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From-SVN: r1116

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+This is a partial list of how `gcc -traditional' disagrees with
+traditional C compilers (perhaps only some of them).  Most of these
+differences are not bugs.
+
+---------------------------------------------------------------------------
+K&R-1 (2.4.3) says:
+
+       "If the character following a backslash is not one of those
+       specified {in the table above}, the backslash is ignored."
+
+Up until recently, `gcc -traditional' complained about \x \a and \v
+appearing in a character or string literal.  I believe however that
+this non-feature has been eliminated (recently).
+
+---------------------------------------------------------------------------
+When in -traditional mode, gcc allows the following erroneous pair of
+declarations to appear together in a given scope:
+
+       typedef int foo;
+       typedef foo foo;
+
+---------------------------------------------------------------------------
+K&R-1 (8.5) says:
+
+       "No field may be wider than a word."
+
+Gcc however allows:
+
+       struct S { int i:33; };
+
+---------------------------------------------------------------------------
+In K&R-1 there is no restriction against comments crossing include file
+boundaries.  Gcc however doesn't allow this, even when in -traditional mode.
+
+---------------------------------------------------------------------------
+Regarding the length of identifiers, K&R-1 (2.2) says:
+
+       "No more than the first eight characters are significant,
+       although more may be used."
+
+Gcc treats all characters of identifiers as significant, even when in
+-traditional mode.
+
+---------------------------------------------------------------------------
+K&R-1 (2.2) says:
+
+       "An identifier is a sequence of letters and digits; the first
+       character must be a letter.  The underscore _ counts as a letter."
+
+Gcc also allows dollar signs in identifiers.  (This may also be an issue
+for the -pedantic option.)
+
+---------------------------------------------------------------------------
+
+