Build failed on Linux 32 bit

[Jonathan Gibbons]

I got the following build error on Linux 32 bit; is this a known error?

Rescanned ../generated/adfiles/linux_x86_32.ad  but encountered no changes.
Assembling 
/w/jjg/work/build-infra/jdk8/hotspot/src/os_cpu/linux_x86/vm/linux_x86_32.s
Compiling 
/w/jjg/work/build-infra/jdk8/hotspot/src/share/vm/opto/loopPredicate.cpp
Compiling 
/w/jjg/work/build-infra/jdk8/hotspot/src/share/vm/opto/loopTransform.cpp
Compiling 
/w/jjg/work/build-infra/jdk8/hotspot/src/share/vm/opto/loopUnswitch.cpp
/w/jjg/work/build-infra/jdk8/hotspot/src/os_cpu/linux_x86/vm/linux_x86_32.s:501:26: 
error: token "{" is not valid in preprocessor expressions
/w/jjg/work/build-infra/jdk8/hotspot/src/os_cpu/linux_x86/vm/linux_x86_32.s:501:1: 
error: unterminated #if
make[5]: *** [linux_x86_32.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [the_vm] Error 2
make[3]: *** [product] Error 2
make[2]: *** [generic_build2] Error 2
make[1]: *** [product] Error 2
make: *** [hotspot] Error 2