gtk libool slow on arm

Why is the gtk libtool so slow on arm? A typical command such as:



libtool: link: cc -o .libs/testentrycompletion -pthread -O2 -pipe -g -Wall
-Wl,-rpath-link -Wl,/usr/X11R6/lib -Wl,-rpath-link -Wl,/usr/X11R6/lib
testentrycompletion.o -L.libs -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0
-lgobject-2.0 -lglib-2.0 -liconv -lpcre -lintl -lffi -lc++abi -lgthread-2.0
-lfribidi -lm -lcairo -lpthread -lpixman-1 -lfontconfig -lfreetype -lz
-lexpat -lpng -lxcb-shm -lxcb -lxcb-render -lXrender -lX11 -lXext
-lpangoft2-1.0 -lharfbuzz -lgraphite2 -lgdk_pixbuf-2.0 -lgmodule-2.0
-lgio-2.0 -lcairo-gobject -lXinerama -lXi -lXrandr -lXcursor -lXfixes
-lXcomposite -lXdamage -lepoxy -latk-1.0 -latk-bridge-2.0 -ldbus-1 -latspi
-Wl,-rpath-link,/usr/local/lib,-rpath-link,/usr/X11R6/lib



takes from 15 to 20 minutes on arm. It is all cpu time, not i/o:



load averages: 2.03, 2.02, 2.00 op1bsdsnap.graf.lan
16:26:21

78 processes: 1 running, 76 idle, 1 on processor up 4 days,
7:42

CPU states: 99.6% user, 0.0% nice, 0.4% system, 0.0% interrupt, 0.0%
idle

Memory: Real: 59M/234M act/tot Free: 259M Cache: 98M Swap: 11M/516M



PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND

12051 root 64 0 7680K 8532K run - 6:44 99.12% ld

27209 sysadmin 2 0 972K 984K idle select 0:49 0.00% sshd

65728 _pflogd 4 0 716K 172K sleep bpf 0:29 0.00% pflogd



I set up an i386 virtual system with one cpu at 3 GHz and the whole gtk
build including all the dependencies took a few hours. My gtk build on an
arm orangepi with a 1.2GHz cpu has been running for over 48 hours, all due
to libtool. A cc compile finishes in seconds.