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+SHELL = /bin/bash
+
+# c++ compiler flags that are used for all targets:
+# they make binaries faster and smaller
+# -s : strips the binary
+# -O3 : optimizes the binary
+# -Ofast : optimizes the binary
+# -march=native : optimizes the binary for the current CPU
+# -flto : link time optimization
+CFLAGS = -Ofast -march=native -flto -s