On 7/8/20 6:55 PM, Paolo Bonzini wrote: > On 08/07/20 18:45, Claudio Fontana wrote: >> C++ is used to link the final qemu-system binary and on my system c++ has >> LTO: >> >> c++ -v >> Using built-in specs. >> COLLECT_GCC=c++ >> COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/7/lto-wrapper >> OFFLOAD_TARGET_NAMES=hsa:nvptx-none >> Target: x86_64-suse-linux >> Configured with: ../configure --prefix=/usr --infodir=/usr/share/info >> --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 >> --enable-languages=c,c++,objc,fortran,obj-c++,ada,go >> --enable-offload-targets=hsa,nvptx-none=/usr/nvptx-none, >> --without-cuda-driver --enable-checking=release --disable-werror >> --with-gxx-include-dir=/usr/include/c++/7 --enable-ssp --disable-libssp >> --disable-libvtv --disable-libcc1 --disable-plugin >> --with-bugurl=https://bugs.opensuse.org/ --with-pkgversion='SUSE Linux' >> --with-slibdir=/lib64 --with-system-zlib --enable-libstdcxx-allocator=new >> --disable-libstdcxx-pch --enable-version-specific-runtime-libs >> --with-gcc-major-version-only --enable-linker-build-id --enable-linux-futex >> --enable-gnu-indirect-function --program-suffix=-7 >> --without-system-libunwind --enable-multilib --with-arch-32=x86-64 >> --with-tune=generic --build=x86_64-suse-linux --host=x86_64-suse-linux >> Thread model: posix >> gcc version 7.5.0 (SUSE Linux) >> >> >> I checked cc but did not think to check c++ . I will find a way to disable >> this thing and will correct the patch accordingly. > > Having LTO support is not the same thing as having it enabled. Are you > compiling and linking with "-flto"? > > Paolo >
no, the compilation and link stage do not show this explicit parameter. I am puzzled. C
