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From hack bear <hackingb...@hotmail.com>
Subject RE: mod_perl always segfault on thread creation
Date Thu, 23 Aug 2012 23:38:50 GMT

What exactly is the right way to build a shared-lib perl. I tried to follow the INSTALL instruction
and many variations to get it work but still to no avail. For example I tried

# make clean
# CFLAGS='-m64 -mtune=nocona' ./Configure -Dinstallusrbinperl -Dusethreads -Duseithreads -Duseshrplib
-Dprefix=/usr -es -A ccflags="-fPIC -m64 -mtune=nocona " -A ldflags="-Duseshrplib" -A define:useshrplib
-A define:usethreads -A define:useithreads -A define:installusrbinperl
# make

Only the libperl.a is built
# find . -name 'libperl*'
./libperl.a

And perl -V shows
  ...
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib/../lib64 /usr/lib/../lib64 /lib /usr/lib /lib64 /usr/lib64
/usr/local/lib64
    libs=-lnsl -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.12'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'

And BTW is there any existing RPM for RHEL that is dynamic build already?

> Date: Thu, 23 Aug 2012 09:17:48 +0300
> From: dmn@debian.org
> To: modperl@perl.apache.org
> Subject: Re: mod_perl always segfault on thread creation
> 
> -=| hack bear, 22.08.2012 16:16:33 -0700 |=-
> > 
> > I'm doing a dynamic build (the default setting I believe.) here are the ldd results
(that's how we can tell, right?)
> 
> To me this seems like a static build. Yes, it links dynamicly to 
> system libraries, but the perl library is staticly linked. Compare 
> with ldd output on a stock Debian system below:
> > 
> > # ldd /usr/bin/perl
> >     linux-vdso.so.1 =>  (0x00007ffff2dff000)
> >     libnsl.so.1 => /lib64/libnsl.so.1 (0x00000039c3c00000)
> >     libdl.so.2 => /lib64/libdl.so.2 (0x00000039bec00000)
> >     libm.so.6 => /lib64/libm.so.6 (0x00000039bfc00000)
> >     libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00000039c1800000)
> >     libutil.so.1 => /lib64/libutil.so.1 (0x00000039c4000000)
> >     libpthread.so.0 => /lib64/libpthread.so.0 (0x00000039bf400000)
> >     libc.so.6 => /lib64/libc.so.6 (0x00000039bf000000)
> >     /lib64/ld-linux-x86-64.so.2 (0x00000039be800000)
> >     libfreebl3.so => /lib64/libfreebl3.so (0x00000039c2c00000)
> 
> $ ldd /usr/bin/perl                                                                 
                                                                           ~
>         linux-vdso.so.1 =>  (0x00007fff53dff000)
>         libperl.so.5.14 => /usr/lib/libperl.so.5.14 (0x00007f5e53c1f000)
>         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f5e53a1b000)
>         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f5e53798000)
>         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f5e5357c000)
>         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5e531f5000)
>         libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007f5e52fbd000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007f5e53fca000)
> 
> > # ldd /etc/httpd/modules/mod_perl.so 
> >     linux-vdso.so.1 =>  (0x00007fff33fff000)
> >     libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fbe6ec80000)
> >     libdl.so.2 => /lib64/libdl.so.2 (0x00007fbe6ea7c000)
> >     libm.so.6 => /lib64/libm.so.6 (0x00007fbe6e7f7000)
> >     libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fbe6e5c0000)
> >     libutil.so.1 => /lib64/libutil.so.1 (0x00007fbe6e3bd000)
> >     libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbe6e19f000)
> >     libc.so.6 => /lib64/libc.so.6 (0x00007fbe6de0e000)
> >     /lib64/ld-linux-x86-64.so.2 (0x00000039be800000)
> >     libfreebl3.so => /lib64/libfreebl3.so (0x00007fbe6dbac000)
> 
> $ ldd /usr/lib/apache2/modules/mod_perl.so                                          
                                                                           ~
>         linux-vdso.so.1 =>  (0x00007fffe6bff000)
>         libperl.so.5.14 => /usr/lib/libperl.so.5.14 (0x00007f3bfba7e000)
>         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f3bfb87a000)
>         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3bfb5f7000)
>         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f3bfb3db000)
>         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3bfb054000)
>         libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007f3bfae1c000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007f3bfc065000)
> 
> The difference is in the presence of libperl.so.5.14 in the output.
> 
> Good luck,
>     dam
 		 	   		  
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