Tests failing with RLP + TTmath + Clang or Mingw64

[mratsim]

But passes with GCC: see https://travis-ci.org/status-im/nimbus/builds/365142358

Error: execution of an external compiler program 'clang++ -c  -w -I/Users/travis/.nimble/pkgs/ttmath-#master  -I/Users/travis/build/status-im/nimbus/nim/lib -o /Users/travis/build/status-im/nimbus/nimcache/stdlib_system.o /Users/travis/build/status-im/nimbus/nimcache/stdlib_system.cpp' failed with exit code: 1
/Users/travis/build/status-im/nimbus/nimcache/rlp_writer.cpp:1273:2: error: no matching function for call to 'append_naEuvp5Ccas8eW7spRt2Wg'
        append_naEuvp5Ccas8eW7spRt2Wg(self, (*data).table, 4);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/travis/build/status-im/nimbus/nimcache/rlp_writer.cpp:1238:31: note: candidate function not viable: no known conversion from 'uint [4]' to 'NU *' (aka 'unsigned long long *') for 2nd argument
N_LIB_PRIVATE N_NIMCALL(void, append_naEuvp5Ccas8eW7spRt2Wg)(tyObject_RlpWriter_FzncMjzrGRTHJi822CxGrw& self, NU* list, NI listLen_0) {
                              ^
/Users/travis/build/status-im/nimbus/nim/lib/nimbase.h:243:44: note: expanded from macro 'N_NIMCALL'
#  define N_NIMCALL(rettype, name) rettype name /* no modifier */
                                           ^
1 error generated.

[mratsim]

Calling Uint256.table directly gives:

/Users/…/Programming/Status/nimbus/nimcache/nimbus_state_db.cpp:461:3: error: no matching function for call to 'encode_h7fdG49aHDY58PW6mYPq9c1g'
                encode_h7fdG49aHDY58PW6mYPq9c1g((*value).table, (&encodedValue));
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/…/Programming/Status/nimbus/nimcache/nimbus_state_db.cpp:270:31: note: candidate function not viable: no known conversion from 'uint [4]' to 'NU *' (aka 'unsigned long long *') for 1st argument
N_LIB_PRIVATE N_NIMCALL(void, encode_h7fdG49aHDY58PW6mYPq9c1g)(tyArray_E4hFScS5RHYRwrczefWt3A v, tyObject_Range_mvv1otmKT6xZLlznKeDC5A* Result);
                              ^
/Users/…/.choosenim/toolchains/nim-#devel/lib/nimbase.h:243:44: note: expanded from macro 'N_NIMCALL'
#  define N_NIMCALL(rettype, name) rettype name /* no modifier */

reproduced by @coffeepots with mingw on Windows

[coffeepots]

Fails for mingw64:

CC: nimbus_gas_costs
failed with exit code: 1

C:\Status\BRANCHES\nimbus-Use-memrange-and-rlp-master\tests\nimcache\nimbus_state_db.cpp: In function 'void setStorage_u1XtG2ijM9aric1MWfCv6oQ(tyObject_AccountStateDBcolonObjectType__UA7Nrr9aPmeDLcrZdhIuqVQ*&, NimStringDesc*, TY_fSgjjjotfhO8wSAxXj6bfw*, TY_fSgjjjotfhO8wSAxXj6bfw*)':
C:\Status\BRANCHES\nimbus-Use-memrange-and-rlp-master\tests\nimcache\nimbus_state_db.cpp:456:66: error: cannot convert 'ttmath::uint* {aka long unsigned int*}' to 'NU* {aka long long unsigned int*}' for argument '1' to 'void encode_h7fdG49aHDY58PW6mYPq9c1g(NU*, tyObject_Range_mvv1otmKT6xZLlznKeDC5A*)'
   encode_h7fdG49aHDY58PW6mYPq9c1g((*value).table, (&encodedValue));
                                                                  ^

[mratsim]

GCC and VCC works though.