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Fix AC_PROG_LEX regression

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Problem reported by Ross Burton in:
https://savannah.gnu.org/support/?110269
* lib/autoconf/programs.m4 (_AC_PROG_LEX_YYTEXT_DECL):
If tests indicate that LEX or LEXLIB does not work, set LEX to ":"
and LEXLIB empty, instead of failing out of 'configure' entirely.
This commit is contained in:
Paul Eggert 2020-07-16 09:46:28 -07:00
parent 6677262915
commit eb4a1d7faf
1 changed files with 9 additions and 4 deletions
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13
lib/autoconf/programs.m4
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@ -740,15 +740,17 @@ main (void)
return ! yylex () + ! yywrap ();
}
]_ACEOF
_AC_DO_VAR(LEX conftest.l)
AC_CACHE_CHECK([for lex output file root], [ac_cv_prog_lex_root], [
ac_cv_prog_lex_root=unknown
_AC_DO_VAR(LEX conftest.l) &&
if test -f lex.yy.c; then
ac_cv_prog_lex_root=lex.yy
elif test -f lexyy.c; then
ac_cv_prog_lex_root=lexyy
else
AC_MSG_ERROR([cannot find output from $LEX; giving up])
fi])
AS_IF([test "$ac_cv_prog_lex_root" = unknown],
[AC_MSG_WARN([cannot find output from $LEX; giving up on $LEX])
LEX=: LEXLIB=])
AC_SUBST([LEX_OUTPUT_ROOT], [$ac_cv_prog_lex_root])dnl
AS_VAR_SET_IF([LEXLIB], [], [
@ -765,13 +767,15 @@ AS_VAR_SET_IF([LEXLIB], [], [
])
AS_IF(
[test "$ac_cv_lib_lex" = 'not found'],
[AC_MSG_ERROR([required lex library not found])],
[AC_MSG_WARN([required lex library not found; giving up on $LEX])
LEX=: LEXLIB=],
[test "$ac_cv_lib_lex" = 'none needed'],
[LEXLIB=''],
[LEXLIB=$ac_cv_lib_lex])
])
AC_SUBST(LEXLIB)
AS_IF([test "$LEX" != :], [
AC_CACHE_CHECK(whether yytext is a pointer, ac_cv_prog_lex_yytext_pointer,
[# POSIX says lex can declare yytext either as a pointer or an array; the
# default is implementation-dependent. Figure out which it is, since
@ -791,6 +795,7 @@ if test $ac_cv_prog_lex_yytext_pointer = yes; then
[Define to 1 if `lex' declares `yytext' as a `char *' by default,
not a `char[]'.])
fi
])
rm -f conftest.l $LEX_OUTPUT_ROOT.c
])# _AC_PROG_LEX_YYTEXT_DECL