Dear GiNaC Team,

When I tried to use GiNaC to calculate cos(cos(1/2)),I got a Segmentation Fault.

My environment is as following:

CPU: Intel i7-10750H

Windows10 21H2

gcc version 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh)

GiNaC 1.8.5

CLN 1.3.6

GMP 6.2.1

ArchLinux(in VMwave)

Kernel: 6.1.9-arch1-1

GiNaC 1.8.4 installed by pacman

CLN 1.3.6 installed by pacman

gcc version 12.2.1 20230111(GCC)

Relative code file is attached

The program crash at line 8.I tried to compile and run the same program at ArchLinux(GCC 12.2.1 GiNaC 1.8.4 CLN 1.3.6),and also got a segmentation fault.

Besides , I tried to use ginsh to execute “cos(cos(1/2));” in ArchLinux ,it gave a error:

Internal error: statement in file float/misc/cl_F_extendsqrt.cc, line 30 has been reached!!

The same error also occurred at Windows,but it just exit without the information above.

After that, I built some lower version of GiNaC in Windows10 and re-run my code.I found the bug disappeared at GiNaC 1.8.3 . After reading the commit history I rollback ginac\inifcns_trans.cpp to version 1.8.3 and rebuilt ,the bug disappeared.

All my best,
-Weng Zhanyang.