meson build with buildtype=release causes g-ir_scanner dies with SIGILL on AMD machine

GIMP version: 2.99

Operating System: Ubuntu 19.10

Package: self built, the problem is in the meson build.

Description of the bug

Building gimp with meson with buildtype=release seems to crash g-ir-scanner (?) and stop the build, whereas buildtype=debug does not.

Reproduction

Is the bug reproducible? Always

Reproduction steps:

    cd /home/gimp
    meson _build \
     --buildtype=release \
     -Djavascript=never \
     -Dlua=never \
     -Dpython=always \
     -Dgtk-doc=false
    cd _build
    ninja
    ninja install

yields:

Command '['/home/gimp/_build/tmp-introspectnrkd9xnk/Gimp-3.0', '--introspect-dump=/home/gimp/_build/tmp-introspectnrkd9xnk/functions.txt,/home/gimp/_build/tmp-introspectnrkd9xnk/dump.xml']' died with <Signals.SIGILL: 4>.

Just preceding that was:

/usr/bin/g-ir-scanner -pthread -I/usr/include/gobject-introspection-1.0 .......

Expected result: build completes

Actual result: build stops

Additional information

The workaround is: don't do that, use buildtype=debug. I know the meson build is experimental.

SIGILL is illegal instruction. Some tool is executing an illegal instruction?

gegl#190 (closed) seems pertinent. Possibly related to SMD instructions invoked when compiler is optimizing?

My hw is an older AMD Phenom.

I am building inside a vagga container, I haven't tested it outside the container.