Enable strict aliasing for release builds

.github/workflows/linux.yml

@@ -101,7 +101,10 @@ jobs:
           CXX: ccache g++
           LD: gcc
           RANLIB: gcc-ranlib
-          FLAGS: -O3 -flto -ffunction-sections -fdata-sections -DNDEBUG -pipe
+          FLAGS: >-
+            -O3 -fstrict-aliasing -fno-signed-zeros -fno-trapping-math
+            -fassociative-math -mfpmath=sse -msse4.2 -flto -ffunction-sections
+            -fdata-sections -DNDEBUG -pipe
           LINKFLAGS: -Wl,--as-needed
         run: |
           set -x

.github/workflows/macos.yml

@@ -58,7 +58,7 @@ jobs:
     env:
       CC: ccache clang
       CXX: ccache clang++
-      FLAGS: -O3 -DNDEBUG -pipe -march=nehalem
+      FLAGS: -DNDEBUG -O3 -fno-math-errno -fstrict-aliasing -march=nehalem -flto=thin -pipe
     steps:
       - uses: actions/checkout@v1
       - name: Install C++ compiler and libraries

scripts/automator/build/gcc-defaults

@@ -15,7 +15,7 @@ cflags_debug+=("${cflags[@]}" -g -fno-omit-frame-pointer)
 # Note: associative-math is needed for vectorization of floating point
 #       calculations, which also relies on no-signed-zeros and
 #       no-trapping-math.
-cflags_release+=("${cflags[@]}" -DNDEBUG -O3 -fno-strict-aliasing
+cflags_release+=("${cflags[@]}" -DNDEBUG -O3 -fstrict-aliasing
                  -fno-signed-zeros -fno-trapping-math -fassociative-math
                  -frename-registers -ffunction-sections -fdata-sections)
 cflags_pgotrain+=("${cflags_debug[@]}" -pg -ftree-vectorize)