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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