Source: mixxx
Version: 2.5.6+dfsg-2
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: debian-loongarch@lists.debian.org, sramacher@debian.org
User: debian-loongarch@lists.debian.org
Usertags: loong64

Dear maintainer,

mixxx FTBFS on loong64:

[  8%] Building CXX object CMakeFiles/mixxx-qml-mixxxcontrols.dir/obj-loongarch64-linux-gnu/.rcc/qmlcache/mixxx-qml-mixxxcontrols_res_qml_Mixxx_Controls_Slider_qml.cpp.o
/usr/bin/loongarch64-linux-gnu-g++ -DMIXXX_USE_QML -DMIXXX_USE_QOPENGL -DQT_CORE_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_QMLINTEGRATION_LIB -DQT_QML_LIB -DUSE_BENCH -I/build/reproducible-path/mixxx-2.5.6+dfsg/obj-loongarch64-linux-gnu/mixxx-qml-mixxxcontrols_autogen/include -I/build/reproducible-path/mixxx-2.5.6+dfsg -isystem /usr/include/loongarch64-linux-gnu/qt6/QtQml -isystem /usr/include/loongarch64-linux-gnu/qt6 -isystem /usr/include/loongarch64-linux-gnu/qt6/QtCore -isystem /usr/lib/loongarch64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/loongarch64-linux-gnu/qt6/QtQmlIntegration -isystem /usr/include/loongarch64-linux-gnu/qt6/QtNetwork -g -O2 -ffile-prefix-map=/build/reproducible-path/mixxx-2.5.6+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -std=gnu++20 -fvisibility=hidden -fvisibility-inlines-hidden -pipe -ffast-math -funroll-loops -O3 -fomit-frame-pointer -MD -MT CMakeFiles/mixxx-qml-mixxxcontrols.dir/obj-loongarch64-linux-gnu/.rcc/qmlcache/mixxx-qml-mixxxcontrols_res_qml_Mixxx_Controls_Slider_qml.cpp.o -MF CMakeFiles/mixxx-qml-mixxxcontrols.dir/obj-loongarch64-linux-gnu/.rcc/qmlcache/mixxx-qml-mixxxcontrols_res_qml_Mixxx_Controls_Slider_qml.cpp.o.d -o CMakeFiles/mixxx-qml-mixxxcontrols.dir/obj-loongarch64-linux-gnu/.rcc/qmlcache/mixxx-qml-mixxxcontrols_res_qml_Mixxx_Controls_Slider_qml.cpp.o -c /build/reproducible-path/mixxx-2.5.6+dfsg/obj-loongarch64-linux-gnu/.rcc/qmlcache/mixxx-qml-mixxxcontrols_res_qml_Mixxx_Controls_Slider_qml.cpp
during RTL pass: vartrack
/build/reproducible-path/mixxx-2.5.6+dfsg/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp: In member function ‘std::vector<int> TempoTrack::process(std::vector<double>, std::vector<double>*)’:
/build/reproducible-path/mixxx-2.5.6+dfsg/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp:781:1: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1193
  781 | }
      | ^
0x121cc31df diagnostics::context::diagnostic_impl(rich_location*, diagnostics::metadata const*, diagnostics::option_id, char const*, void**, diagnostics::kind)
	???:0
0x121cafee7 internal_error(char const*, ...)
	???:0
0x120208dd3 fancy_abort(char const*, int, char const*)
	???:0
0x1207b9933 gen_reg_rtx(machine_mode)
	???:0
0x1207d046b copy_to_reg(rtx_def*)
	???:0
0x120cb28c7 gen_lowpart_general(machine_mode, rtx_def*)
	???:0
0x120cf65f7 simplify_context::simplify_binary_operation_1(rtx_code, machine_mode, rtx_def*, rtx_def*, rtx_def*, rtx_def*)
	???:0
0x120cea87f simplify_context::simplify_binary_operation(rtx_code, machine_mode, rtx_def*, rtx_def*)
	???:0
0x120d05753 simplify_rtx(rtx_def const*)
	???:0
0x121155bb3 emit_note_insn_var_location(variable**, emit_note_data*)
	???:0
/usr/libexec/gcc/loongarch64-linux-gnu/16/cc1plus -quiet -imultilib . -imultiarch loongarch64-linux-gnu -MD CMakeFiles/QueenMaryDsp.dir/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp.d -MF CMakeFiles/QueenMaryDsp.dir/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp.o.d -MT CMakeFiles/QueenMaryDsp.dir/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp.o -D_GNU_SOURCE -D MIXXX_USE_QML -D MIXXX_USE_QOPENGL -D USE_BENCH -D USE_PTHREADS -D kiss_fft_scalar=double -D _FORTIFY_SOURCE=2 -D _FORTIFY_SOURCE=2 -D NDEBUG -isystem /build/reproducible-path/mixxx-2.5.6+dfsg/lib/qm-dsp -isystem /build/reproducible-path/mixxx-2.5.6+dfsg/lib/qm-dsp/include /build/reproducible-path/mixxx-2.5.6+dfsg/lib/qm-dsp/dsp/tempotracking/TempoTrack.cpp -quiet -dumpdir CMakeFiles/QueenMaryDsp.dir/lib/qm-dsp/dsp/tempotracking/ -dumpbase TempoTrack.cpp.cpp -dumpbase-ext .cpp -mabi=lp64d -march=la64v1.0 -mfpu=64 -msimd=lsx -mcmodel=medium -mtune=generic -g -O2 -O3 -O3 -Wformat=1 -Werror=format-security -Wdate-time -std=gnu++20 -ffile-prefix-map=/build/reproducible-path/mixxx-2.5.6+dfsg=. -fstack-protector-strong -fvisibility=hidden -fvisibility-inlines-hidden -ffast-math -funroll-loops -fomit-frame-pointer -o -
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-16/README.Bugs> for instructions.

See
https://buildd.debian.org/status/fetch.php?pkg=mixxx&arch=loong64&ver=2.5.6%2Bdfsg-2%2Bb1&stamp=1790059050&raw=0
for details.

Cheers

Workaround:

--- mixxx-2.5.6+dfsg/debian/rules	2025-12-29 18:02:53.000000000 +0200
+++ mixxx-2.5.6+dfsg/debian/rules	2026-06-27 09:01:25.000000000 +0300
@@ -13,6 +13,11 @@
 		-DINSTALL_USER_UDEV_RULES=OFF \
 		-DKEYFINDER=OFF

+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127557
+ifneq (,$(filter $(DEB_HOST_ARCH), loong64))
+  CMAKE_OPTS += -DOPTIMIZE=OFF
+endif
+
 %:
 	dh $@ -Scmake