libxcb-1.12: optimizations above -O1 causing multiple applications to stop working

Submitted by Jonas Stein

Assigned to xcb mailing list dummy

Link to original bug (#104769)

Description

initially reported on Gentoo https://bugs.gentoo.org/616402

Problem: TeamViewer 12 and Adobe acroread 9.x and probably other closed source applications do not start anymore

Workaround: compile with CFLAGS="-march=native -O1 -pipe"

Compiler used: gcc-6.4.0

Version: 1.12