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__FLT_MAX__ is a pre-defined macro. You'll probably have to look inside the GCC source to see where it is defined, but it's easy to what it is defined to: The C preprocessor normally predefines several macros that indicate what type of system and machine is in use. They are obviously different on each target supported by GCC. This manual, being for ...


Currently (20141102) adding the PPA and invoking the above command apt-get install gcc-4.9 g++-4.9 cpp-4.9 will print out a slew of suggested packages. Install them all except for libvtv0-dbg (which has a dependency conflict): apt-get install gcc-4.9 g++-4.9 cpp-4.9 gcc-4.9-locales g++-4.9-multilib libstdc++6-4.9-dbg gcc-4.9-multilib libgcc1-dbg ...

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