Re: autoconf-2.68: no AC_LANG_SOURCE call detected in body

[Křištof Želechovski]

Dnia wtorek, 14 czerwca 2011 o 15:45:18 Eric Blake napisał(a):
> Indeed.  Here's what I'm pushing:

ChangeLog mentions updating THANKS but the diff for THANKS is empty.  is that 
correct?

> 
> diff --git i/ChangeLog w/ChangeLog
> index 1fca7bb..03541e0 100644
> --- i/ChangeLog
> +++ w/ChangeLog
> @@ -1,3 +1,10 @@
> +2011-06-14  Eric Blake  <address@hidden>
> +
> +     doc: update quoting example
> +     * doc/autoconf.texi (Autoconf Language): Add AC_LANG_SOURCE use.
> +     * THANKS: Update.
> +     Reported by Křištof Želechovski.
> +
>  2011-05-05  Eric Blake  <address@hidden>
> 
>       doc: document dash bug with positional parameters
> diff --git i/THANKS w/THANKS
> index 7679b05..e125ebe 100644
> --- i/THANKS
> +++ w/THANKS
> diff --git i/doc/autoconf.texi w/doc/autoconf.texi
> index 7ff693f..99b1fd1 100644
> --- i/doc/autoconf.texi
> +++ w/doc/autoconf.texi
> @@ -1288,19 +1288,26 @@ Autoconf Language
>  i.e., expect one level of quotes to be lost.  For instance:
> 
>  @example
> -AC_COMPILE_IFELSE([char b[10];], [], [AC_MSG_ERROR([you lose])])
> +AC_COMPILE_IFELSE(AC_LANG_SOURCE([char b[10];]), [],
> + [AC_MSG_ERROR([you lose])])
>  @end example
> 
>  @noindent
> -is incorrect: here, the first argument of @code{AC_COMPILE_IFELSE} is
> +is incorrect: here, the first argument of @code{AC_LANG_SOURCE} is
>  @samp{char b[10];} and is expanded once, which results in
> address@hidden b10;}.  (There was an idiom common in Autoconf's past to
> address@hidden b10;}; and the @code{AC_LANG_SOURCE} is also expanded prior
> +to being passed to @code{AC_COMPILE_IFELSE}.  (There was an idiom common
> +in Autoconf's past to
>  address this issue via the M4 @code{changequote} primitive, but do not
>  use it!)  Let's take a closer look: the author meant the first argument
> -to be understood as a literal, and therefore it must be quoted twice:
> +to be understood as a literal, and therefore it must be quoted twice;
> +likewise, the intermediate @code{AC_LANG_SOURCE} macro should be quoted
> +once so that it is only expanded after the rest of the body of
> address@hidden is in place:
> 
>  @example
> -AC_COMPILE_IFELSE([[char b[10];]], [], [AC_MSG_ERROR([you lose])])
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char b[10];]])], [],
> +  [AC_MSG_ERROR([you lose])])
>  @end example
> 
>  @noindent
> 
>