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Actually, what you are actually doing is probably a better option. Getting strings through varying shell quoting rules is asking for trouble.

And that leads to another option:

in Makefile.PL:

if($Config{nvsize} == 8) { $nvbits = 64 } elsif(length(sqrt 2) > 25) { $nvbits = 128 } else { $nvbits = 80 } $defines .= ' -DLU_NV_BITS='.$nvbits;

in XS code:

#if LU_NV_BITS == 64 #define MY_FORMAT "%.17" #elif LU_NV_BITS == 80 #define MY_FORMAT "%.21" #elif LU_NV_BITS == 128 #define MY_FORMAT "%.36" #else #error "LU_NV_BITS not set" #endif

Passing a numeric parameter through the shell does not require quoting at all.

You could also just pass the number of digits you want, but converting that back to a string in the C preprocessor requires macro tricks documented in the GNU CPP manual.

In reply to Re^4: Defining an XS symbol in the Makefile.PL by jcb
in thread Defining an XS symbol in the Makefile.PL by syphilis

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