freebsd-src/contrib/gcc/README.TRAD
Peter Wemm a4cd5630b0 Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
1996-09-18 05:35:50 +00:00

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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.
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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).
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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;
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K&R-1 (8.5) says:
"No field may be wider than a word."
Gcc however allows:
struct S { int i:33; };
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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.
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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.
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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.)
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