tce-load -i compiletc

cd smartmontools-6.5

CC="gcc -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" ./configure --prefix=/usr/local --disable-static --localstatedir=/var

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make
sudo make install

smartmontools-6.5 configuration:
host operating system:  i486-pc-linux-gnu
C++ compiler:           g++ -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe
C compiler:             gcc -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe
preprocessor flags:     
C++ compiler flags:     -g -O2 -Wall -W
C compiler flags:       -g -O2
linker flags:           
OS specific modules:    os_linux.o cciss.o dev_areca.o  
binary install path:    /usr/local/sbin
man page install path:  /usr/local/share/man
doc file install path:  /usr/local/share/doc/smartmontools
examples install path:  /usr/local/share/doc/smartmontools/examplescripts
drive database file:    /usr/local/share/smartmontools/drivedb.h
database update script: /usr/local/sbin/update-smart-drivedb
download tools:         curl wget lynx svn
local drive database:   /usr/local/etc/smart_drivedb.h
smartd config file:     /usr/local/etc/smartd.conf
smartd warning script:  /usr/local/etc/smartd_warning.sh
smartd plugin path:     /usr/local/etc/smartd_warning.d
smartd initd script:    /usr/local/etc/init.d/smartd.initd
smartd save files:      [disabled]
smartd attribute logs:  [disabled]
libcap-ng support:      no
SELinux support:        no
NVMe DEVICESCAN:        no