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With Microblaze Gcc version < 8.x the build hangs due to gcc bug 85180: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. The bug shows up when building opus with optimization but not when building with -O0. To work around this, if BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y we force using -O0. Fixes: http://autobuild.buildroot.net/results/73dc9610a13d6e14eec58d529617210d93d5dec4/ Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com> [Thomas: tweak CFLAGS logic, improve commit log] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>