Probably a bad CL, but just in case.

These are the CLs.  It could be one in chromiumos-overlay.

stdio [stdout]
CHUMP | chromeos-admin | rbaddo | 297955
chromiumos-overlay | deepak.sharma-AT-amd.com | 381852 | fails:3
chromiumos-overlay | sabin.floares-AT-intel.com | 392066 | fails:2
hostap | nmasti | 395597 | fails:2
chromeos-overlay | hungte | *297415 | fails:1
vboot_reference | dnojiri | 399594 | fails:1
adhd | chinyue | 398942
chromiumos-overlay | rsorokin | 394667
chromiumos-overlay | wisley.chen-AT-quantatw.com | 398660
chromiumos-overlay | wisley.chen-AT-quantatw.com | 398680
chromiumos-overlay | ljusten | 398779
chromiumos-overlay | wisley.chen-AT-quantatw.com | 398859
coreboot | pgeorgi | 398759
coreboot | pgeorgi | 398760
depthcharge | wisley.chen-AT-quantatw.com | 398879
dev-util | pgeorgi | 393746
dev-util | pgeorgi | 393747
factory | youcheng | 394472
minigbm | gurchetansingh | 392549
minigbm | gurchetansingh | 398424
minigbm | gurchetansingh | 398425
minigbm | gurchetansingh | 399924
overlay-caroline-private | ryan.lin-AT-intel.com | *297835
overlay-pyro-private | Kevin.Chiu-AT-quantatw.com | *297757
vboot_reference | dnojiri | 399593



 llvm-3.8.1-r2: [134/134] Linking CXX executable bin/llvm-tblgen
llvm-3.8.1-r2: [303/1124] cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-attrs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR/Attributes.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR/Attributes.inc.tmp
llvm-3.8.1-r2: [304/1124] cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-intrinsic -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR/Intrinsics.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR/Intrinsics.gen.tmp
llvm-3.8.1-r2: [305/1124] cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-attrs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/IR/AttributesCompatFunc.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/IR/AttributesCompatFunc.inc.tmp
llvm-3.8.1-r2: [306/1124] cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/LibDriver && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-opt-parser-defs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/LibDriver -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/LibDriver/Options.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/LibDriver/Options.inc.tmp
llvm-3.8.1-r2: FAILED: cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-attrs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR/Attributes.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR/Attributes.inc.tmp
llvm-3.8.1-r2: /bin/sh: /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen: cannot execute binary file: Exec format error
llvm-3.8.1-r2: FAILED: cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-intrinsic -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include/llvm/IR/Intrinsics.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/include/llvm/IR/Intrinsics.gen.tmp
llvm-3.8.1-r2: /bin/sh: /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen: cannot execute binary file: Exec format error
llvm-3.8.1-r2: FAILED: cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/LibDriver && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-opt-parser-defs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/LibDriver -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/LibDriver/Options.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/LibDriver/Options.inc.tmp
llvm-3.8.1-r2: /bin/sh: /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen: cannot execute binary file: Exec format error
llvm-3.8.1-r2: FAILED: cd /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/IR && /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen -gen-attrs -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/IR -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/Target -I /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/include /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src/lib/IR/AttributesCompatFunc.td -o /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/lib/IR/AttributesCompatFunc.inc.tmp
llvm-3.8.1-r2: /bin/sh: /build/smaug/tmp/portage/sys-devel/llvm-3.8.1-r2/work/llvm-3.8.1.src-.default/NATIVE/bin/llvm-tblgen: cannot execute binary file: Exec format error
llvm-3.8.1-r2: ninja: build stopped: subcommand failed.
llvm-3.8.1-r2:  * ERROR: sys-devel/llvm-3.8.1-r2::chromiumos failed (compile phase):
llvm-3.8.1-r2:  *   (no error message)