https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Florian Weimer changed:
What|Removed |Added
CC||fw at gcc dot gnu.org
--- Comment #38
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Jakub Jelinek changed:
What|Removed |Added
Status|NEW |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Richard Biener changed:
What|Removed |Added
Target Milestone|5.3 |5.4
--- Comment #36 from Richard
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #34 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #33)
gcc 5.2.1 can no longer reproduce the testcase.
Has the situation changed?
GCC 5 r226650 still fails for me.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #33 from Thiago Macieira thiago at kde dot org ---
gcc 5.2.1 can no longer reproduce the testcase.
Has the situation changed?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #35 from Thiago Macieira thiago at kde dot org ---
I've only tried with SUSE's distro build, as my own GCC build is now GCC 6.
However, I can reproduce it with my GCC 6 build. Let me investigate if OpenSUSE
applied a patch.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Target Milestone|5.2 |5.3
---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Priority|P3 |P2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #27 from Thiago Macieira thiago at kde dot org ---
(In reply to Jakub Jelinek from comment #26)
Plus, if KDE uses so small binaries, why don't just compile them with -fPIC
then?
You can then link them as normal executables or PIEs,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #28 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #27)
(In reply to Jakub Jelinek from comment #26)
Plus, if KDE uses so small binaries, why don't just compile them with -fPIC
then?
You
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #30 from Thiago Macieira thiago at kde dot org ---
(In reply to H.J. Lu from comment #28)
(In reply to Thiago Macieira from comment #27)
(In reply to Jakub Jelinek from comment #26)
Can you guarantee that the linker won't
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #26 from Jakub Jelinek jakub at gcc dot gnu.org ---
Plus, if KDE uses so small binaries, why don't just compile them with -fPIC
then?
You can then link them as normal executables or PIEs, depending on what you
prefer, and still it
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #25 from Jakub Jelinek jakub at gcc dot gnu.org ---
(In reply to Thiago Macieira from comment #23)
$ pmap `pidof qtcreator` | perl -ne '@_ = split / +/; if ($_[6] eq r-xp
$_[7] !~ /\[/) { $_[1] =~ s/K//; $total += $_[1]; $bin =
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #29 from Jakub Jelinek jakub at gcc dot gnu.org ---
(In reply to Thiago Macieira from comment #27)
Still, if this were solved properly, relocations that resolved back into the
executable itself would still be bound locally, even
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #23 from Thiago Macieira thiago at kde dot org ---
$ pmap `pidof qtcreator` | perl -ne '@_ = split / +/; if ($_[6] eq r-xp
$_[7] !~ /\[/) { $_[1] =~ s/K//; $total += $_[1]; $bin = $_[1] unless $bin; }
END { print $bin $total\n; }'
72
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #24 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #23)
$ pmap `pidof qtcreator` | perl -ne '@_ = split / +/; if ($_[6] eq r-xp
$_[7] !~ /\[/) { $_[1] =~ s/K//; $total += $_[1]; $bin = $_[1]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #31 from Thiago Macieira thiago at kde dot org ---
(In reply to Jakub Jelinek from comment #29)
You are missing the point of copy relocations. Consider:
int a = 1;
extern int b, c;
int foo (void)
{
return a + b + c;
}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #22 from H.J. Lu hjl.tools at gmail dot com ---
Created attachment 35427
-- https://gcc.gnu.org/bugzilla/attachment.cgi?id=35427action=edit
A patch to enable -fsymbolic in LTO if -Bsymbolic is used
This patch improves LTO when
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #21 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Jakub Jelinek from comment #19)
I know it isn't the same. But, IMHO this isn't worth adding another knob
which will be a maintainance nightmare.
Performance difference
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Jakub Jelinek jakub at gcc dot gnu.org changed:
What|Removed |Added
CC||jakub at gcc dot
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Keywords||wrong-code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #13 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Jakub Jelinek from comment #12)
First of all, why is this filed as a GCC bug? And what is PIE specific on
the issue? I mean, if -Bsymbolic doesn't cope well with like
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #17 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Jakub Jelinek from comment #16)
(In reply to H.J. Lu from comment #15)
Unless we state -Bsymbolic should never be used with GCC, we should
provide a way to make PIE to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #14 from Jakub Jelinek jakub at gcc dot gnu.org ---
(In reply to H.J. Lu from comment #13)
It is true that the testcase doesn't work with normal executable. I
don't believe GCC is wrong to generate copy relocation in PIE. It
is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #15 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Jakub Jelinek from comment #14)
As it doesn't work with normal executables, I'm not convinced we need such
an option or that it is right to assume it should work.
People
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #16 from Jakub Jelinek jakub at gcc dot gnu.org ---
(In reply to H.J. Lu from comment #15)
Unless we state -Bsymbolic should never be used with GCC, we should
provide a way to make PIE to compatible with -Bsymbolic.
Well, there is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #18 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to H.J. Lu from comment #17)
Since -Bsymbolic is allowed with PIE, we should take advantage of it.
-fsymbolic -fPIE is the same as -fPIC and -fsymbolic -fPIC generates
much
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #19 from Jakub Jelinek jakub at gcc dot gnu.org ---
I know it isn't the same. But, IMHO this isn't worth adding another knob which
will be a maintainance nightmare.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #20 from Thiago Macieira thiago at kde dot org ---
I've just been informed that Clang 3.6 with -fPIE -flto has the same problem,
but I have not been able to reproduce. I find it unexpected that it would do
that in LTO mode but not
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #11 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #8)
(In reply to H.J. Lu from comment #6)
/export/build/gnu/gcc-5/build-x86_64-linux/gcc/xgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #5 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #3)
Thanks H.J.!
Can I ask that -fsymbolic be the default? Otherwise, code with -fPIE MUST
add -fsymbolic in GCC 5+, but can't add it prior
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #6 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to H.J. Lu from comment #5)
BTW, you should add -fsymbolic to -fPIC if the shared library will be
created by -Bsymbolic. It will improve shared library performance.
Here is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #8 from Thiago Macieira thiago at kde dot org ---
(In reply to H.J. Lu from comment #6)
(In reply to H.J. Lu from comment #5)
BTW, you should add -fsymbolic to -fPIC if the shared library will be
created by -Bsymbolic. It will
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #9 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #7)
You're not accounting for loss of performance in the shared libraries that
can't use -Bsymbolic due to the copy relocations, both at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #7 from Thiago Macieira thiago at kde dot org ---
(In reply to H.J. Lu from comment #4)
(In reply to Thiago Macieira from comment #3)
Thanks H.J.!
Can I ask that -fsymbolic be the default? Otherwise, code with -fPIE MUST
add
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #10 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #7)
(In reply to H.J. Lu from comment #4)
(In reply to Thiago Macieira from comment #3)
Thanks H.J.!
Can I ask that -fsymbolic be
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #3 from Thiago Macieira thiago at kde dot org ---
Thanks H.J.!
Can I ask that -fsymbolic be the default? Otherwise, code with -fPIE MUST add
-fsymbolic in GCC 5+, but can't add it prior because the option didn't exist.
Please leave
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65886
--- Comment #4 from H.J. Lu hjl.tools at gmail dot com ---
(In reply to Thiago Macieira from comment #3)
Thanks H.J.!
Can I ask that -fsymbolic be the default? Otherwise, code with -fPIE MUST
add -fsymbolic in GCC 5+, but can't add it prior
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