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Try to improve bison check so it works on bsd

This commit is contained in:
Dave Davenport 2020-09-03 21:08:17 +02:00
parent e4e59b99ea
commit 5deac0a697

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@ -10,7 +10,27 @@ dnl ---------------------------------------------------------------------
AC_PROG_LEX([flex])
AC_PROG_YACC
AS_IF([test "x${YACC}" != "xbison -y" ], [AC_MSG_ERROR( "Failed to find bison")])
AC_DEFUN([AX_PROG_BISON], [
AC_REQUIRE([AC_PROG_YACC])
AC_REQUIRE([AC_PROG_EGREP])
AC_CACHE_CHECK([if bison is the parser generator],[ax_cv_prog_bison],[
AS_IF([$YACC --version 2>/dev/null | $EGREP -q '^bison '],
[ax_cv_prog_bison=yes], [ax_cv_prog_bison=no])
])
AS_IF([test "$ax_cv_prog_bison" = "yes"], [
dnl replace the yacc-compatible compiler with the real bison, as
dnl otherwise autoconf limits us to the POSIX yacc.
dnl We also change the generated filename to the old one, so that
dnl automake's ylwrap can deal with it.
YACC="${YACC% -y} -o y.tab.c"
] m4_ifnblank([$1], [[$1]]),
m4_ifnblank([$2], [[$2]])
)
])
AX_PROG_BISON([],[AC_MSG_ERROR("Failed to find bison")])
m4_include([m4/ax_prog_flex_version.m4])
m4_include([m4/ax_compare_version.m4])