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

[Claudio Fontana]

On 7/8/20 6:16 PM, Paolo Bonzini wrote:
> On 08/07/20 18:13, Claudio Fontana wrote:
>> so I don't get any tcg_get_icount_limit() compiled in, and no
>> errors.
>>
>> I think that having comparable configure command line and compiler
>> version/flags would help me pin down any related issue.
> 
> Are you using link-time optimization by chance?
> 
> Paolo
> 

Yes unfortunately, nothing I have willingly enabled, but I found traces of LTO 
in C++.

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.

Thanks a lot, and sorry for the inconvenience!

Claudio