[sdcc-devel] How to optimize global variable ram usage across multiple .c files

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Hi,
    I am using SDCC4.2.0 for a pic18 like single-chip-processor, but I found that the SDCC can not distinguish the global variable define in one file , but it was not used at all.
    The compiler still allocated RAM location for this kind global variable.
    SDCC cannnot do across .c file  analysis. How to do with this situation??





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