Re: How do I use "Long Doubles" in perl?

d_longdbl merely means that Configure probed the C library on the build system and found that the ldexpl() function is present.

uselongdouble means that your perl was configured and built with Configure -Duselongdouble so that the floating point variables perl uses are long double.

Dave.

Comment on Re: How do I use "Long Doubles" in perl?

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Re^2: How do I use "Long Doubles" in perl? by cnd (Acolyte) on May 20, 2018 at 06:38 UTC
Ahh - interesting. Thanks! So d_longdbl is more-or-less a pointless indicator, since the missing "uselongdouble" indicates that even though it existed, it was not incorporated at compile time. Shame. Might have been nice to use - the uncertainty of major breakage dampens my desire to do the rebuild unfortunately... it's on an important business system...	[reply]
Re^3: How do I use "Long Doubles" in perl? by syphilis (Archbishop) on May 20, 2018 at 09:02 UTC
the uncertainty of major breakage dampens my desire to do the rebuild unfortunately I think that such caution is unwarranted. If you do the rebuild with -Duselongdouble and the build still passes its tests, then there is no major breakage. As regards minor breakages (ie errors not picked up by the test suite) - they are just as likely to be present in the "double" builds as in the "long double" builds. Cheers, Rob	[reply]