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[PATCH] docs/install.texi: Add note about not relying on gawk extensions


OK for trunk?  ("make info" and "make dvi" seem to work, though I don't
have a dvi viewer handy).
commit fb34f52e9f9f1dcce416cb45dab23ec10625ad16
Author: David Malcolm <dmalcolm@redhat.com>
Date:   Thu Jul 25 12:07:26 2013 -0400

    gcc/
    	* doc/install.texi (A POSIX or SVR4 awk): Add note about not
    	relying on gawk extensions.

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index e05cbed..96e779c 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -286,6 +286,9 @@ Necessary for creating some of the generated source files for GCC@.
 If in doubt, use a recent GNU awk version, as some of the older ones
 are broken.  GNU awk version 3.1.5 is known to work.
 
+Note that awk scripts should not make use of gawk extensions.  You can
+disable these in gawk using the @option{-c} option.
+
 @item GNU binutils
 
 Necessary in some circumstances, optional in others.  See the

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