Re: [Caml-list] Build failure under Visual Studio 2015

[Alain Frisch <alain@frisch.fr>]

Hi Shayne,

This could come from .obj files shipped with flexdll.  You could try to 
produce new versions of flexdll_msvc.obj, flexdll_initer_msvc.obj (and 
the *msvc64.obj versions) by recompiling sources with MSVC 14.  Sources 
can be found:

https://github.com/alainfrisch/flexdll

See also the Makefile for build instructions on these .obj files.

Let us know how this goes!

Alain



On 06/24/2015 03:39 PM, Shayne Fletcher wrote:
> I decided to experiment with the Microsoft Visual Studio 2015 release
> candidate. This bundle contains msvc-14.0 for which `_MSC_VER` has the
> value 1900.
>
> Some warnings are silenced with this patch to byterun/floats.c
>
>    #if defined (_MSC_VER)
>    #  include <float.h>
>    #  if(MSC_VER < 1900)
>    #    define isnan _isnan
>    #    define isfinite _finite
>    #  endif/*(MSC_VER <= 1400)*/
>    #endif /*defined(_MSC_VER)*/
>
> There is a problem though that comes about here in the production of
> 'ocamlrun.exe':
>
> link -lib -nologo -machine:AMD64 /out:libcamlrun.lib interp.obj misc.obj
> stacks.obj fix_code.obj startup_aux.obj startup.obj freelist.obj
> major_gc.obj minor_gc.obj memory.obj alloc.obj roots.obj globroots.obj
> fail.obj signals.obj signals_byt.obj printexc.obj backtrace.obj
> compare.obj ints.obj floats.obj str.obj array.obj io.obj extern.obj
> intern.obj hash.obj sys.obj meta.obj parsing.obj gc_ctrl.obj
> terminfo.obj md5.obj obj.obj lexing.obj callback.obj debugger.obj
> weak.obj compact.obj finalise.obj custom.obj dynlink.obj win32.obj main.obj
> cl -nologo -D_CRT_SECURE_NO_DEPRECATE
> -DOCAML_STDLIB_DIR='"C:/ocaml-msvc14/lib"' -I"C:\Program Files
> (x86)\flexdll" -O2 -Gy- -MD -c -o prims.obj prims.c
> cl : Command line warning D9035 : option 'o' has been deprecated and
> will be removed in a future release
> prims.c
> flexlink -x64 -merge-manifest -stack 33554432 -exe -o ocamlrun.exe
> prims.obj ws2_32.lib \
>            libcamlrun.lib
> ** Cannot resolve symbols for descriptor object:
>   __iob_func
>   sprintf
> Makefile.nt:23: recipe for target 'ocamlrun.exe' failed
>
> The second of those missing symbols 'sprintf' can be resolved with this
> addition to config/Makefile, line 99
>
>    EXTRALIBS=legacy_stdio_wide_specifiers.lib legacy_stdio_definitions.lib
>
> so that the flexlink step reads
>
>    flexlink -x64 -merge-manifest -stack 33554432 -v -exe -o ocamlrun.exe
> prims.obj ws2_32.lib legacy_stdio_wide_specifiers.lib
> legacy_stdio_definitions.lib libcamlrun.lib
>
> but the issue with '__iob_func' remains.
>
> I've always associated this sort of problem in the past with mismatch
> between /MD and /MT. Research also indicates that this error can
> manifest when linking under msvc-14 against objects built with an older
> version of the compiler. In any case, after scratching around on it for
> an hour or two, I haven't yet found a way to overcome the link failure.
>
> I don't know for sure whether we are looking at a problem with the
> release candidate or, a problem with the build system with this new
> compiler. I do have a lead or two left to follow - if I have any success
> at overcoming this problem, I'll post here.
>
> --
> Shayne Fletcher