[Bug preprocessor/28521] New: -E output incorrectly concatenates tokens into trigraphs

[Bug preprocessor/28521] New: -E output incorrectly concatenates tokens into trigraphs

[sabre at nondot dot org]

gcc -E on:

#define z ?
?z(

emits:
??(

This won't lex correctly when trigraphs are enabled.

-Chris


-- 
           Summary: -E output incorrectly concatenates tokens into trigraphs
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sabre at nondot dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-07-28 16:23 -------
Hmm, phase 1 (which includes trigraphs) preprocessing happens before phase 2
(macros) so I don't think this is a bug.  And macros cannot produce trigraphs
either.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[sabre at nondot dot org]

------- Comment #2 from sabre at nondot dot org  2006-07-28 16:26 -------
It should print a space for the same reason that this does:

#define x -
-x

-Chris


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[neil at gcc dot gnu dot org]

------- Comment #3 from neil at gcc dot gnu dot org  2006-07-28 23:48 -------
Tokenization is correct since preprocessed output has been through stages 1-3
and starts at stage 4.  If you're passing -trigraphs then your command line is
incorrect.


-- 

neil at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[sabre at nondot dot org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 647 bytes --]



------- Comment #4 from sabre at nondot dot org  2006-07-28 23:59 -------
I realize that tokenization is correct.  As per:
http://gcc.gnu.org/onlinedocs/cppinternals/Token-Spacing.html#Token-Spacing

GCC should be emitting the space so that the subsequent relex of the output
won't lex incorrectly.

-Chris


-- 

sabre at nondot dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2006-07-29 00:05 -------
No it is not a token.  It is a trigraph which is different than a token.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[sabre at nondot dot org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 779 bytes --]



------- Comment #6 from sabre at nondot dot org  2006-07-29 00:08 -------
Andrew, I'm well aware that a trigraph is not a token.  If you read the report,
I say that "gcc -E" produces output that a subsequent GCC will not reparse into
the same result.

Again, this is the whole point of:
http://gcc.gnu.org/onlinedocs/cppinternals/Token-Spacing.html#Token-Spacing

and the reason why GCC doesn't "-E" this:

#define x -
-x

to "--"

-Chris


-- 

sabre at nondot dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[steven at gcc dot gnu dot org]

------- Comment #7 from steven at gcc dot gnu dot org  2006-07-29 00:32 -------
Seems like a bug to me alright.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2006-07-29 00:32:27
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[neil at gcc dot gnu dot org]

------- Comment #8 from neil at gcc dot gnu dot org  2006-07-29 05:02 -------
This is not a bug.  If you are preprocessing preprocessed output, you must use
-fpreprocessed as documented.  Otherwise many other things will go wrong, not
just this.  The bug is on your command line.


-- 

neil at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521

[Bug preprocessor/28521] -E output incorrectly concatenates tokens into trigraphs

[sabre at nondot dot org]

------- Comment #9 from sabre at nondot dot org  2006-07-29 05:03 -------
ok


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28521