The way to minimize the C++ binary file compiled by arm g++

1. CFLAGS += -Os
   It means optimize for space.

2. CFLAGS += -ffunction-sections -fdata-sections
   It means save the function and data to its own sections.

3. LFLAGS += –gc-sections
   It means enable garbage collection for unused sections.

4. -fno-rtti -fno-exceptions
   Disable the RTTI and exception of cpp.

5. LFLAGS += –specs=nano.specs
   Use libc_nano.a libstdc++_nano.a instead of libc.a libstdc++.a
   But this one will lead to error and currently no perfect solution was found.

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reference:

http://www.stmcu.org/module/forum/thread-603791-1-1.html