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
