mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-25 07:09:00 +08:00
56 lines
1.9 KiB
Plaintext
56 lines
1.9 KiB
Plaintext
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.)
|
|
|
|
---------------------------------------------------------------------------
|
|
|
|
|