Re: [ANN] Lua 5.2.0 (rc5) now available

[liam mail <liam.list@...>]

On Wednesday, 7 December 2011, Denis Naumov <alexander.me@gmail.com> wrote:
> Not a glitch, but ...
>
> Compiling with Visual Studio 2010 + Warning level 4.
>
> warning C4244: '=' : conversion from '...' to '...', possible loss of data.
>
> some places like:
> ---  lparser.c (658)  ---------------------------
> static void recfield (LexState *ls, struct ConsControl *cc)
> {
>    // ... some code
>    int reg = ls->fs->freereg;                               <<<
> warning  freereg is lu_byte
>
>    // ... some code - reg not used !!!
>
>    fs->freereg = reg;  /* free registers */             <<< warning
> freereg is lu_byte
> }
> -----------------------------------------------------
>
> in cases like this - 'reg' can be lu_byte.
>
> + some places - need explicit type conversion to avoid warnings.
>
> full warning list:
>
> 2>------ Rebuild All started: Project: lua52, Configuration: Release x64 ------
> 2> lapi.c
> 2> lauxlib.c
> 2>..\src\lauxlib.c(602): warning C4244: '=' : conversion from 'int' to
> 'char', possible loss of data
> 2>..\src\lauxlib.c(650): warning C4244: '=' : conversion from 'int' to
> 'char', possible loss of data
> 2> lbaselib.c
> 2> lbitlib.c
> 2> lcode.c
> 2>..\src\lcode.c(273): warning C4244: '+=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lcode.c(706): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lcode.c(707): warning C4244: '=' : conversion from 'int' to
> 'short', possible loss of data
> 2>..\src\lcode.c(880): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2> lcorolib.c
> 2> lctype.c
> 2> ldblib.c
> 2> ldebug.c
> 2> ldo.c
> 2>..\src\ldo.c(79): warning C4324: 'lua_longjmp' : structure was
> padded due to __declspec(align())
> 2>..\src\ldo.c(309): warning C4244: '=' : conversion from 'int' to
> 'short', possible loss of data
> 2>..\src\ldo.c(333): warning C4244: '=' : conversion from 'int' to
> 'short', possible loss of data
> 2>..\src\ldo.c(465): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2> ldump.c
> 2> lfunc.c
> 2> lgc.c
> 2>..\src\lgc.c(224): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lgc.c(784): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lgc.c(1095): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2> linit.c
> 2> liolib.c
> 2> llex.c
> 2> lmathlib.c
> 2> lmem.c
> 2> loadlib.c
> 2> lobject.c
> 2> lopcodes.c
> 2> loslib.c
> 2> lparser.c
> 2>..\src\lparser.c(441): warning C4244: '=' : conversion from 'int' to
> 'short', possible loss of data
> 2>..\src\lparser.c(442): warning C4244: '=' : conversion from 'int' to
> 'short', possible loss of data
> 2>..\src\lparser.c(675): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lparser.c(868): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lparser.c(1123): warning C4244: '=' : conversion from 'int'
> to 'lu_byte', possible loss of data
> 2>..\src\lparser.c(1128): warning C4244: '=' : conversion from 'int'
> to 'short', possible loss of data
> 2>..\src\lparser.c(1161): warning C4244: '-=' : conversion from 'int'
> to 'lu_byte', possible loss of data
> 2> lstate.c
> 2> lstring.c
> 2> lstrlib.c
> 2>..\src\lstrlib.c(86): warning C4244: '=' : conversion from 'int' to
> 'char', possible loss of data
> 2>..\src\lstrlib.c(99): warning C4244: '=' : conversion from 'int' to
> 'char', possible loss of data
> 2> ltable.c
> 2> ltablib.c
> 2> ltm.c
> 2> lundump.c
> 2>..\src\lundump.c(139): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2>..\src\lundump.c(140): warning C4244: '=' : conversion from 'int' to
> 'lu_byte', possible loss of data
> 2> lvm.c
> 2> lzio.c
> -------------------------------------------------
>
>
> Thanks
>
>


IIRC the powers that be have stated that /W3 is all that Lua is going to support, so warnings are expected at /W4 :(

Liam