package ftbfs with -flto

[Matthias Klose]

seen at
https://launchpadlibrarian.net/530274998/buildlog_ubuntu-hirsute-ppc64el.powerpc-utils_1.3.8-2ubuntu1_BUILDING.txt.gz

gcc -Wall -g -g -O3 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -Wall -Werror -D_FORTIFY_SOURCE=2 -fstack-protector-all -fwrapv -fPIE -Wstack-protector --param=ssp-buffer-size=1 -Wl,-Bsymbolic-functions -flto=auto -Wl,-z,relro -o src/rtas_event_decode src/rtas_event_decode.o src/common/pseries_platform.o -lrtasevent -lrtasevent -lrtas -lz
gcc -Wall -g -g -O3 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -Wall -Werror -D_FORTIFY_SOURCE=2 -fstack-protector-all -fwrapv -fPIE -Wstack-protector --param=ssp-buffer-size=1 -Wl,-Bsymbolic-functions -flto=auto -Wl,-z,relro -o src/sys_ident src/sys_ident.o src/common/pseries_platform.o -lrtas -lrtasevent -lrtas -lz
lto1: all warnings being treated as errors
make[2]: *** [/tmp/ccqGuyZV.mk:2: /tmp/lparstat.izcmfz.ltrans0.ltrans.o] Error 1
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:832: src/lparstat] Error 1

worked around for now by disabling lto