC_PROG_LEX([noyywrap])
>  AC_PROG_YACC
>
>  if test -z "$ac_cv_prog_YACC" -a ! -f "${srcdir}/src/parser_bison.c"
> @@ -43,11 +43,9 @@ then
>  fi
>
>  AM_PROG_AR
> -AM_PROG_LIBTOOL
> -LT_INIT
> +LT_INIT([disable-static])
>  AM_PROG_CC_C_O
>  AC_EXEEXT
> -AC_DISABLE_STATIC
>  CHECK_GCC_FVISIBILITY
>
>  AS_IF([test "x$enable_man_doc" = "xyes"], [
> --
> 2.34.1
>
>

Forgot to set the subject-prefix to "nft".

Apologies,

J.

On Wed, Dec 15, 2021 at 06:44:40PM +0000, Jeremy Sowden wrote:
> autoconf complains about three obsolete macros.
> 
> `AC_CONFIG_HEADER` has been superseded by `AC_CONFIG_HEADERS`, so
> replace it.
> 
> `AM_PROG_LEX` calls `AC_PROG_LEX` with no arguments, but this usage is
> deprecated.  The only difference between `AM_PROG_LEX` and `AC_PROG_LEX`
> is that the former defines `$LEX` as "./build-aux/missing lex" if no lex
> is found to ensure a useful error is reported when make is run.  How-
> ever, the configure script checks that we have a working lex and exits
> with an error if none is available, so `$LEX` will never be called and
> we can replace `AM_PROG_LEX` with `AC_PROG_LEX`.
> 
> `AM_PROG_LIBTOOL` has been superseded by `LT_INIT`, which is already in
> configure.ac, so remove it.
> 
> We can also replace `AC_DISABLE_STATIC` with an argument to `LT_INIT`.

Also applied, thanks.