Error compiling on debian sid with clang-8 #15551

https://github.com/bitcoin-core/secp256k1/issues/594

$ ./configure CC=clang-8 CXX=clang++-8 --with-incompatible-bdb
...
$ make
Making all in src
make[1]: Entering directory '/root/bitcoin/src'
make[2]: Entering directory '/root/bitcoin/src'
make[3]: Entering directory '/root/bitcoin'
make[3]: Leaving directory '/root/bitcoin'
make[3]: Entering directory '/root/bitcoin/src/secp256k1'
  CC       src/libsecp256k1_la-secp256k1.lo
In file included from src/secp256k1.c:12:
In file included from ./src/scalar_impl.h:20:
./src/scalar_4x64_impl.h:379:19: error: value '4624529908474429119' out of range for constraint 'n'
    : "S"(l), "n"(SECP256K1_N_C_0), "n"(SECP256K1_N_C_1)
                  ^~~~~~~~~~~~~~~
./src/scalar_4x64_impl.h:17:25: note: expanded from macro 'SECP256K1_N_C_0'
#define SECP256K1_N_C_0 (~SECP256K1_N_0 + 1)
                        ^~~~~~~~~~~~~~~~~~~~
./src/scalar_4x64_impl.h:458:74: error: value '4624529908474429119' out of range for constraint 'n'
    : "g"(m0), "g"(m1), "g"(m2), "g"(m3), "g"(m4), "g"(m5), "g"(m6), "n"(SECP256K1_N_C_0), "n"(SECP256K1_N_C_1)
                                                                         ^~~~~~~~~~~~~~~
./src/scalar_4x64_impl.h:17:25: note: expanded from macro 'SECP256K1_N_C_0'
#define SECP256K1_N_C_0 (~SECP256K1_N_0 + 1)
                        ^~~~~~~~~~~~~~~~~~~~
./src/scalar_4x64_impl.h:504:64: error: value '4624529908474429119' out of range for constraint 'n'
    : "g"(p0), "g"(p1), "g"(p2), "g"(p3), "g"(p4), "D"(r), "n"(SECP256K1_N_C_0), "n"(SECP256K1_N_C_1)
                                                               ^~~~~~~~~~~~~~~
./src/scalar_4x64_impl.h:17:25: note: expanded from macro 'SECP256K1_N_C_0'
#define SECP256K1_N_C_0 (~SECP256K1_N_0 + 1)
                        ^~~~~~~~~~~~~~~~~~~~
3 errors generated.
make[3]: *** [Makefile:1029: src/libsecp256k1_la-secp256k1.lo] Error 1
make[3]: Leaving directory '/root/bitcoin/src/secp256k1'
make[2]: *** [Makefile:14434: secp256k1/libsecp256k1.la] Error 2
make[2]: Leaving directory '/root/bitcoin/src'
make[1]: *** [Makefile:12984: all-recursive] Error 1
make[1]: Leaving directory '/root/bitcoin/src'
make: *** [Makefile:775: all-recursive] Error 1

This will be solved up-upstream before the official clang 8 release, see the links/discussion in https://github.com/bitcoin-core/secp256k1/issues/594.

Upstream fix: https://github.com/bitcoin-core/secp256k1/pull/599

I will retest when rc4 (https://github.com/llvm/llvm-project/releases/tag/llvmorg-8.0.0-rc4) is packaged in debian sid. rc4 includes https://github.com/llvm/llvm-project/commit/768197544c71234dfc83cfc9984a0e9ed7ab33be and https://github.com/llvm/llvm-project/commit/2cc470aae1a15e6ac06a4c0e04b1ac44976b20c4

Worked with

clang++-8 --version
clang version 8.0.0-+rc4-1 (tags/RELEASE_800/rc4)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin