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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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7
m4/flex.m4
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@@ -15,7 +15,10 @@ AC_DEFUN_ONCE([AC_PROG_LEX],
[AC_CHECK_PROGS([LEX], [flex lex], [:])
if test "x$LEX" != "x:"; then
_AC_PROG_LEX_YYTEXT_DECL
fi])
fi
AC_SUBST([LEX_IS_FLEX],
[`test "$ac_cv_prog_lex_is_flex" = yes && echo true || echo false`])dnl
])
# _AC_PROG_LEX_YYTEXT_DECL
@@ -37,8 +40,6 @@ else
ac_cv_prog_lex_is_flex=no
fi
])
AC_SUBST([LEX_IS_FLEX],
[`test "$ac_cv_prog_lex_is_flex" = yes && echo true || echo false`])dnl
cat >conftest.l <<_ACEOF[
%%