Dear Weng Zhanyang, Thanks for reporting the bug, it was introduced by me. Although expression like cos(numeric(1, 2)) is not a symbolic, it neither is numeric in the sense of CLN library (as it is erroneously produced now). I am attaching a patch to fix this. Best wishes, Vladimir -- Vladimir V. Kisil http://www1.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Maps https://doi.org/10.1142/p835 Soft: Geometry of cycles http://moebinv.sourceforge.net/ Jupyter notebooks: https://github.com/vvkisil?tab=repositories

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On Mon, 6 Feb 2023 13:23:55 +0000, 翁湛阳 <cosine@pcbcos.xyz> said:

WZ> Dear GiNaC Team, When I tried to use GiNaC to calculate WZ> cos(cos(1/2)),I got a Segmentation Fault. My environment is as WZ> following: CPU: Intel i7-10750H Windows10 21H2 gcc version WZ> 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) GiNaC 1.8.5 CLN 1.3.6 WZ> GMP 6.2.1 WZ> ArchLinux(in VMwave) Kernel: 6.1.9-arch1-1 GiNaC 1.8.4 installed WZ> by pacman CLN 1.3.6 installed by pacman gcc version 12.2.1 WZ> 20230111(GCC) WZ> Relative code file is attached The program crash at line 8.I WZ> tried to compile and run the same program at ArchLinux(GCC WZ> 12.2.1 GiNaC 1.8.4 CLN 1.3.6),and also got a segmentation fault. WZ> Besides , I tried to use ginsh to execute “cos(cos(1/2));” in WZ> ArchLinux ,it gave a error: Internal error: statement in file WZ> float/misc/cl_F_extendsqrt.cc, line 30 has been reached!! WZ> The same error also occurred at Windows,but it just exit without WZ> the information above. WZ> After that, I built some lower version of GiNaC in Windows10 and WZ> re-run my code.I found the bug disappeared at GiNaC 1.8.3 WZ> . After reading the commit history I rollback WZ> ginac\inifcns_trans.cpp to version 1.8.3 and rebuilt ,the bug WZ> disappeared. WZ> All my best, WZ> -Weng Zhanyang.