Build failure on OpenBSD: expected unqualified-id instead of fileno

[bentley]

OpenBSD 6.3 -current, with clang-6.0.0:

[27/210] /usr/ports/pobj/libosmium-2.14.0/bin/c++  -DOSMIUM_WITH_SPARSEHASH=1 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -isystem /usr/local/include -I/usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/include -O2 -pipe -g -DNDEBUG   -std=c++11 -pthread -MD -MT examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o -MF examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o.d -o examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o -c /usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/examples/osmium_read_with_progress.cpp
FAILED: examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o 
/usr/ports/pobj/libosmium-2.14.0/bin/c++  -DOSMIUM_WITH_SPARSEHASH=1 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -isystem /usr/local/include -I/usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/include -O2 -pipe -g -DNDEBUG   -std=c++11 -pthread -MD -MT examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o -MF examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o.d -o examples/CMakeFiles/osmium_read_with_progress.dir/osmium_read_with_progress.cpp.o -c /usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/examples/osmium_read_with_progress.cpp
In file included from /usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/examples/osmium_read_with_progress.cpp:23:
In file included from /usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/include/osmium/io/any_input.hpp:46:
In file included from /usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/include/osmium/io/any_compression.hpp:45:
/usr/ports/pobj/libosmium-2.14.0/libosmium-2.14.0/include/osmium/io/bzip2_compression.hpp:151:66: error: expected unqualified-id
                            osmium::io::detail::reliable_fsync(::fileno(m_file));
                                                                 ^
/usr/include/stdio.h:406:19: note: expanded from macro 'fileno'
#define fileno(p)       (!__isthreaded ? __sfileno(p) : (fileno)(p))
                        ^
1 error generated.
ninja: build stopped: subcommand failed.

[joto]

Looks like fileno is a macro on OpenBSD, so the :: throws it off. Try removing the :: in front of fileno and report back. If this fixes it, I'll change the code.

[bentley]

Removing :: does fix it.