Configuring perl such that HAS_STRTOD is not defined

syphilis has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

Whenever I build a modern perl on Linux, the symbol HAS_STRTOD (in the C source) is defined, as also is $Config{d_strtod}.
Is there a command line option that I can provide to "sh Configure" that will set HAS_STRTOD (and therefore also $Config{d_strtod}) to undef ?

Cheers,
Rob

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Re: Configuring perl such that HAS_STRTOD is not defined by haukex (Archbishop) on Jul 11, 2018 at 09:45 UTC
This worked for me: `$ git checkout v5.28.0 $ git clean -dxf $ sh Configure -des -U d_strtod $ grep -E '^d_strtod\b' config.sh d_strtod='undef' $ grep -E '#define.+HAS_STRTOD\b' config.h /#define HAS_STRTOD / / $ make $ ./perl -Ilib -MConfig -le 'print $Config{d_strtod}//"undef"' undef` [download] Another method is to patch `config.sh` (I've assumed you don't want `d_strtod_l` either): `$ sh Configure -des $ perl -i.bak -pe "s/^d_strtod(?:_l)?=\K.$/'undef'/" config.sh $ sh Configure -S $ make # etc.` [download]	[reply] [d/l] [select]
Re^2: Configuring perl such that HAS_STRTOD is not defined by syphilis (Archbishop) on Jul 11, 2018 at 10:58 UTC
sh Configure -des -U d_strtod Thanks - that works for me, too!! I removed the space after the "-U" and ran it as `sh Configure -des -Ud_strtod` With or without that space apparently makes no difference. Odd that it hadn't worked for choroba when he tried it. Cheers, Rob	[reply] [d/l]
Re^3: Configuring perl such that HAS_STRTOD is not defined by choroba (Cardinal) on Jul 11, 2018 at 11:14 UTC
Probably because of the missing `-Ilib` headdesk It works now on a different machine, let me try again on the original one once I get to it. ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]
Re: Configuring perl such that HAS_STRTOD is not defined by choroba (Cardinal) on Jul 11, 2018 at 01:09 UTC
I have no idea. Tried with `-UHAS_STRTOD -Ud_strtod -A undef:HAS_STRTOD -A undef:d_strtod` [download] but it still gives `./perl -MConfig -wE 'say $Config{d_strtod}' define` [download] ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]
Re^2: Configuring perl such that HAS_STRTOD is not defined by syphilis (Archbishop) on Jul 11, 2018 at 02:48 UTC
-UHAS_STRTOD -Ud_strtod -A undef:HAS_STRTOD -A undef:d_strtod I tried the first of those shortly after posting. I figured it was a punt worth trying - which it would have been, had it worked ;-) Thanks for trying out those other arguments, too. I'm thinking it might require an alteration to Config_h.SH, which is a generated file that ships with the source. However, I don't know how to correctly implement the required changes. Anyway, my main interest is in ascertaining whether it can be achieved by providing appropriate args to "sh Configure". I'll ask about it on the perl porters mailing list if nothing turns up here. Cheers, Rob	[reply]

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