[tlbuild] problem disabling luajit and luatex

[Mojca Miklavec]

On 26 April 2016 at 02:44, Nelson H. F. Beebe wrote:
>
> The original luajit configuration failure looked like this:
>
>         checking for _FILE_OFFSET_BITS value needed for large files... no
>         checking for _LARGEFILE_SOURCE value needed for large files... no
>         configure: error: Sorry, can not preprocess <lj_arch.h>
>         === configuring in luajit failed
>         Makefile:898: recipe for target 'recurse' failed
>
> The  lj_arch.h file has this block of architecture definitions:
>
>         #define LUAJIT_ARCH_X86         1
>         #define LUAJIT_ARCH_x86         1
>         #define LUAJIT_ARCH_X64         2
>         #define LUAJIT_ARCH_x64         2
>         #define LUAJIT_ARCH_ARM         3
>         #define LUAJIT_ARCH_arm         3
>         #define LUAJIT_ARCH_ARM64       4
>         #define LUAJIT_ARCH_arm64       4
>         #define LUAJIT_ARCH_PPC         5
>         #define LUAJIT_ARCH_ppc         5
>         #define LUAJIT_ARCH_MIPS        6
>         #define LUAJIT_ARCH_mips        6
>
> The IA-64 (Itanium) platform is not among them.  C/C++ compilers on
> that system define the symbols __ia64 and __ia64__.  It is normally
> little-endian, like x86_64, but its register model is very different.
> The lj_arch.h file has symbols that refer to register numbers, which
> would normally be accessible only through __asm__() macros, so I
> expect that it might be nontrivial to add IA-64 support. I do not
> propose to investigate that question further.

In that case we could probably disable luajit on Itanium (to avoid the
need to explicitly disable it on an unsupported architecture).

Mojca