# BEGIN: Deliberate -O3 workarounds
kde-frameworks/kactivities-stats /-O3/-O2 # causes systemsettings5 to crash
mail-filter/procmail /-O3/-O2 # Causes compile to hang indefinitely
media-libs/faad2 *FLAGS+=-fno-tree-loop-vectorize # causes subtly wrong decoding
media-libs/lcms /-O3/-O2 # Test failure
net-misc/dhcp /-O3/-O2 # Runtime failure, DHCPDISCOVER doesn't work correctly - introduced with gcc 10?
sci-libs/scotch /-O3/-O2 # Test failure
sys-apps/systemd /-O3/-O2 # causes homectl to fail with protocol error
kde-apps/cantor /-O3/-O2 # Build fails with error
# END: Deliberate -O3 workarounds

# BEGIN: -Ofast workarounds
app-editors/emacs *FLAGS+='-fno-finite-math-only' # explicitly required by the ebuild
dev-lang/python *FLAGS+='-fno-finite-math-only' # instrumentation tests hang/segfault during emerge
dev-lang/R *FLAGS+='-fno-finite-math-only' # R itself compiles fine, but runtime errors cause installation of R library tools to fail during emerge
dev-python/numpy /-Ofast/'-O3 ${SAFER_FAST_MATH}' /-ffast-math/'${SAFER_FAST_MATH}' /-funsafe-math-optimizations/'${SAFER_UNSAFE_MATH_OPTS}' *FLAGS-='-ffinite-math-only' # no compilation error, but -funsafe-math-optimizations (implied by -Ofast or -ffast-math) causes an undefined symbol error when trying to import numpy in python; '-ffinite-math-only' causes incorrect runtime handling of infinite values
dev-python/pillow *FLAGS+='-fno-finite-math-only' # compiles fine but causes `import matplotlib.pyplot` to fail with `undefined symbol: __log_finite`
dev-qt/qtcore *FLAGS+='-fno-finite-math-only' # compiles fine but causes most forms of scrolling to stop working in okular
dev-scheme/guile *FLAGS+='-fno-finite-math-only' # build fails with `floating point exception`
gui-apps/gammastep *FLAGS+='-fno-finite-math-only' # compiles fine but -ffinite-math-only causes a runtime error where the brightness values are interpreted incorrectly
kde-frameworks/kjs /-Ofast/'-O3 ${SAFER_FAST_MATH}' /-ffast-math/'${SAFER_FAST_MATH}' # preprocessor in the source throws an error if ffast-math is enabled
<media-libs/opus-1.3.1-r1 /-Ofast/'-O3 ${SAFER_FAST_MATH}' /-ffast-math/'${SAFER_FAST_MATH}' # preprocessor in the source throws an error if ffast-math is enabled
media-sound/mumble /-Ofast/'-O3 ${SAFER_FAST_MATH}' /-ffast-math/'${SAFER_FAST_MATH}' # preprocessor in the libopus source throws an error if ffast-math is enabled
media-video/mpv /-Ofast/'-O3 ${SAFEST_FAST_MATH}' /-ffast-math/'${SAFEST_FAST_MATH}' # causes incorrect behavior (black screen) when enabling interpolation or downscaling
net-analyzer/rrdtool *FLAGS+='-fno-finite-math-only' # configure fails due to non-compliant IEEE arithmetic
net-libs/nodejs *FLAGS+='-fno-finite-math-only' # compiles fine but `npm` returns error whenever it starts running
>=sys-apps/coreutils-8.31 *FLAGS+='-fno-finite-math-only' # causes multiple definition of `minus_zero` error during linking
>=sys-apps/groff-1.22.4 *FLAGS+='-fsigned-zeros' # causes conflicting declaration of `signbit` compilation error
>=sys-devel/llvm-10.0.0 *FLAGS+='-fno-finite-math-only' # compiles fine but causes clang to fail to emerge with ``undefined reference to `__log10_finite'``
>=sys-libs/glibc-2.30 /-Ofast/'-O3 ${SAFEST_FAST_MATH}' /-ffast-math/'${SAFEST_FAST_MATH}' # preprocessor in the source throws an error if ffast-math is enabled
www-client/firefox /-Ofast/'-O3 ${SAFEST_FAST_MATH}' /-ffast-math/'${SAFEST_FAST_MATH}' # won't build with flags activated by -ffast-math on Clang, requires investigation
x11-misc/redshift *FLAGS+='-fno-finite-math-only' # compiles fine but -ffinite-math-only causes a runtime error where the brightness values are interpreted incorrectly
# END: -Ofast workarounds