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AC_PROG_LEX no longer sets LEXLIB for yywrap

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Suggested by Zack Weinberg in:
https://lists.gnu.org/r/autoconf-patches/2020-07/msg00016.html
* lib/autoconf/programs.m4 (_AC_PROG_LEX_YYTEXT_DECL):
Define yywrap too.
This commit is contained in:
Paul Eggert 2020-07-16 10:39:56 -07:00
parent eb4a1d7faf
commit 29ede6b96f
3 changed files with 18 additions and 4 deletions
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4
NEWS
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@ -104,6 +104,10 @@ GNU Autoconf NEWS - User visible changes.
- AC_PROG_CC_STDC, AC_PROG_CC_C89, AC_PROG_CC_C99 have been marked as obsolete. - AC_PROG_CC_STDC, AC_PROG_CC_C89, AC_PROG_CC_C99 have been marked as obsolete.
Applications should use AC_PROG_CC. Applications should use AC_PROG_CC.
- AC_PROG_LEX no longer sets LEXLIB to be nonempty merely to define
the yywrap function. Packages should define yywrap themselves, or
use %noyywrap.
- AC_USE_SYSTEM_EXTENSIONS now enables more extensions on HP-UX, - AC_USE_SYSTEM_EXTENSIONS now enables more extensions on HP-UX,
macOS, and MINIX, as well as on systems conforming to recent macOS, and MINIX, as well as on systems conforming to recent
ISO/IEC C technical reports and specifications. ISO/IEC C technical reports and specifications.

13
doc/autoconf.texi
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@ -4177,15 +4177,20 @@ The result of the test can be overridden by setting the variable
@cvindex YYTEXT_POINTER @cvindex YYTEXT_POINTER
@ovindex LEX_OUTPUT_ROOT @ovindex LEX_OUTPUT_ROOT
@caindex prog_LEX @caindex prog_LEX
If @code{flex} is found, set output variable @code{LEX} to @samp{flex} If @code{flex} is found, set output variable @code{LEX} to @samp{flex}.
and @code{LEXLIB} to @option{-lfl}, if that library is in a standard Otherwise set @code{LEX} to @samp{lex}, if found.
place. Otherwise set @code{LEX} to @samp{lex} and @code{LEXLIB} to If neither variant is available, set @code{LEX}
@option{-ll}, if found. If neither variant is available, set @code{LEX}
to @samp{:}; for packages that ship the generated @file{file.yy.c} to @samp{:}; for packages that ship the generated @file{file.yy.c}
alongside the source @file{file.l}, this default allows users without a alongside the source @file{file.l}, this default allows users without a
lexer generator to still build the package even if the timestamp for lexer generator to still build the package even if the timestamp for
@file{file.l} is inadvertently changed. @file{file.l} is inadvertently changed.
If generated lexers need a library to work, set output variable
@code{LEXLIB} to an option for that library (e.g., @option{-ll});
otherwise define @code{LEXLIB} to empty. A library that merely defines
@code{main} and @code{yywrap} placeholder functions is not considered
to be needed.
Define @code{YYTEXT_POINTER} if @code{yytext} defaults to @samp{char *} instead Define @code{YYTEXT_POINTER} if @code{yytext} defaults to @samp{char *} instead
of to @samp{char []}. Also set output variable @code{LEX_OUTPUT_ROOT} to of to @samp{char []}. Also set output variable @code{LEX_OUTPUT_ROOT} to
the base of the file name that the lexer generates; usually the base of the file name that the lexer generates; usually

5
lib/autoconf/programs.m4
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@ -735,6 +735,11 @@ f { unput (yytext[0]); }
extern char *yytext; extern char *yytext;
#endif #endif
int int
yywrap (void)
{
return 1;
}
int
main (void) main (void)
{ {
return ! yylex () + ! yywrap (); return ! yylex () + ! yywrap ();