https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78567
Bug ID: 78567 Summary: GCC trunk fails to compile all-stage2-gcc in i386.c Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: marc.mutz at kdab dot com Target Milestone: --- Last successful built was 5th of October (yielding gcc version 7.0.0 20161005 (experimental) (GCC)), this failure persists since somewhen around the beginning of November: make[3]: Entering directory '/home/marc/C++/gcc-build/gcc' /home/marc/C++/gcc-build/./prev-gcc/xg++ -B/home/marc/C++/gcc-build/./prev-gcc/ -B/d/gcc/trunk/x86_64-pc-linux-gnu/bin/ -nostdinc++ -B/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -I/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include -I/home/marc/C++/gcc/libstdc++-v3/libsupc++ -L/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/home/marc/C++/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -fno-PIE -c -g -O2 -gtoggle -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/bid -I../libdecnumber -I../../gcc/gcc/../libbacktrace -o i386.o -MT i386.o -MMD -MP -MF ./.deps/i386.TPo ../../gcc/gcc/config/i386/i386.c ../../gcc/gcc/config/i386/i386.c: In function ‘rtx_def* ix86_expand_builtin(tree, rtx, rtx, machine_mode, int)’: ../../gcc/gcc/config/i386/i386.c:38407:18: error: ‘fcn’ may be used uninitialized in this function [-Werror=maybe-uninitialized] emit_insn (fcn (target, accum, wide_reg, mem)); ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1plus: all warnings being treated as errors Makefile:2198: recipe for target 'i386.o' failed make[3]: *** [i386.o] Error 1 make[3]: Leaving directory '/home/marc/C++/gcc-build/gcc' Makefile:4589: recipe for target 'all-stage2-gcc' failed make[2]: *** [all-stage2-gcc] Error 2 make[2]: Leaving directory '/home/marc/C++/gcc-build' Makefile:24513: recipe for target 'stage2-bubble' failed make[1]: *** [stage2-bubble] Error 2 make[1]: Leaving directory '/home/marc/C++/gcc-build' Makefile:935: recipe for target 'all' failed make: *** [all] Error 2 Host compiler is $ g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.4' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) Configure line: configure --prefix=/d/gcc/trunk --enable-checking=release --enable-languges=c,c++,fortran,lto,objc,obj-c++ (out-of-souce build, clean except for config.status, which was how this build was configured)