autoconf: AC_SYS_LARGEFILE documentation misleading

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found 158969 2.69-10
thanks

Hi *,

I have to reopen this because the documentation is plain wrong
and misleading still:

 -- Macro: AC_SYS_LARGEFILE
     Arrange for 64-bit file offsets, known as large-file support
     (http://www.unix-systems.org/version2/whatsnew/lfs20mar.html).  On
     some hosts, one must use special compiler options to build programs
     that can access large files.  Append any such options to the output
     variable 'CC'.  Define '_FILE_OFFSET_BITS' and '_LARGE_FILES' if
     necessary.

ii  autoconf              2.69-10         all             automatic configure script builder
ii  autoconf-doc          2.69-10         all             automatic configure script builder documentatio

Looking at the source, AC_SYS_LARGEFILE calls AC_DEFINE_UNQUOTED,
which appends to DEFS (which I agree with Tom Dickey is wrong) as
Florian Weimer said, but — even more confusingly — only when
AC_CONFIG_HEADERS is not used.

If AC_CONFIG_HEADERS is used, the definition is only written to
its output file (config.h by default).

This is even more unfortunate, because now, if any program includes
a glibc system header before "config.h", the definition will be
ignored, because it comes too late.

CPPFLAGS is r̲e̲a̲l̲l̲y̲ the correct place for this. Again.

But that’s a different bug. This issue is about the documentation
being wrong — please fix the documentation and raise this bug upstream
(and this time, don’t let them tell you it’s not a bug because it most
curtainly is).

Thanks,
//mirabilos (current hat: Debian Developer)
-- 
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