Hi,
Let me try to reproduce the whole process with original GMP source:
1. I've downloaded https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz
2. Exported my CFLAGS with LTO enabled:
export COMMON_FLAGS="-O3 -march=native -mcpu=native -pipe -funroll-loops \
-fomit-frame-pointer -fforce-addr -ftracer -fno-stack-protector -flto"
export CFLAGS="${COMMON_FLAGS}"
export CXXFLAGS="${COMMON_FLAGS}"
3. Configure, make & install GMP with gcc version 12.2.1 20221231:
./configure --prefix=/usr/ --libdir=/usr/lib64/ --enable-cxx
make -j4
make install
4. Cloned iproute2:
git clone git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
5. Try to compile iproute2 with hang as follows:
CC tc_cbq.o
CC tc_estimator.o
... hangs here ...
6. Commented out the following piece of iproute2 code in tc/tc_estimator.c:
// if (A/(-log(w)) > time_const)
// break;
7. Continued to compile iproute2 and compilation went OK
Same error was reproduced with current https://gmplib.org/repo/gmp-6.2/
Switching off LTO let iproute2 compile OK
Regards!
пт, 6 янв. 2023 г. в 15:00, Torbjörn Granlund :
> Some One writes:
>
> I've found the problem related to GCC LTO optimization for GMP for ARM
> aarch64
> under QEMU with ARM Neoverse-N1 virt-4.2 (Oracle Cloud) and ARM virt-7.2
> (Apple M1)
> both running the latest Gentoo with gmp-6.2.1-r5 compiled by both
> gcc version 11.3.1 20221209 and gcc version 12.2.1 20221231.
>
> To reproduce:
> 1. Compile GMP with LTO optimization -- compiles OK
> 2. Try to compile iproute2-6.1.0 or cmake-3.25.1 -- compilation hangs
> during the process
>
> Disabling LTO optimization for GMP solves the problem.
>
> I would not expect any GMP developer to attempt to reproduce this
> problem. You're using a patched GMP ("-r5") in an environment which
> would be very close to impossible to reproduce!
>
> You need to isolate this problem and only then report it to the package
> maintainer of the buggy program.
>
> --
> Torbjörn
> Please encrypt, key id 0xC8601622
>
___
gmp-bugs mailing list
gmp-bugs@gmplib.org
https://gmplib.org/mailman/listinfo/gmp-bugs
