Bug#831071: mixxx: FTBFS with GCC 6: src/util/fpclassify.h:22:20: error: 'std::util_fpclassify' has not been declared

[Lucas Nussbaum]

Source: mixxx
Version: 2.0.0~dfsg-4
Severity: serious
Tags: stretch sid
User: debian-qa at lists.debian.org
Usertags: qa-ftbfs-20160713 qa-ftbfs
Justification: FTBFS with GCC 6 on amd64

Hi,

During a rebuild of all packages in sid using the gcc-defaults package
available in experimental to make GCC default to version 6, your package failed
to build on amd64. For more information about GCC 6 and Stretch, see:
- https://wiki.debian.org/GCC6
- https://lists.debian.org/debian-devel-announce/2016/06/msg00007.html

Relevant part (hopefully):
> g++ -o lin64_build/analyserqueue.o -c -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -pipe -Wall -Wextra -g -pthread -O3 -ffast-math -funroll-loops -fomit-frame-pointer -mtune=generic -Damd64 -DMIXXX_BUILD_RELEASE -D'Q_ASSERT(x)=qt_noop()' -D__LINUX__ -D__UNIX__ -DSETTINGS_PATH=\".mixxx/\" -DSETTINGS_FILE=\"mixxx.cfg\" -DUNIX_SHARE_PATH=\"/usr/share/mixxx\" -DUNIX_LIB_PATH=\"/usr/lib/mixxx\" -D__PORTAUDIO__ -DQT_SHARED -DQT_TABLET_SUPPORT -DQT_CORE_LIB -DQT_GUI_LIB -DQT_OPENGL_LIB -DQT_XML_LIB -DQT_SVG_LIB -DQT_SQL_LIB -DQT_SCRIPT_LIB -DQT_NETWORK_LIB -DQT_SHARED -D__SNDFILE__ -D__MAD__ -D__HID__ -D__BULK__ -D__VINYLCONTROL__ -D__SHOUTCAST__ -D__OPUS__ -DDISABLE_BUILDTIME -DHAVE_FFTW3 -D__AUTODJCRATES__ -D__SQLITE3__ -Ilin64_build -Isrc -I/usr/include/soundtouch -Ilib/replaygain -I/usr/include/qt4 -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtSvg -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtCore -Ilib/gtest-1.7.0/include -Ilib/fidlib-0.9.10 -I/usr/include/taglib -I/usr/include/libusb-1.0 -Ilib/xwax -Ilib/scratchlib -I/usr/include/opus src/analyserqueue.cpp
> In file included from src/util/math.h:11:0,
>                  from src/util/types.h:4,
>                  from src/analyser.h:4,
>                  from src/analyserqueue.h:11,
>                  from src/analyserqueue.cpp:8:
> src/util/fpclassify.h:22:20: error: 'std::util_fpclassify' has not been declared
>  #define fpclassify util_fpclassify
>                     ^
> src/util/fpclassify.h:23:18: error: 'std::util_isfinite' has not been declared
>  #define isfinite util_isfinite
>                   ^
> src/util/fpclassify.h:20:15: error: 'std::util_isinf' has not been declared
>  #define isinf util_isinf
>                ^
> src/util/fpclassify.h:19:15: error: 'std::util_isnan' has not been declared
>  #define isnan util_isnan
>                ^
> src/util/fpclassify.h:21:18: error: 'std::util_isnormal' has not been declared
>  #define isnormal util_isnormal
>                   ^
> scons: *** [lin64_build/analyserqueue.o] Error 1
> scons: building terminated because of errors.
> make[1]: *** [override_dh_auto_build] Error 2

The full build log is available from:
   http://people.debian.org/~lucas/logs/2016/07/13/mixxx_2.0.0~dfsg-4_unstable_gcc6.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.