[Bug c/20303] New: Can't push more than 16 nested visibility

[Bug c/20303] New: Can't push more than 16 nested visibility

[hjl at lucon dot org]

When

#pragma GCC visibility push(default)
#pragma GCC visibility pop

are used for header file wrappers, we may have more 16

#pragma GCC visibility push(default)

Currently gcc will fail.

-- 
           Summary: Can't push more than 16 nested visibility
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-03-03 18:43 -------
This is a documented behavior.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-03-03 18:47 -------
It makes it less useful for header file wrappers. Supporting the case of N (N>16)

#pragma GCC visibility push(default)

followed by N

#pragma GCC visibility pop

shouldn't be very hard.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-03-03 19:19 -------
A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2005-03/msg00238.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[joseph at codesourcery dot com]

------- Additional Comments From joseph at codesourcery dot com  2005-03-03 22:58 -------
Subject: Re:  Can't push more than 16 nested visibility

On Thu, 3 Mar 2005, pinskia at gcc dot gnu dot org wrote:

> This is a documented behavior.

Arbitrary limits are still generally undesirable, even when documented.

Some limits are very unlikely to be reached by real programs, even 
computer-generated ones, and genuinely motivated by efficiency.  For 
example, the C front end only supports 268435455 (= 2^28 - 1) nested 
scopes.  If there were a real use for more scopes, or for a very few 
programs to exceed other such limits motivated by efficiency concerns, we 
could add a --enable-huge-programs configure option to increase those 
limits at some performance cost to almost all normal programs.  Another 
limit in a similar situation is the limit of USHRT_MAX parameters to a 
preprocessor macro.

In this case, the limit is reached by real code and I very much doubt 
(without profiling information to show to the contrary) that there would 
be any measurable performance difference with using VEC, so we should just 
do that and get rid of the limit.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2005-03-03 23:00 -------
(In reply to comment #4)

I strongly agree with everything in JSM's post. There is simply no reason for 
keeping such a stupid limit, and even less for manually optimizing conditions 
to enhance the limit. Using a VEC is more than enough for this case.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-03-03 23:00:45
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-04-05 18:36 -------
A new patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2005-04/msg00567.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-05-30 18:49 -------
Subject: Bug 20303

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	hjl@gcc.gnu.org	2005-05-30 18:49:04

Modified files:
	gcc            : ChangeLog c-pragma.c 
	gcc/doc        : invoke.texi 

Log message:
	2005-05-30  H.J. Lu  <hongjiu.lu@intel.com>
	
	PR middle-end/20303
	* c-pragma.c: Include "vec.h".
	(handle_pragma_visibility): Use VEC.
	
	* doc/invoke.texi: Remove the nested visibility push limit.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8947&r2=2.8948
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-pragma.c.diff?cvsroot=gcc&r1=1.85&r2=1.86
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/doc/invoke.texi.diff?cvsroot=gcc&r1=1.626&r2=1.627



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-05-30 18:51 -------
Fixed on mainline.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-05-30 18:52 -------
Fixed on mainline.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] Can't push more than 16 nested visibility

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2005-07-14 15:33 -------
Any reason why this hasn't been fixed on gcc-4_0-branch as well?

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] [4.0 only] Can't push more than 16 nested visibility

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-07-14 17:25 -------
A patch for gcc 4.0 is posted at

http://gcc.gnu.org/ml/gcc-patches/2005-07/msg00994.html

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |
            Summary|Can't push more than 16     |[4.0 only] Can't push more
                   |nested visibility           |than 16 nested visibility


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] [4.0 only] Can't push more than 16 nested visibility

[hjl at lucon dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.0                       |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] [4.0 only] Can't push more than 16 nested visibility

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] [4.0 only] Can't push more than 16 nested visibility

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-07-25 07:39 -------
Subject: Bug 20303

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jakub@gcc.gnu.org	2005-07-25 07:38:58

Modified files:
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.dg: visibility-d.c 

Log message:
	PR middle-end/20303
	* gcc.dg/visibility-d.c: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5812&r2=1.5813
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/visibility-d.c.diff?cvsroot=gcc&r1=NONE&r2=1.1



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303

[Bug c/20303] [4.0 only] Can't push more than 16 nested visibility

[mmitchel at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.2                       |4.0.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20303