Bug#984168: haskell-bz2: ftbfs with GCC-11

[Matthias Klose]

Package: src:haskell-bz2
Version: 1.0.0.1-2
Severity: normal
Tags: sid bookworm
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-11

[This bug is not targeted to the upcoming bullseye release]

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-11/g++-11, but succeeds to build with gcc-10/g++-10. The
severity of this report will be raised before the bookworm release,
so nothing has to be done for the bullseye release.

The full build log can be found at:
http://people.debian.org/~doko/logs/20210228/filtered/gcc11/haskell-bz2_1.0.0.1-2_unstable_gcc11.log
The last lines of the build log are at the end of this report.

To build with GCC 11, either set CC=gcc-11 CXX=g++-11 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures are new warnings resulting in build failures with
-Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-11/porting_to.html

GCC 11 defaults to the GNU++17 standard.  If your package installs
header files in /usr/include, please don't work around C++17 issues
by choosing a lower C++ standard for the package build, but fix these
issues to build with the C++17 standard.

[...]
        include deepseq-1.4.4.0
        include directory-1.3.6.0
        include filepath-1.4.2.1
        include tasty-1.2.3-AZt8xI2xlno8v5hDADqrNN
        include tasty-golden-2.3.3.2-6sJb7oXGG78cNUBuhO2MY
        include tasty-hunit-0.10.0.2-BqZUGn5O6hLEnVSlkj273H
Ready component graph:
    definite bz2-1.0.0.1-6nxzksin47k5tsH0wSuJKl
        depends base-4.13.0.0
        depends bytestring-0.10.10.1
    definite bz2-1.0.0.1-1kvSrlJqb0iAhQ9t5u3rGW-bz2-test
        depends base-4.13.0.0
        depends bytestring-0.10.10.1
        depends bz2-1.0.0.1-6nxzksin47k5tsH0wSuJKl
        depends deepseq-1.4.4.0
        depends directory-1.3.6.0
        depends filepath-1.4.2.1
        depends tasty-1.2.3-AZt8xI2xlno8v5hDADqrNN
        depends tasty-golden-2.3.3.2-6sJb7oXGG78cNUBuhO2MY
        depends tasty-hunit-0.10.0.2-BqZUGn5O6hLEnVSlkj273H
Using Cabal-3.0.1.0 compiled by ghc-8.8
Using compiler: ghc-8.8.4
Using install prefix: /usr
Executables installed in: /usr/bin
Libraries installed in:
/usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.8.4/bz2-1.0.0.1-6nxzksin47k5tsH0wSuJKl
Dynamic Libraries installed in:
/usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.8.4
Private executables installed in: /usr/lib/x86_64-linux-ghc-8.8.4/bz2-1.0.0.1
Data files installed in: /usr/share/bz2
Documentation installed in: /usr/share/doc/x86_64-linux-ghc-8.8.4/bz2-1.0.0.1
Configuration files installed in: /usr/etc
No alex found
Using ar found on system at: /usr/bin/x86_64-linux-gnu-ar
Using c2hs version 0.28.6 found on system at: /usr/bin/c2hs
No cpphs found
No doctest found
Using gcc version 11 found on system at: /usr/bin/x86_64-linux-gnu-gcc
Using ghc version 8.8.4 found on system at: /usr/bin/ghc
Using ghc-pkg version 8.8.4 found on system at: /usr/bin/ghc-pkg
No ghcjs found
No ghcjs-pkg found
No greencard found
Using haddock version 2.23.0 found on system at: /usr/bin/haddock
No happy found
Using haskell-suite found on system at: haskell-suite-dummy-location
Using haskell-suite-pkg found on system at: haskell-suite-pkg-dummy-location
No hmake found
Using hpc version 0.67 found on system at: /usr/bin/hpc
Using hsc2hs version 0.68.7 found on system at: /usr/bin/hsc2hs
No hscolour found
No jhc found
Using ld found on system at: /usr/bin/x86_64-linux-gnu-ld.gold
No pkg-config found
Using runghc version 8.8.4 found on system at: /usr/bin/runghc
Using strip version 2.35 found on system at: /usr/bin/strip
Using tar found on system at: /bin/tar
No uhc found
touch configure-ghc-stamp
. /usr/share/haskell-devscripts/Dh_Haskell.sh && \
build_recipe
Running debian/hlibrary.setup build --builddir=dist-ghc
Preprocessing library for bz2-1.0.0.1..
c2hs: C header contains errors:

dist-ghc/build/Codec/Compression/BZip/Foreign/Common.i:1: (column 1) [ERROR]  >>> Lexical error !
  The character '#' does not fit here.

make: *** [/usr/share/cdbs/1/class/hlibrary.mk:147: build-ghc-stamp] Error 1
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2