Hello all, Compiling a fresh version of Gem5 (master, ad9a233ff9fdaadbbdebef32af242c8e3c05bfd4) generates the following compilation error when doing a cross compilation from Ubuntu x86 to Debian x86 (Jessie) (tl;dr variable "__storage" is not initialized before used):
schroot -c jessie -- scons -j8 build/ARM/gem5.opt In file included from build/ARM/sim/eventq.hh:53:0, from build/ARM/sim/sim_object.hh:57, from build/ARM/cpu/intr_control.hh:39, from build/ARM/dev/arm/gic_v2.hh:55, from build/ARM/dev/arm/gic_v2.cc:44: build/ARM/sim/serialize.hh: In function 'void arrayParamIn(CheckpointIn&, const string&, T*, unsigned int) [with T = BitfieldBackend::BitUnionOperators<GicV2::BitfieldUnderlyingClassesCTLR>; std::string = std::basic_string<char>]': build/ARM/sim/serialize.hh:292:58: error: 'scalar_value.BitfieldBackend::BitUnionOperators<GicV2::BitfieldUnderlyingClassesCTLR>::<anonymous>.GicV2::BitfieldUnderlyingClassesCTLR::<anonymous>.GicV2::BitfieldUnderlyingClassesCTLR::<anonymous union>::__storage' may be used uninitialized in this function [-Werror=maybe-uninitialized] auto storage = static_cast<BitUnionBaseType<T>>(value); ^ build/ARM/sim/serialize.hh:507:11: note: 'scalar_value.BitfieldBackend::BitUnionOperators<GicV2::BitfieldUnderlyingClassesCTLR>::<anonymous>.GicV2::BitfieldUnderlyingClassesCTLR::<anonymous>.GicV2::BitfieldUnderlyingClassesCTLR::<anonymous union>::__storage' was declared here T scalar_value; schroot's "g++ -v": COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-10+deb8u1' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify --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-4.9-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --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 4.9.2 (Debian 4.9.2-10+deb8u1) I tried fixing within the desirable file (i.e., bitunion.hh), but the code there is confusing, so I couldn't make it work there. As I don't want to add a dirty/broken fix (i.e., add a call to value.setter in parseParam before the static cast; it seems to work, but I don't want to risk it since I don't know if the param can be of BitfieldROType at that point), I would like to ask those who are more familiar with this part of the code to take a look at it. Regards,Daniel _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
