Description
Module: POSIX
Description
ext/POSIX/t/math.t includes an assertion about signbit(NAN), and it fails while I'm trying to build v5.38.0:
ext/POSIX/t/math ................................................. # Failed test 'signbit(NAN)'
# at t/math.t line 296.
# Looks like you failed 1 test of 151.
It's this assertion:
ok(!signbit(NAN), "signbit(NAN)");The assertion fails on my Solaris x86 system. The underlying C signbit function exhibits the same behavior.
#include <stdio.h>
#include <math.h>
int main(void) {
printf("NaN sign bit: %d\n", signbit(NAN));
return 0;
}That prints NaN sign bit: 1. (On my Solaris Sparc system, and on my RHEL x86_64 host, it reports "0" instead, and Perl's signbit test passes.)
Steps to Reproduce
./Configure -Dcc=/bin/cc -des -Dusethreads -Duseshrplib=false -Dnoextensions=ODBM_File
make
make test TEST_FILES=../ext/POSIX/t/math.tExpected behavior
This particular assertion shouldn't be present. POSIX does not specify the precise value of NAN. Although NAN values may have sign bits, they do not have signs, per se, so it's wrong to assert that the value of NAN's sign bit should have any particular value.
This is somewhat related to issue #18473, and especially to PR #18590, where the failing assertion was added.
Perl configuration
Summary of my perl5 (revision 5 version 38 subversion 0) configuration:
Commit id: 76298ae68aa7796f0ffc05095b127d23f4b2de8f
Platform:
osname=solaris
osvers=2.10
archname=i86pc-solaris-thread-multi
uname='sunos solx8610u11 5.10 generic_147148-26 i86pc i386 i86pc '
config_args='-Dcc=/bin/cc -des -Dusethreads -Duseshrplib=false -Dnoextensions=ODBM_File'
hint=recommended
useposix=true
d_sigaction=define
useithreads=define
usemultiplicity=define
use64bitint=undef
use64bitall=undef
uselongdouble=undef
usemymalloc=n
default_inc_excludes_dot=define
Compiler:
cc='/bin/cc'
ccflags ='-D_REENTRANT -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
optimize='-O'
cppflags='-D_REENTRANT'
ccversion='Studio 12.6 Sun C 5.15 SunOS_i386 2017/05/30'
gccversion=''
gccosandvers=''
intsize=4
longsize=4
ptrsize=4
doublesize=8
byteorder=1234
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=12
longdblkind=3
ivtype='long'
ivsize=4
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=4
prototype=define
Linker and Libraries:
ld='/bin/cc'
ldflags =' -L/usr/lib -L/usr/ccs/lib -L/opt/developerstudio12.6/lib/compilers/sse2 -L/opt/developerstudio12.6/lib/compilers -L/lib '
libpth=/usr/lib /usr/ccs/lib /opt/developerstudio12.6/lib/compilers/sse2 /opt/developerstudio12.6/lib/compilers /lib
libs=-lpthread -lsocket -lnsl -ldl -lm -lc
perllibs=-lpthread -lsocket -lnsl -ldl -lm -lc
libc=/lib/libc.so
so=so
useshrplib=false
libperl=libperl.a
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags=' '
cccdlflags='-KPIC'
lddlflags='-G -L/usr/lib -L/usr/ccs/lib -L/opt/developerstudio12.6/lib/compilers/sse2 -L/opt/developerstudio12.6/lib/compilers -L/lib'
Characteristics of this binary (from libperl):
Compile-time options:
HAS_LONG_DOUBLE
HAS_STRTOLD
HAS_TIMES
MULTIPLICITY
PERLIO_LAYERS
PERL_COPY_ON_WRITE
PERL_DONT_CREATE_GVSV
PERL_HASH_FUNC_ZAPHOD32
PERL_HASH_USE_SBOX32
PERL_MALLOC_WRAP
PERL_OP_PARENT
PERL_PRESERVE_IVUV
PERL_USE_SAFE_PUTENV
USE_ITHREADS
USE_LARGE_FILES
USE_LOCALE
USE_LOCALE_COLLATE
USE_LOCALE_CTYPE
USE_LOCALE_NUMERIC
USE_LOCALE_TIME
USE_PERLIO
USE_PERL_ATOF
USE_REENTRANT_API
Built under solaris
Compiled at Sep 28 2023 14:42:16
@INC:
lib
/opt/lib/perl5/site_perl/5.38.0/i86pc-solaris-thread-multi
/opt/lib/perl5/site_perl/5.38.0
/opt/lib/perl5/5.38.0/i86pc-solaris-thread-multi
/opt/lib/perl5/5.38.0