[Bug c++/17530] New: 4.0: failure to emit inline function

[Bug c++/17530] New: 4.0: failure to emit inline function

[gcc-bugzilla at gcc dot gnu dot org]

When the source below is compiled, gcc emits a reference to the
inline function `B::staticfunc' but not the definition:

$ ./cc1plus  -quiet x.cc
$ grep staticfunc x.s
        pushl   $_ZN1B10staticfuncEv
$

For this example, this happens only when optimization is off; when
optimization is on, everything gets completely inlined and the problem
disappears.  However, in the original source from which this example
was derived, the problem was observed even with optimization on.

Environment:
System: Linux karma 2.6.8.1 #20 Mon Sep 13 23:48:47 EDT 2004 i686 i686 i386 GNU/Linux
Architecture: i686

	<machine, os, target, libraries (multiple lines)>
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /home/sss/gcc/gcc/configure --prefix=/usr/local/gcc --enable-threads=posix --enable-long-long --enable-languages=c,c++,f95

How-To-Repeat:

Compile the source below:

------------------------------------
typedef void (*Func) ();

struct A
{
  A (Func) {}
};

struct B
{
  static void staticfunc () {}
};

template <class T>
struct C
{
  C() : a (B::staticfunc) {}
  A a;
};

int main ()
{
  C<int> c;
  return 0;
}
------------------------------------
------- Additional Comments From snyder at fnal dot gov  2004-09-17 02:39 -------
Fix:
	<how to correct or work around the problem, if known (multiple lines)>

-- 
           Summary: 4.0: failure to emit inline function
           Product: gcc
           Version: 0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: snyder at fnal dot gov
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17530

[Bug c++/17530] [4.0 Regression] failure to emit inline function

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-09-17 03:26 -------
Confirmed, here is a little smaller testcase which shows what is interacting with what:
typedef void (*Func) ();
void f (Func) {}
struct B
{
  static void staticfunc () {} // <-- moving the function out from the class
};
template <int>  // <-- removing the template fixes it
void C(){ f (B::staticfunc); }
int main ()
{
  C<0>();
  return 0;
}

using Phil's regresion hunter:
between 20040729 and 20040730 is where the problem started which is when Mark's change to move 
to always unit-at-a-time for C++.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mmitchel at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2004-09-17 03:26:56
               date|                            |
            Summary|4.0: failure to emit inline |[4.0 Regression] failure to
                   |function                    |emit inline function
   Target Milestone|---                         |4.0.0
            Version|0.0                         |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17530

[Bug c++/17530] [4.0 Regression] failure to emit inline function

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-09-21 02:29 -------
Working on a fix.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |mark at codesourcery dot com
                   |dot org                     |
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17530

[Bug c++/17530] [4.0 Regression] failure to emit inline function

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-09-21 05:44 -------
Subject: Bug 17530

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	mmitchel@gcc.gnu.org	2004-09-21 05:44:10

Modified files:
	gcc/cp         : ChangeLog pt.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/template: static7.C 

Log message:
	PR c++/17530
	* pt.c (tsubst): Fix parentheses to accomodate emacs.
	(tsubst_baselink): If we get a single function, mark it as used.
	
	PR c++/17530
	* g++.dg/template/static7.C: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.4368&r2=1.4369
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/pt.c.diff?cvsroot=gcc&r1=1.924&r2=1.925
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.4323&r2=1.4324
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/static7.C.diff?cvsroot=gcc&r1=NONE&r2=1.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17530

[Bug c++/17530] [4.0 Regression] failure to emit inline function

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-09-21 05:57 -------
Fixed in GCC 4.0.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17530