[sr #110265] document a problem with AC_EGREP_CPP and AC_EGREP_HEADER

Bruno Haible <[email protected]> Tue, 14 Jul 2020 15:35:13 -0400 (EDT)

Newsgroups	gmane.comp.sysutils.autoconf.bugs
Message-ID	<[email protected]>

URL:
  <https://savannah.gnu.org/support/?110265>

                 Summary: document a problem with AC_EGREP_CPP and
AC_EGREP_HEADER
                 Project: Autoconf
            Submitted by: haible
            Submitted on: Tue 14 Jul 2020 09:35:10 PM CEST
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

Add documentation to AC_EGREP_CPP and AC_EGREP_HEADER, warning about the
problem described in
https://lists.gnu.org/archive/html/bug-autoconf/2017-02/msg00001.html
Namely:

Some uses of AC_EGREP_CPP and AC_EGREP_HEADER probably assume that when no
continuation lines (backslash-newline) and no multiline macro invocations are
involved, each source line produces at most one output line.

This is no longer the case with GCC >= 5.





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