[Bug bootstrap/32815] New: crtstuff.c,warning, will always evaluate as 'true'

[Bug bootstrap/32815] New: crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

../../src/gcc/crtstuff.c: In function '__do_global_dtors_aux':
../../src/gcc/crtstuff.c:298: warning: the address of '__deregister_frame_info'
will always evaluate as 'true'
../../src/gcc/crtstuff.c: In function 'frame_dummy':
../../src/gcc/crtstuff.c:332: warning: the address of '__register_frame_info'
will always evaluate as 'true'
/home/beans/gcc-build/build/./gcc/xgcc -B/home/beans/gcc-build/build/./gcc/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/bin/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/lib/ -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/include -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/sys-include -O2 -O2 -g -O2  -DIN_GCC   
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -I. -I. -I../../src/gcc
-I../../src/gcc/. -I../../src/gcc/../include -I../../src/gcc/../libcpp/include 
-I../../src/gcc/../libdecnumber -I../libdecnumber  -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-toplevel-reorder   \
          -c ../../src/gcc/crtstuff.c -DCRT_END \
          -o crtend.o
/home/beans/gcc-build/build/./gcc/xgcc -B/home/beans/gcc-build/build/./gcc/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/bin/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/lib/ -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/include -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/sys-include -O2 -O2 -g -O2  -DIN_GCC   
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -I. -I. -I../../src/gcc
-I../../src/gcc/. -I../../src/gcc/../include -I../../src/gcc/../libcpp/include 
-I../../src/gcc/../libdecnumber -I../libdecnumber  -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-toplevel-reorder   \
          -c ../../src/gcc/crtstuff.c -DCRT_BEGIN -DCRTSTUFFS_O \
          -o crtbeginS.o
../../src/gcc/crtstuff.c: In function '__do_global_dtors_aux':
../../src/gcc/crtstuff.c:276: warning: the address of '__cxa_finalize' will
always evaluate as 'true'
../../src/gcc/crtstuff.c:298: warning: the address of '__deregister_frame_info'
will always evaluate as 'true'
../../src/gcc/crtstuff.c: In function 'frame_dummy':
../../src/gcc/crtstuff.c:332: warning: the address of '__register_frame_info'
will always evaluate as 'true'
/home/beans/gcc-build/build/./gcc/xgcc -B/home/beans/gcc-build/build/./gcc/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/bin/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/lib/ -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/include -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/sys-include -O2 -O2 -g -O2  -DIN_GCC   
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -I. -I. -I../../src/gcc
-I../../src/gcc/. -I../../src/gcc/../include -I../../src/gcc/../libcpp/include 
-I../../src/gcc/../libdecnumber -I../libdecnumber  -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-toplevel-reorder   \
          -c ../../src/gcc/crtstuff.c -DCRT_END -DCRTSTUFFS_O \
          -o crtendS.o
/home/beans/gcc-build/build/./gcc/xgcc -B/home/beans/gcc-build/build/./gcc/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/bin/
-B/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/lib/ -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/include -isystem
/opt/gcc-4.1.2/lp64/hppa64-hp-hpux11.11/sys-include -O2 -O2 -g -O2  -DIN_GCC   
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -I. -I. -I../../src/gcc
-I../../src/gcc/. -I../../src/gcc/../include -I../../src/gcc/../libcpp/include 
-I../../src/gcc/../libdecnumber -I../libdecnumber  -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-toplevel-reorder   \
          -c ../../src/gcc/crtstuff.c -DCRT_BEGIN -DCRTSTUFFT_O \
          -o crtbeginT.o
../../src/gcc/crtstuff.c: In function '__do_global_dtors_aux':
../../src/gcc/crtstuff.c:298: warning: the address of '__deregister_frame_info'
will always evaluate as 'true'
../../src/gcc/crtstuff.c: In function 'frame_dummy':
../../src/gcc/crtstuff.c:332: warning: the address of '__register_frame_info'
will always evaluate as 'true'


-- 
           Summary: crtstuff.c,warning, will always evaluate as 'true'
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cnstar9988 at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

------- Comment #1 from cnstar9988 at gmail dot com  2007-07-19 03:01 -------
boot gcc, 3.4.6


-- 

cnstar9988 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  GCC build triplet|                            |hppa64-hp-hpux11.11
   GCC host triplet|                            |hppa64-hp-hpux11.11
 GCC target triplet|                            |hppa64-hp-hpux11.11
      Known to fail|                            |4.2.1
      Known to work|                            |3.4.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

-- 

cnstar9988 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

------- Comment #2 from cnstar9988 at gmail dot com  2007-07-19 03:12 -------
I think $(GCC)/Makefile.in must remove -O2 for build.
Because the boot GCC may have some bugs with -O2.
It's known that -O2 contain "-fstrict-aliasing" which has bugs since gcc 3.X.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2007-07-19 06:59 -------
> It's known that -O2 contain "-fstrict-aliasing" which has bugs since gcc 3.X.
Huh?????


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

------- Comment #4 from cnstar9988 at gmail dot com  2007-07-19 07:03 -------
When I build gcc-4.2.1(prelease) on HPUX11.11, there is some warning..

why the share library build by GCC4.X on HPUX11.11 can't work..
some symbol required by the shared library could not be found.

But these works on by GCC3.4.6 or native hpcc.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[cnstar9988 at gmail dot com]

------- Comment #5 from cnstar9988 at gmail dot com  2007-07-19 07:05 -------
(In reply to comment #3)
> > It's known that -O2 contain "-fstrict-aliasing" which has bugs since gcc 3.X.
> Huh?????

from 4.2.1 status report.
PR 32182 -fstrict-aliasing ...
PR 32327 Incorrect stack sharing...
PR 32328 -fstrict-aliasing ...

...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815

[Bug bootstrap/32815] crtstuff.c,warning, will always evaluate as 'true'

[danglin at gcc dot gnu dot org]

------- Comment #6 from danglin at gcc dot gnu dot org  2007-10-29 01:41 -------
The warnings are expected.  From pa64-hpux.h:

/* We don't want undefined weak references to __register_frame_info,
   __deregister_frame_info, _Jv_RegisterClasses and __cxa_finalize
   introduced by crtbegin.o.  The GNU linker only resolves weak
   references if they appear in a shared library.  Thus, it would be
   impossible to create a static executable if the symbols were weak.
   So, the best solution seems to be to make the symbols strong and
   provide an archive library of empty stub functions.  */
#define TARGET_ATTRIBUTE_WEAK

The other part of the story that is missing from the above is that
the HP dynamic linker doesn't support undefined weak symbols.  So,
the symbols are strong and there default implementations in a stub
archive library.  That's the origin of the warnings.

The warning could be avoided with a hppa64 specific implementation
of crtstuff.c, but the code wouldn't do anything different than it
does now.  The if's that cause the warnings are optimized away.

gcc-3.4.6 doesn't have the TARGET_ATTRIBUTE_WEAK define.  That's
the relevant difference.


-- 

danglin at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |danglin at gcc dot gnu dot
                   |                            |org
           Severity|normal                      |enhancement
           Priority|P3                          |P5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32815