Nope, that doesn't make differences go away, seeing as I was using SP 5.30.2 downloaded and installed less than a week ago. That's newer than 5.26, yet the output was different that the perl built gcc on Unbuntu on WSL on the same machine. The SP build does have -D__USE_MINGW_ANSI_STDIO

Strawberry Perl 5.30.2 on Windows: 

>perl -e"CORE::say $^X"
C:\progs\sp5302x64\perl\bin\perl.exe

>perl -v | find "This is"
This is perl 5, version 30, subversion 2 (v5.30.2) built for MSWin32-x
+64-multi-thread

>perl -V:nvsize
nvsize='8';

>perl -V:ccflags
ccflags=' -s -O2 -DWIN32 -DWIN64 -DCONSERVATIVE -D__USE_MINGW_ANSI_STD
+IO -DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SY
+S -DUSE_PERLIO -fwrapv -fno-strict-aliasing -mms-bitfields';

>perl -e"CORE::say sprintf '%.20g', 0.1"
0.10000000000000000555

[download]

Self-built Perl 5.30.2 on Ubuntu 18.04 LTS on WSL on Windows: 

$ uname -a
Linux tribble 4.4.0-18362-Microsoft #476-Microsoft Fri Nov 01 16:53:00
+ PST 2019 x86_64 x86_64 x86_64 GNU/Linux

$ perl -v | grep 'This is'
This is perl 5, version 30, subversion 2 (v5.30.2) built for x86_64-li
+nux-thread-multi

$ perl -V:nvsize
nvsize='8';

$ perl -e'CORE::say sprintf "%.20g", 0.1'
0.10000000000000001

[download]

In reply to Re^8: Windows / Linux puzzler by ikegami
in thread Windows / Linux puzzler by lbrandewie

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