[Vm-dev] Minheadless trial

Ben Coman btc at openinworld.com
Mon Aug 6 19:57:17 UTC 2018

On 6 August 2018 at 23:54, Ben Coman <btc at openinworld.com> wrote:

> On 6 August 2018 at 13:22, Ben Coman <btc at openinworld.com> wrote:
> > and ends up with 4 link errors (and 6600 warnings)
> > Pharo.exe LNK1120 - 1 unresolved external
> > Pharow.exe LNK1120 - 1unresolved external
> > sqMain.c.obj LNK2019 - unresolved external symbol
> _imp_osvm_main referenced in function main
> > sqWin32Main.c.obj LNK2019 - unresolved external symbol _imp_osvm_main
> referenced in function WinMain
> So the following change to sqMain.c fixes the link error...
>     #define BUILD_VM_CORE
>     #include "OpenSmalltalkVM.h"
>     int
>     main(int argc, const char **argv)
>     {
>         return osvm_main(argc, argv);
>     }
> and similar for sqWin32Main.c.
The next roadbump is...
LNK2019 unresolved external symbol 'alloca' referenced in function
callIA32IntegralReturn  -- File PharoVMCore.lib(xabicc.c.obj)

>From the root folder, doing...
   find . -name xabicc.c
result in...

Googling for "alloca Visual Studio 2017" lead me to...
which indicates there is no "alloca" only "_alloca"

Now " xabicc.c" is a stub for including platform specific C code,
and the lovely defines-highlighting of Visual Studio indicates
is the active one right now,
so as a quick hack, jamming a define just above that include...

  #if i386|i486|i586|i686
  #  include "ia32abicc.c"
  #elif powerpc|ppc
  #  include "ppc32abicc.c"
  #elif x86_64|x64|__x86_64|__x86_64__|_M_AMD64|_M_X64
  # if _WIN64
  #     define alloca _alloca   // <<<QUICK HACK
  #     include "x64win64abicc.c"
  #  else
  #     include "x64sysvabicc.c"
  #  endif
  #elif __ARM_ARCH__|__arm__|__arm32__|ARM32
  #  include "arm32abicc.c"

allows CMake > Build All
==> Build succeeded.   Yay!

To determine a suitable permanent home for that define, doing...
   grep -R " _alloca"  *
from the root folder shows...
  platforms/Cross/plugins/IA32ABI/arm32abicc.c:# define alloca _alloca
  platforms/Cross/plugins/IA32ABI/ia32abicc.c:# define alloca _alloca
  platforms/Cross/plugins/IA32ABI/ppc32abicc.c:# define alloca _alloca
  platforms/Cross/plugins/SqueakFFIPrims/sqFFIPlugin.c:# define alloca
  platforms/minheadless/windows/sqPlatformSpecific-Win32.h:#    define
alloca _alloca
  platforms/unix/config/configure:#  define alloca _alloca
  platforms/win32/vm/sqPlatformSpecific.h:#    define alloca _alloca
  processors/ARM/gdb-7.10/include/alloca-conf.h:#    define alloca _alloca
  processors/IA32/bochs/bx_debug/parser.c:#    define alloca _alloca
  src/plugins/SqueakFFIPrims/ARM32FFIPlugin.c:# define alloca _alloca
  src/plugins/SqueakFFIPrims/IA32FFIPlugin.c:# define alloca _alloca
  src/plugins/SqueakFFIPrims/X64SysVFFIPlugin.c:# define alloca _alloca
  src/plugins/SqueakFFIPrims/X64Win64FFIPlugin.c:# define alloca _alloca

Interesting that there is a similar define for ia32abicc.c,
so comparing that with x64win64abicc.c (at
looks like it should be slotted into the latter about line 41.
Doing that ==> Build successful.

cheers -ben
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