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Postings from June 2019
sisyphus <sisyphus359@gmail.com> writes: > On Wed, Jun 12, 2019 at 10:41 PM Dagfinn Ilmari Mannsåker <ilmari@ilmari.org> > wrote: > >> sisyphus <sisyphus359@gmail.com> writes: >> >> > Hi, >> > Is it possible to build perl 5.30.0 such that "perl -V" output does NOT >> > specify "USE_PERL_ATOF" ? >> > >> > If not, then the obvious question is "Why do we bother specifying it ?" >> >> Looking at the comments and code in perl.h, you can disable it by >> passing -Accflags=-DUSE_PERL_ATOF=0 to Configure. > > Thanks. > I've tested, and I can verify that does remove "USE_PERL_ATOF" from the > "perl -V" output. > > But does configuring perl-5.30.0 with the "-Accflags=-DUSE_PERL_ATOF=0" > argument alter perl's functionality in any way ? Looking at the code and comments in perl.h again (https://github.com/perl/perl5/blob/maint-5.30/perl.h#L2353-L2378), the difference is that it uses the system atof() function instead of the perl-provided one: #ifdef USE_PERL_ATOF # define Perl_atof(s) Perl_my_atof(s) # define Perl_atof2(s, n) Perl_my_atof3(aTHX_ (s), &(n), 0) #else # define Perl_atof(s) (NV)atof(s) # define Perl_atof2(s, n) ((n) = atof(s)) #endif #define my_atof2(a,b) my_atof3(a,b,0) - ilmari -- "A disappointingly low fraction of the human race is, at any given time, on fire." - Stig Sandbeck MathisenThread Previous | Thread Next