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Report information
Id: 132750
Status: resolved
Priority: 0/
Queue: perl5

Owner: Nobody
Requestors: randir <sergey.aleynikov [at]>

Operating System: (no value)
PatchStatus: (no value)
Severity: High
Type: core
Perl Version: 5.27.7
Fixed In: (no value)

Subject: Uninitialized variable usage
Date: Mon, 22 Jan 2018 03:42:35 +0300
From: Sergey Aleynikov <sergey.aleynikov [...]>
To: perlbug [...]
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This is a bug report for perl from, generated with the help of perlbug 1.41 running under perl 5.27.7. ----------------------------------------------------------------- [Please describe your issue here] Recent commit ba52ce15fe5ca68de1be69e394f41ccb48a731cc (HEAD) Author: Karl Williamson <> Date: Tue Dec 19 16:03:39 2017 -0700 Deprecate above \xFF in bitwise string ops introduced the following build warning which hints at an uninitialized variable usage: doop.c:1105:18: warning: variable 'len' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] else if (right_utf8) { ^~~~~~~~~~ doop.c:1119:15: note: uninitialized use occurs here lensave = len; ^~~ doop.c:1105:14: note: remove the 'if' if its condition is always true else if (right_utf8) { ^~~~~~~~~~~~~~~~ doop.c:1021:15: note: initialize the variable 'len' to silence this warning STRLEN len; ^ = 0 [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=core severity=high --- Site configuration information for perl 5.27.7: Configured by dur-randir at Fri Dec 1 17:01:46 MSK 2017. Summary of my perl5 (revision 5 version 27 subversion 7) configuration: Commit id: 3c67ad9b9e6d659feb76f3acfc9f81cfe59e3660 Platform: osname=darwin osvers=13.4.0 archname=darwin-2level uname='darwin isengard.local 13.4.0 darwin kernel version 13.4.0: mon jan 11 18:17:34 pst 2016; root:xnu-2422.115.15~1release_x86_64 x86_64 ' config_args='-de -Dusedevel -DDEBUGGING' hint=recommended useposix=true d_sigaction=define useithreads=undef usemultiplicity=undef use64bitint=define use64bitall=define uselongdouble=undef usemymalloc=n default_inc_excludes_dot=define bincompat5005=undef Compiler: cc='cc' ccflags ='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9 -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -DPERL_USE_SAFE_PUTENV' optimize='-O3 -g' cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9 -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='' gccversion='4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)' gccosandvers='' intsize=4 longsize=8 ptrsize=8 doublesize=8 byteorder=12345678 doublekind=3 d_longlong=define longlongsize=8 d_longdbl=define longdblsize=16 longdblkind=3 ivtype='long' ivsize=8 nvtype='double' nvsize=8 Off_t='off_t' lseeksize=8 alignbytes=8 prototype=define Linker and Libraries: ld='cc' ldflags =' -mmacosx-version-min=10.9 -fstack-protector -L/usr/local/lib' libpth=/Applications/ /Applications/ /Applications/ /usr/local/lib /usr/lib libs=-lpthread -lgdbm -ldbm -ldl -lm -lutil -lc perllibs=-lpthread -ldl -lm -lutil -lc libc= so=dylib useshrplib=false libperl=libperl.a gnulibc_version='' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=bundle d_dlsymun=undef ccdlflags=' ' cccdlflags=' ' lddlflags=' -mmacosx-version-min=10.9 -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector' --- @INC for perl 5.27.7: lib /usr/local/lib/perl5/site_perl/5.27.7/darwin-2level /usr/local/lib/perl5/site_perl/5.27.7 /usr/local/lib/perl5/5.27.7/darwin-2level /usr/local/lib/perl5/5.27.7 --- Environment for perl 5.27.7: DYLD_LIBRARY_PATH (unset) HOME=/Users/dur-randir LANG=en_US.UTF-8 LANGUAGE (unset) LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin PERLBREW_BASHRC_VERSION=0.78 PERLBREW_HOME=/Users/dur-randir/.perlbrew PERLBREW_MANPATH=/Users/dur-randir/perlbrew/perls/perl-5.22.1/man PERLBREW_PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin PERLBREW_PERL=perl-5.22.1 PERLBREW_ROOT=/Users/dur-randir/perlbrew PERLBREW_VERSION=0.78 PERL_BADLANG (unset) SHELL=/usr/local/bin/zsh
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Fixed by commit b404a7f5880f54fb0673d325408618ab43074309 Author: Karl Williamson <> Date: Sun Jan 21 17:55:23 2018 -0700 PATCH: [perl #132750] Silence uninit warning I inspected the code, and there is no problem here; it's a compiler mistake. Nevertheless, smply initializing the variable silences it. -- Karl Williamson

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