From @ntyni

This is a bug report for perl from Niko Tyni <ntyni@​debian.org>,
generated with the help of perlbug 1.39 running under perl 5.13.6.

Commit c427f4d in 5.10.1 made sprintf()
ignore LC_NUMERIC with numeric constants.

perl -Mlocale -MPOSIX=locale_h -e 'setlocale(LC_NUMERIC, "fi_FI") or die; printf("%s should be %g\n", sprintf("%g", 2.4), 2.4)'
2.4 should be 2,4

(At least de_DE and sv_SE should also do for the locale.)

The bug is with constant folding, this works​:

perl -Mlocale -MPOSIX=locale_h -e 'setlocale(LC_NUMERIC, "fi_FI") or die; $in = 2.4; printf("%s should be %g\n", sprintf("%g", $in), 2.4)'
2,4 should be 2,4

Proposed patch attached, including a regression test. The test requires
the patches from [perl #78452] to be applied first.

Flags​:
  category=core
  severity=low

Site configuration information for perl 5.13.6​:

Configured by niko at Tue Oct 26 23​:55​:38 EEST 2010.

Summary of my perl5 (revision 5 version 13 subversion 6) configuration​:
  Derived from​: c0507bfdd88c7b40e0351f57671bf37465c9fbdb
  Ancestor​: 07be2ac
  Platform​:
  osname=linux, osvers=2.6.32-5-amd64, archname=x86_64-linux-gnu-thread-multi
  uname='linux madeleine 2.6.32-5-amd64 #1 smp wed oct 20 00​:05​:22 utc 2010 x86_64 gnulinux '
  config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.13 -Darchlib=/usr/lib/perl/5.13 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.13.6 -Dsitearch=/usr/local/lib/perl/5.13.6 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=both -Doptimize=-O0 -Dusedevel -Uuseshrplib -des'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
  optimize='-O0 -g',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
  ccversion='', gccversion='4.4.5', gccosandvers=''
  intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
  libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
  perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
  libc=/lib/libc-2.11.2.so, so=so, useshrplib=false, libperl=libperl.a
  gnulibc_version='2.11.2'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
  cccdlflags='-fPIC', lddlflags='-shared -O0 -g -L/usr/local/lib -fstack-protector'

Locally applied patches​:
 

@​INC for perl 5.13.6​:
  lib
  /usr/local/lib/perl/5.13.6
  /usr/local/share/perl/5.13.6
  /usr/lib/perl5
  /usr/share/perl5
  /usr/lib/perl/5.13
  /usr/share/perl/5.13
  /usr/local/share/perl
  /usr/share/perl5
  .

Environment for perl 5.13.6​:
  HOME=/home/niko
  LANG=en_US.UTF-8
  LANGUAGE (unset)
  LC_CTYPE=fi_FI.UTF-8
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/home/niko/bin​:/home/niko/bin​:/home/niko/bin​:/usr/local/bin​:/usr/bin​:/bin​:/usr/local/games​:/usr/games​:/sbin​:/usr/sbin​:/sbin​:/usr/sbin
  PERL_BADLANG (unset)
  SHELL=/bin/zsh

From @ntyni

From 7e37740c88629b397d90d5fbf7e8b2a66fe1bc16 Mon Sep 17 00:00:00 2001
From: Niko Tyni <ntyni@debian.org>
Date: Wed, 27 Oct 2010 10:56:24 +0300
Subject: [PATCH] Don't fold constants in sprintf() if locales are used

Commit c427f4d2d4575fbc8a5190932fe321136c7597b3 in 5.10.1 made sprintf()
ignore LC_NUMERIC for numeric constants.
---
 op.c           |    1 +
 t/run/locale.t |   15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/op.c b/op.c
index cfa9d6b..615678e 100644
--- a/op.c
+++ b/op.c
@@ -2588,6 +2588,7 @@ S_fold_constants(pTHX_ register OP *o)
     case OP_SLE:
     case OP_SGE:
     case OP_SCMP:
+    case OP_SPRINTF:
 	/* XXX what about the numeric ops? */
 	if (PL_hints & HINT_LOCALE)
 	    goto nope;
diff --git a/t/run/locale.t b/t/run/locale.t
index 483123f..2f7306b 100644
--- a/t/run/locale.t
+++ b/t/run/locale.t
@@ -128,6 +128,19 @@ EOF
 	    "too late to ignore the locale at write() time");
         }
     }
+
+    for ($different) {
+	local $ENV{LC_NUMERIC} = $_;
+	local $ENV{LC_ALL}; # so it never overrides LC_NUMERIC
+	fresh_perl_is(<<'EOF', "$difference "x4, {},
+	    use locale;
+	    use POSIX qw(locale_h);
+	    setlocale(LC_NUMERIC, "");
+	    my $in = 4.2;
+	    printf("%g %g %s %s ", $in, 4.2, sprintf("%g", $in), sprintf("%g", 4.2));
+EOF
+	"sprintf() and printf() look at LC_NUMERIC regardless of constant folding");
+    }
 } # SKIP
 
-sub last { 6 }
+sub last { 7 }
-- 
1.7.2.3

From @cpansprout

On Wed Oct 27 01​:14​:11 2010, ntyni@​debian.org wrote​:

Proposed patch attached, including a regression test. The test
requires
the patches from [perl #78452] to be applied first.

Thank you. Applied as b3fd614.

The RT System itself - Status changed from 'new' to 'open'

@cpansprout - Status changed from 'open' to 'resolved'