Re: [PULL 00/53] Misc patches for QEMU 5.1 soft freeze

[Claudio Fontana]

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