# New Ticket Created by Hugo van der Sanden # Please include the string: [perl #134189] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org/Ticket/Display.html?id=134189 > This is a bug report for perl from hv@crypt.org, generated with the help of perlbug 1.41 running under perl 5.31.1. ----------------------------------------------------------------- [Please describe your issue here] On this new computer with a freshly installed Ubuntu (bionic), I tried to build blead with clang and threads support, which fell over at the linking stage missing references such as pthread_get_specific() and some maths functions. Tracking back, I found during configure that it had: Checking for optional libraries... What libraries to use? [none] I then found that I hadn't actually installed gcc on this machine, so the /usr/bin/cc link was also pointing at clang. After installing gcc (which updated the /usr/bin/cc link), retrying the clang build successfully found: What libraries to use? [-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc] .. to create the perl below. Not sure if the fault here lies with me, perl or clang. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=core severity=low --- Site configuration information for perl 5.31.1: Configured by hv at Mon Jun 10 15:27:56 BST 2019. Summary of my perl5 (revision 5 version 31 subversion 1) configuration: Commit id: 7948efd4698ec5639b8de124f836d9d3064798cb Platform: osname=linux osvers=4.18.0-21-generic archname=x86_64-linux-thread-multi uname='linux zen2 4.18.0-21-generic #22~18.04.1-ubuntu smp thu may 16 15:07:19 utc 2019 x86_64 x86_64 x86_64 gnulinux ' config_args='-des -Dcc=clang -Dprefix=/opt/scratch -Doptimize=-g -O3 -Dusethread -Duseithreads -DDEBUGGING -Dusedevel -Uversiononly' hint=recommended useposix=true d_sigaction=define useithreads=define usemultiplicity=define use64bitint=define use64bitall=define uselongdouble=undef usemymalloc=n default_inc_excludes_dot=define bincompat5005=undef Compiler: cc='clang' ccflags ='-D_REENTRANT -D_GNU_SOURCE -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='-g -O3' cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include' ccversion='' gccversion='4.2.1 Compatible Clang 6.0.0 (tags/RELEASE_600/final)' 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' ldflags =' -fstack-protector-strong -L/usr/local/lib' libpth=/usr/local/lib /usr/lib/llvm-6.0/lib/clang/6.0.0/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-2.27.so so=so useshrplib=false libperl=libperl.a gnulibc_version='2.27' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=so d_dlsymun=undef ccdlflags='-Wl,-E' cccdlflags='-fPIC' lddlflags='-shared -g -O3 -L/usr/local/lib -fstack-protector-strong' --- @INC for perl 5.31.1: lib /opt/scratch/lib/perl5/site_perl/5.31.1/x86_64-linux-thread-multi /opt/scratch/lib/perl5/site_perl/5.31.1 /opt/scratch/lib/perl5/5.31.1/x86_64-linux-thread-multi /opt/scratch/lib/perl5/5.31.1 /opt/scratch/lib/perl5/site_perl/5.28.1 /opt/scratch/lib/perl5/site_perl --- Environment for perl 5.31.1: HOME=/home/hv LANG=C LANGUAGE=en_GB:en LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/home/hv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin PERL_BADLANG (unset) SHELL=/bin/bashThread Previous