I can build cypari with SAGE_CHECK=yes, everything passes. But
pari(10^20) is a problem.
Could anyone point me possible causes?

sage: pari(10^19)
10000000000000000000
sage: pari(10^20)
7766279631452241920

sage:
Exiting Sage (CPU time 0m0.15s, Wall time 0m28.21s).

PARI/GP does work on this example, though:

$ ./sage -gp
                                            GP/PARI CALCULATOR Version
2.11.1 (released)
                                        amd64 running freebsd (x86-64
kernel) 64-bit version
              compiled: Jul 18 2019, FreeBSD clang version 6.0.1
(tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
                                                      threading engine: single
                                          (readline not compiled in,
extended help enabled)

                                               Copyright (C) 2000-2018
The PARI Group

PARI/GP is free software, covered by the GNU General Public License,
and comes WITHOUT ANY WARRANTY WHATSOEVER.

Type ? for help, \q to quit.
Type ?17 for how to get moral (and possibly technical) support.

parisize = 8000000, primelimit = 500000
? 10^19
%1 = 10000000000000000000
? 10^20
%2 = 100000000000000000000

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