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build: don't require flex for ordinary builds

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* configure.ac (LEX): Don't fail if this is lex, as flex is not
required for ordinary builds.  Instead, issue a warning and
substitute a no-op LEX.  Reported by Michael Felt in
<http://lists.gnu.org/archive/html/bug-bison/2013-08/msg00009.html>.
This commit is contained in:
Paul Eggert
2013-08-24 18:22:22 -07:00
parent 0149d39e6e
commit b5e27aa262
1 changed files with 4 additions and 1 deletions
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5
configure.ac
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@@ -175,7 +175,10 @@ AC_SUBST([YACC_LIBRARY])
# Checks for programs. # Checks for programs.
AM_MISSING_PROG([DOT], [dot]) AM_MISSING_PROG([DOT], [dot])
AC_PROG_LEX AC_PROG_LEX
$LEX_IS_FLEX || AC_MSG_ERROR([Flex is required]) $LEX_IS_FLEX || test "X$LEX" = X: || {
AC_MSG_WARN([bypassing lex because flex is required])
LEX=:
}
AC_PROG_YACC AC_PROG_YACC
AC_PROG_RANLIB AC_PROG_RANLIB
AC_PROG_GNU_M4 AC_PROG_GNU_M4