Bug#984170: haskell-cairo: ftbfs with GCC-11

[Matthias Klose]

Package: src:haskell-cairo
Version: 0.13.8.1-1
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-cairo_0.13.8.1-1_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.

[...]
Libraries installed in:
/usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.8.4/cairo-0.13.8.1-9ROOXD4as1uLn8sCpDXiTi
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/cairo-0.13.8.1
Data files installed in: /usr/share/cairo
Documentation installed in:
/usr/share/doc/x86_64-linux-ghc-8.8.4/cairo-0.13.8.1
Configuration files installed in: /usr/etc
No alex found
Using ar found on system at: /usr/bin/x86_64-linux-gnu-ar
No c2hs found
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 gtk2hsC2hs version 0.13.13 found on system at: /usr/bin/gtk2hsC2hs
Using gtk2hsHookGenerator found on system at: /usr/bin/gtk2hsHookGenerator
Using gtk2hsTypeGen found on system at: /usr/bin/gtk2hsTypeGen
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
Using hscolour version 1.24 found on system at: /usr/bin/HsColour
No jhc found
Using ld found on system at: /usr/bin/x86_64-linux-gnu-ld.gold
Using pkg-config version 0.29.2 found on system at: /usr/bin/pkg-config
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
/usr/bin/pkg-config --modversion cairo
/usr/bin/pkg-config --modversion cairo-pdf
/usr/bin/pkg-config --modversion cairo-ps
/usr/bin/pkg-config --modversion cairo-svg
touch configure-ghc-stamp
. /usr/share/haskell-devscripts/Dh_Haskell.sh &&\
haddock_recipe
Running debian/hlibrary.setup haddock --builddir=dist-ghc --with-haddock=/usr/bin/haddock --with-ghc=ghc --verbose=2 --html --hoogle --haddock-options=\"--mathjax=file:///usr/share/javascript/mathjax/MathJax.js\" --hyperlink-source
/usr/bin/haddock --version
/usr/bin/ghc --numeric-version
/usr/bin/haddock --ghc-version '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
/usr/bin/ghc --print-libdir
/usr/bin/ghc-pkg init dist-ghc/package.conf.inplace
creating dist-ghc/build
creating dist-ghc/build/autogen
creating dist-ghc/build/autogen
Preprocessing library for cairo-0.13.8.1..
creating dist-ghc/build/Graphics/Rendering/Cairo
creating dist-ghc/build/Graphics/Rendering
creating dist-ghc/build/Graphics
creating dist-ghc/build/Graphics/Rendering
creating dist-ghc/build/Graphics/Rendering/Cairo
hlibrary.setup: Error in C header file.

cairo-gtk2hs.i:1: (column 1) [FATAL] 
  >>> Lexical error!
  The character '#' does not fit here.

Haddock failed (no modules?), refusing to create empty documentation package.
make: *** [/usr/share/cdbs/1/class/hlibrary.mk:173: build-haddock-stamp] Error 1
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2