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(ld.info)Constants

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Constants
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   All constants are integers.

   As in C, the linker considers an integer beginning with `0' to be
octal, and an integer beginning with `0x' or `0X' to be hexadecimal.
The linker considers other integers to be decimal.

   In addition, you can use the suffixes `K' and `M' to scale a
constant by `1024' or `1024*1024' respectively. For example, the
following all refer to the same quantity:
       _fourk_1 = 4K;
       _fourk_2 = 4096;
       _fourk_3 = 0x1000;