[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

commit 9101c36c653cf90ccd133d6e85eca6b264de4b81
Author: David Kalnischkies 
Date:   Fri Aug 12 19:11:01 2016 +0200

drop "incorrect" const attribute from DirectoryExists

Since its existence in 2010 DirectoryExists was always marked with this
attribute, but for no real reason. Arguably a check for the existence of
the file is not modifying global state, so theoretically this shouldn't
be a problem. It is wrong from a logical point of view through as
between two calls the directory could be created so the promise we made
to the compiler that it could remove the second call would be wrong, so
API wise it is wrong.

The problem for the compiler is a lot more likely through in the
underlying implementation of stat() and co, so for both reasons lets
drop this attribute here and be (hopefully) done with it forever.

It's a bit mysterious that this is only observeable on ppc64el and can be
fixed by reordering code ever so slightly, but in the end its more our
fault for adding this attribute than the compilers fault for doing
something silly based on the attribute.

LP: 1473674

diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index 4a1676d..15665f8 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -164,7 +164,7 @@ bool RemoveFile(char const * const Function, std::string 
const );
 int GetLock(std::string File,bool Errors = true);
 bool FileExists(std::string File);
 bool RealFileExists(std::string File);
-bool DirectoryExists(std::string const ) APT_CONST;
+bool DirectoryExists(std::string const );
 bool CreateDirectory(std::string const , std::string const );
 time_t GetModificationTime(std::string const );
 bool Rename(std::string From, std::string To);

** Changed in: gcc-6 (Ubuntu)
   Status: New => Invalid

** Changed in: gcc-5 (Ubuntu)
   Status: New => Invalid

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Fix Released
Status in gcc-5 package in Ubuntu:
  Invalid
Status in gcc-6 package in Ubuntu:
  Invalid
Status in apt source package in Wily:
  Confirmed

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: ""
  Expected: path + "/.disk/"
  Which is: "/tmp/apt-tests-findpackage.gpopMw/.disk/"
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Launchpad Bug Tracker]

This bug was fixed in the package apt - 1.3~rc1ubuntu2

---
apt (1.3~rc1ubuntu2) yakkety; urgency=medium

  * Don't build with -O3. See LP: #1473674.

 -- Matthias Klose   Fri, 12 Aug 2016 09:44:56 +0200

** Changed in: apt (Ubuntu)
   Status: Confirmed => Fix Released

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Fix Released
Status in gcc-5 package in Ubuntu:
  New
Status in gcc-6 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: ""
  Expected: path + "/.disk/"
  Which is: "/tmp/apt-tests-findpackage.gpopMw/.disk/"
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

seen again  with https://launchpad.net/ubuntu/+source/apt/1.3~rc1ubuntu1
work around with https://launchpad.net/ubuntu/+source/apt/1.3~rc1ubuntu2


** No longer affects: gcc-6 (Ubuntu Wily)

** No longer affects: gcc-5 (Ubuntu Wily)

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in gcc-6 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: ""
  Expected: path + "/.disk/"
  Which is: "/tmp/apt-tests-findpackage.gpopMw/.disk/"
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

** Also affects: gcc-6 (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in gcc-6 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New
Status in gcc-6 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: ""
  Expected: path + "/.disk/"
  Which is: "/tmp/apt-tests-findpackage.gpopMw/.disk/"
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Julian Andres Klode]

DonKult added another workaround for this, which is now in 1.1.2:

http://anonscm.debian.org/cgit/apt/apt.git/commit/?id=0300f0077af832e87beb290f26b13404cab81fd3

-- 
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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: ""
  Expected: path + "/.disk/"
  Which is: "/tmp/apt-tests-findpackage.gpopMw/.disk/"
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[William J. Schmidt]

Spent some time trying to reproduce this upstream.  From the information
given, I am unable to do so.

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[William J. Schmidt]

As a guess, is FindPackages being inlined?  If so, and if the parameter
passed in as InfoDir isn't subsequently used, the compiler would be
within its rights to remove the assignment to InfoDir.  May want to
check callers of FindPackages for this possibility.

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Michael Vogt]

I looked into this and the issue is the following:

There is a Cdrom wrapper:

class Cdrom : public pkgCdrom {
   public:
  bool FindPackages(std::string const CD,
std::vectorstd::string List,
std::vectorstd::string SList,
std::vectorstd::string SigList,
std::vectorstd::string TransList,
std::string InfoDir) {
 std::string const startdir = SafeGetCWD();
 EXPECT_FALSE(startdir.empty());
 bool const result = pkgCdrom::FindPackages(CD, List, SList, SigList, 
TransList, InfoDir, NULL, 0);
...
}


and a unittest that calls it:

TEST(CDROMTest,FindPackages)
{
   Cdrom cd;
  std::string InfoDir; 
  EXPECT_TRUE(cd.FindPackages(path, Packages, Sources, Signatur, Translation, 
InfoDir));
...
  EXPECT_EQ(path + /.disk/, InfoDir);
}


The actual code for this is apt-pkg/cdrom.cc:

bool pkgCdrom::FindPackages(string CD,
vectorstring List,
vectorstring SList, 
vectorstring SigList,
vectorstring TransList,
string InfoDir, pkgCdromStatus *log,
unsigned int Depth)
{
...
   if (DirectoryExists(.disk) == true)
   {
  if (InfoDir.empty() == true)
 InfoDir = CD + .disk/;
   }
...


So I suspect that the optimizer gets confused that InfoDir is a
reference or it gets confused because InfoDir is not used in
FindPackages anymore and it assumes its dead code.

I tried to create a simplified testcase but failed so far. Whats interessting 
is that if I add a std::cerr  debug line into cdrom.cc lines (or even a CD 
= CD):

   if (DirectoryExists(.disk) == true)
   {
  if (InfoDir.empty() == true) {
std::cerr  debug  std::endl;
 InfoDir = CD + .disk/;
}
   }

it works (which indicates dead-code elimination to me).

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

just building apt-pkg/cdrom.cc with -O2 works

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

** Bug watch added: GCC Bugzilla #66868
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66868

** Also affects: gcc via
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66868
   Importance: Unknown
   Status: Unknown

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in gcc:
  Unknown
Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

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[Touch-packages] [Bug 1473674] Re: apt fails a test from the testsuite on ppc64el when built with gcc-5 and -O3

[Matthias Klose]

the test fails too on amd64 with -O3

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Title:
  apt fails a test from the testsuite on ppc64el when built with gcc-5
  and -O3

Status in apt package in Ubuntu:
  Confirmed
Status in gcc-5 package in Ubuntu:
  New
Status in apt source package in Wily:
  Confirmed
Status in gcc-5 source package in Wily:
  New

Bug description:
  to reproduce:

   - wily chroot
   - PPA 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-016/
 (this holds gcc-5 as the default, branch 20150711).
   - dpkg-buildpackage -B 

  note that explicitly using the gcc-5/g++-5 from wily doesn't show the
  test failure. the only difference in the configuration is that the one
  in wily is built using the old libstdc++ ABI and the one in the PPA
  with the dual ABI defaulting to new/c++11.

  building with -O2 instead of -O3 works around the issue.

  [ RUN  ] CDROMTest.FindPackages
  
/scratch/doko/tmp/apt-1.0.9.10ubuntu1/test/libapt/cdromfindpackages_test.cc:95: 
Failure
  Value of: InfoDir
Actual: 
  Expected: path + /.disk/
  Which is: /tmp/apt-tests-findpackage.gpopMw/.disk/
  [  FAILED  ] CDROMTest.FindPackages (4 ms)

To manage notifications about this bug go to:
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