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How to change compilation flags for one file?

If one file must be compiled with special options, you need to explicitly declare an obj target for that file and then use that target in your exe or lib target:

exe a : a.cpp b ;
obj b : b.cpp : <optimization>off ;

Of course you can use other properties, for example to specify specific C/C++ compiler options:

exe a : a.cpp b ;
obj b : b.cpp : <cflags>-g ;

You can also use conditional properties for finer control:

exe a : a.cpp b ;
obj b : b.cpp : <variant>release:<optimization>off ;

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