32bit linux binary illegal instruction crash

[MagaTailor]

The official beta2 binary crashes on my 32bit athlon xp processor.

Program received signal SIGILL, Illegal instruction.
0xb58fb410 in llvm::sys::MemoryFence() () from ../lib/librustc_llvm-4e7c5e5c.so
(gdb) bt
#0  0xb58fb410 in llvm::sys::MemoryFence() ()
   from ../lib/librustc_llvm-4e7c5e5c.so
#1  0xb58bc145 in llvm::PassRegistry::getPassRegistry() ()
   from ../lib/librustc_llvm-4e7c5e5c.so
#2  0xb58bb1ac in llvm::PassNameParser::PassNameParser() ()
   from ../lib/librustc_llvm-4e7c5e5c.so
#3  0xb589f23c in llvm::cl::list<llvm::PassInfo const*, bool, llvm::PassNameParser>::list<char [13], llvm::cl::desc, llvm::cl::OptionHidden>(char const (&) [13], llvm::cl::desc const&, llvm::cl::OptionHidden const&) ()
   from ../lib/librustc_llvm-4e7c5e5c.so
#4  0xb58a930e in _GLOBAL__sub_I_LegacyPassManager.cpp ()
   from ../lib/librustc_llvm-4e7c5e5c.so
#5  0xb7fec9ee in call_init.part () from /lib/ld-linux.so.2
#6  0xb7fecae4 in _dl_init () from /lib/ld-linux.so.2
#7  0xb7fddd5f in _dl_start_user () from /lib/ld-linux.so.2

[MagaTailor]

Btw, if this crash is caused by cross compiling on a 64bit machine leaving all SSE instruction sets on, you've just created a circular dependency in the 32bit build process (i.e. it won't be possible to build rust from source which requires a working rustc binary)

[nagisa]

rust-lang/cargo#958 related. Especially relevant is this comment.

[nagisa]

It might be nice to have builds for absolute baseline architecture (8086-ish with 8087?) so one could run rust on ancient hardware. Not sure whether LLVM even supports that, though.

[MagaTailor]

It seems it's possible to run rustc/cargo using qemu-i386 userspace translation.
Even though qemu-i386 prints 'unsupported syscall 355' and rustc tends to crash with a segfault it happens right after finishing compilation so in spite of the error the output is ready.

[MagaTailor]

I was able to create a fully working stable rustc/cargo build for the generic i686 architecture.

It can be downloaded from here:
https://www.dropbox.com/s/1sguenpkvjmg6z2/rust-1.3.0-i686_generic-linux.tar.bz2?dl=0

and the 20151002 nightly from here:

https://www.dropbox.com/s/7zl2whf1t9mbhh1/rust-1.5.0-i686_generic_linux.tar.bz2?dl=0

while a generic i686 stage0 snapshot from here:

https://www.dropbox.com/s/a2txw5iafxyz2eo/stage0-i686_generic-2015-08-11.tar.bz2?dl=0