failed to compile base, buldworld, with -Os CFLAGS

I tried to buildworld with -Os CFLAGS, but it failed.
Here is the compiling log:

--- getcap.So ---
cc -m32 -DCOMPAT_32BIT -march=haswell  -isystem
/usr/obj/usr/src/lib32/usr/include/
-L/usr/obj/usr/src/lib32/usr/lib32  -B/usr/obj/usr/src/lib32/usr/lib32
-fpic -DPIC -g -Os -pipe  -I/usr/src/lib/libc/include
-I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/i386 -DNLS
-D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa
-I/usr/src/lib/libc/../../contrib/libc-vis -DINET6
-I/usr/obj/usr/src/world32/usr/src/lib/libc -I/usr/src/lib/libc/resolv
 -D_ACL_PRIVATE -DPOSIX_MISTAKE -I/usr/src/lib/libc/../libmd
-I/usr/src/lib/libc/../../contrib/jemalloc/include
-I/usr/src/lib/libc/../../contrib/tzcode/stdtime
-I/usr/src/lib/libc/stdtime  -I/usr/src/lib/libc/locale -DBROKEN_DES
-DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP -DNS_CACHING
-DSYMBOL_VERSIONING -MD  -MF.depend.getcap.So -MTgetcap.So -std=gnu99
-fstack-protector-strong -Wsystem-headers -Werror -Wall
-Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body
-Wno-string-plus-int -Wno-unused-const-variable
-Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality
-Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef
-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
-Qunused-arguments -I/usr/src/lib/libutil -I/usr/src/lib/msun/i387
-I/usr/src/lib/msun/x86 -I/usr/src/lib/msun/src -c
/usr/src/lib/libc/gen/getcap.c -o getcap.So
--- getcwd.So ---
--- fnmatch.So ---
cc: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/fnmatch-87dc57.c
(http://slexy.org/view/s2ddVhTTyQ)
cc: note: diagnostic msg: /tmp/fnmatch-87dc57.sh
(http://slexy.org/view/s21zeFmDPU)
cc: note: diagnostic msg:

********************
*** [fnmatch.So] Error code 254

make[4]: stopped in /usr/src/lib/libc


-- 
🌞Eric