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

[Bruno Haible]

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

    _______________________________________________________

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.





    _______________________________________________________

Reply to this item at:

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

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/