[Bug 2029924] Re: [SRU] "Can't locate lcovutil.pm" after updating to 2.0-1

[Julian Andres Klode]

You have manually overriden the pin for lcov in proposed to 400 using a
package-specific pin in /etc/apt/preferences so that takes precedence
over the -t option (which is pinning the Packages line to 990).

Not sure why you do this but in any case you can install by specifying
lcov/mantic-proposed instead of using -t or dropping the package
specific pin.

Not sure why you bother with any of that though, as has been verified in
multiple comments, the fix in the proposed version is incomplete and
more work is needed.

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Title:
  [SRU] "Can't locate lcovutil.pm" after updating to 2.0-1

Status in lcov package in Ubuntu:
  Fix Released
Status in lcov source package in Mantic:
  Confirmed
Status in lcov package in Debian:
  Fix Released

Bug description:
  [ Impact ]

  lcov is completely unusable as it will always give the following error
  when lcov is executed.

  $ lcov --help
  Can't locate lcovutil.pm in @INC (you may need to install the lcovutil module) (@INC contains: /usr/local/lib/lcov /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.36.0 /usr/local/share/perl/5.36.0 /usr/lib/x86_64-linux-gnu/perl5/5.36 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl-base /usr/lib/x86_64-linux-gnu/perl/5.36 /usr/share/perl/5.36 /usr/local/lib/site_perl) at /usr/bin/lcov line 102.
  BEGIN failed--compilation aborted at /usr/bin/lcov line 102.

  Update:
  The error with lcov --help has been fixed in -proposed but it was noticed in the verification that lcov is still unusable and can not generate report. And the errors seen are same as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1043009#10.

  
  [ Test Plan ]

   * install lcov
   * execute "lcov --help"

  A more detailed test plan to test the functionality:

  1. Use the attached test.c file
  2. cc test.c -fprofile-arcs -ftest-coverage -lgcov
  3. ./a.out
  4. lcov --base-directory . --directory . --capture --output-file i3.info
  5. genhtml -o /tmp/i3-coverage/ i3.info

  
  [ Where problems could occur ]

   * There is no change in the code, it only installs a file which lcov
  expects at runtime. So, user should not see any change in the known
  behaviour.

   * For the incremental diff, its removing two patches for old gcc
  which Debian has already removed. These patches were modifying geninfo
  to add support for old gcc. But since gcc-13 will be installed by
  default in Mantic so these patches were creating new problems.

  Since it is possible to install gcc-9 in Mantic, so lcov will be not
  work in that case. But I have verified that none of the "lcov" package
  in mantic or mantic-proposed works with gcc-9 currently. So removing
  these old patches will not introduce any new regression.

  
  [ Other Info ]

   * There are few more changes apart from installing "lcovutil.pm".
   * Multi threading had to be disabled in the build, otherwise the tests during the build are failing. Debian has disabled the tests for this but it is better to keep the tests enabled. I have also sent the chane to Debian - https://salsa.debian.org/mckinstry/lcov/-/merge_requests/2
   * lcov also needs libcapture-tiny-perl and libdatetime-perl at run time. This has been done in Debian - https://salsa.debian.org/mckinstry/lcov/-/commit/1427b494b40c4e8e23055bd33b0625d341898456

  Update:
  * Debian has removed the old gcc compatibility patches at https://salsa.debian.org/mckinstry/lcov/-/commit/3c952e83b08652ec4233de0b07a1c8b55109831e. 

  [ Original Bug Description ]

  The new lcov version is broken.

  $ lcov
  Can't locate lcovutil.pm in @INC (you may need to install the lcovutil module) (@INC contains: /usr/local/lib/lcov /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.36.0 /usr/local/share/perl/5.36.0 /usr/lib/x86_64-linux-gnu/perl5/5.36 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl-base /usr/lib/x86_64-linux-gnu/perl/5.36 /usr/share/perl/5.36 /usr/local/lib/site_perl) at /usr/bin/lcov line 102.
  BEGIN failed--compilation aborted at /usr/bin/lcov line 102.

  Reported upstream https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=1043009

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