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[perl #134131] Compilation warnings with clang 9.0.0

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From:
Sergey Aleynikov
Date:
May 23, 2019 09:34
Subject:
[perl #134131] Compilation warnings with clang 9.0.0
Message ID:
rt-4.0.24-14837-1558604047-77.134131-75-0@perl.org
# New Ticket Created by  Sergey Aleynikov 
# Please include the string:  [perl #134131]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=134131 >


This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.41 running under perl 5.31.0.


-----------------------------------------------------------------
[Please describe your issue here]

I get the following warnings when building perl on Debian with clang 9.0.0

Wstring-plus-int:

sv.c:12490:41: warning: adding 'int' to a string does not append to
the string [-Wstring-plus-int]
                 && strnEQ(q + 1, UTF8f + 2, sizeof(UTF8f) - 3))
                    ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
./handy.h:508:37: note: expanded from macro 'strnEQ'
#define strnEQ(s1,s2,l) (strncmp(s1,s2,l) == 0)
                                    ^~
sv.c:12490:41: note: use array indexing to silence this warning
                 && strnEQ(q + 1, UTF8f + 2, sizeof(UTF8f) - 3))
                                        ^
                                  &     [
./handy.h:508:37: note: expanded from macro 'strnEQ'
#define strnEQ(s1,s2,l) (strncmp(s1,s2,l) == 0)
                                    ^
1 warning generated.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.31.0:

Configured by dur-randir at Wed Feb 27 14:51:01 MSK 2019.

Summary of my perl5 (revision 5 version 31 subversion 0) configuration:
  Commit id: 58f4626762668e1c1948832073998af84b2c85d0
  Platform:
    osname=linux
    osvers=4.19.0-5-amd64
    archname=x86_64-linux
    uname='linux dorothy 4.19.0-5-amd64 #1 smp debian 4.19.37-3
(2019-05-15) x86_64 gnulinux '
    config_args='-de -Dusedevel -DDEBUGGING -Dcc=clang-9'
    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='clang-9'
    ccflags ='-DDEBUGGING -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2 -g'
    cppflags='-DDEBUGGING -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='4.2.1 Compatible Clang 9.0.0 (trunk)'
    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='clang-9'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/llvm-9/lib/clang/9.0.0/lib
/usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu
/lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.28.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.28'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl):
  Compile-time options:
    DEBUGGING
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_DEVEL
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under linux
  Compiled at May 23 2019 12:26:06
  %ENV:
    PERLBREW_BASHRC_VERSION="0.78"
    PERLBREW_HOME="/home/afl/.perlbrew"
    PERLBREW_MANPATH="/home/afl/perlbrew/perls/perl-5.20.2/man"
    PERLBREW_PATH="/home/afl/perlbrew/bin:/home/afl/perlbrew/perls/perl-5.20.2/bin"
    PERLBREW_PERL="perl-5.20.2"
    PERLBREW_ROOT="/home/afl/perlbrew"
    PERLBREW_VERSION="0.78"
  @INC:
    lib
    /usr/local/lib/perl5/site_perl/5.31.0/x86_64-linux
    /usr/local/lib/perl5/site_perl/5.31.0
    /usr/local/lib/perl5/5.31.0/x86_64-linux
    /usr/local/lib/perl5/5.31.0


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