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build: work around AC_PROG_LEX deprecation warning

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`AC_PROG_LEX without either yywrap or noyywrap is obsolete`, says
autoconf 2.70.  Sadly, there is no transition window for this, in 2.69
the macro takes no arguments.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2021-11-11 11:57:59 +01:00
parent 933a8c8a4c
commit 6125c10c29
1 changed files with 10 additions and 1 deletions
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11
configure.ac
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@ -2235,7 +2235,16 @@ dnl --------------------------------------
dnl checking for flex and bison
dnl --------------------------------------
AM_PROG_LEX
dnl autoconf 2.69 AC_PROG_LEX has no parameters
dnl autoconf 2.70 AC_PROG_LEX prints a deprecation warning without params
m4_if(m4_version_compare(m4_defn([AC_AUTOCONF_VERSION]), [2.70]), [-1], [dnl
dnl autoconf < 2.70
AC_PROG_LEX
], [
dnl autoconf >= 2.70
AC_PROG_LEX([noyywrap])
])
AC_MSG_CHECKING([version of flex])
frr_ac_flex_version="$(eval $LEX -V | grep flex | head -n 1)"
frr_ac_flex_version="${frr_ac_flex_version##* }"