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configure: don't require Flex

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Flex should not be required to build Bison or run the test suite (of
course it is needed for maintaining Bison).  Yet the Automake
conditional FLEX_WORKS does not work.

* m4/flex.m4 (_AC_PROG_LEX_YYTEXT_DECL): Since this is called
conditionally, don't define LEX_IS_FLEX here, but rather...
(AC_PROG_LEX): here.
* configure.ac: Be more cautious about possibly undefined variables.
This commit is contained in:
Akim Demaille
2019-10-08 08:34:13 +02:00
parent d4b6c86c7f
commit 825150b085
2 changed files with 6 additions and 5 deletions
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4
configure.ac
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@@ -211,10 +211,10 @@ AC_CONFIG_FILES([src/yacc], [chmod +x src/yacc])
# Checks for programs.
AM_MISSING_PROG([DOT], [dot])
AC_PROG_LEX
$LEX_IS_FLEX || test "X$LEX" = X: || {
if ! "$LEX_IS_FLEX" || test "X$LEX" = X:; then
AC_MSG_WARN([bypassing lex because flex is required])
LEX=:
}
fi
AM_CONDITIONAL([FLEX_WORKS], [$LEX_IS_FLEX])
AM_CONDITIONAL([FLEX_CXX_WORKS],
[$LEX_IS_FLEX && test $bison_cv_cxx_works = yes])