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From Steve Hay <steve.m....@googlemail.com>
Subject Re: Trunk: APR.so won't load
Date Thu, 09 Apr 2015 13:29:44 GMT
Sorry for the slow reply.

I cannot reproduce the problem here on Windows. Your example module
loads up fine with all the "use APR" lines uncommented.

The build system (and the means by which APR::* should be loadable
without mod_perl.so being loaded) is different on Windows, but I did
notice this:

ap_strchr seems to only be used in xs\Apache2\Module\Apache2__Module.h
but when I run Module.c through the preprocessor I find that ap_strchr
gets changed to strchr, and the latter is simply imported from the C
run-time library.

I guess that's down to this code in httpd.h:

#ifdef AP_DEBUG

#undef strchr
# define strchr(s, c)  ap_strchr(s,c)
#undef strrchr
# define strrchr(s, c) ap_strrchr(s,c)
#undef strstr
# define strstr(s, c)  ap_strstr(s,c)

#else

/** use this instead of strchr */
# define ap_strchr(s, c)     strchr(s, c)
/** use this instead of strchr */
# define ap_strchr_c(s, c)   strchr(s, c)
/** use this instead of strrchr */
# define ap_strrchr(s, c)    strrchr(s, c)
/** use this instead of strrchr */
# define ap_strrchr_c(s, c)  strrchr(s, c)
/** use this instead of strrstr*/
# define ap_strstr(s, c)     strstr(s, c)
/** use this instead of strrstr*/
# define ap_strstr_c(s, c)   strstr(s, c)

#endif

so presumably I do not have AP_DEBUG defined for my build (even though
it was a debug build).

It looks like AP_DEBUG should not be defined, even in maintainer mode,
according to an old Changes entry:

remove -DAP_HAVE_DESIGNATED_INITIALIZER and -DAP_DEBUG from
MP_MAINTAINER mode to avoid collisions [Joe Orton]

but do you somehow have AP_DEBUG defined somewhere, which causes the
replacement of ap_strchr with strchr to not happen for you?


On 27 March 2015 at 09:14, Jie Gao <J.Gao@sydney.edu.au> wrote:
> Hi All
>
> I had some more time looking into this, and here's some info I can provide.
>
> --------------------------------------------------------------------------
>
> # readelf -a /usr/local/lib/perl5/site_perl/5.20.2/x86_64-linux-thread-multi/auto/APR/APR.so
> ELF Header:
>   Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
>   Class:                             ELF64
>   Data:                              2's complement, little endian
>   Version:                           1 (current)
>   OS/ABI:                            UNIX - System V
>   ABI Version:                       0
>   Type:                              DYN (Shared object file)
>   Machine:                           Advanced Micro Devices X86-64
>   Version:                           0x1
>   Entry point address:               0x1cb0
>   Start of program headers:          64 (bytes into file)
>   Start of section headers:          15480 (bytes into file)
>   Flags:                             0x0
>   Size of this header:               64 (bytes)
>   Size of program headers:           56 (bytes)
>   Number of program headers:         6
>   Size of section headers:           64 (bytes)
>   Number of section headers:         29
>   Section header string table index: 26
>
> Section Headers:
>   [Nr] Name              Type             Address           Offset
>        Size              EntSize          Flags  Link  Info  Align
>   [ 0]                   NULL             0000000000000000  00000000
>        0000000000000000  0000000000000000           0     0     0
>
> [ Lines removed for clarity ]
>
> Dynamic section at offset 0x36f8 contains 27 entries:
>   Tag        Type                         Name/Value
>  0x0000000000000001 (NEEDED)             Shared library: [libaprutil-1.so.0]
>  0x0000000000000001 (NEEDED)             Shared library: [libexpat.so.1]
>  0x0000000000000001 (NEEDED)             Shared library: [libapr-1.so.0]
>  0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
>  0x0000000000000001 (NEEDED)             Shared library: [libcrypt.so.1]
>  0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
>  0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
>  0x000000000000000f (RPATH)              Library rpath: [/usr/local/httpd-2.4.12/lib:/lib/../lib64]
>
> [ Lines removed for clarity ]
>
> Relocation section '.rela.plt' at offset 0x1300 contains 61 entries:
>   Offset          Info           Type           Sym. Value    Sym. Name + Addend
> 000000203930  000200000007 R_X86_64_JUMP_SLO 0000000000000000 Perl_mg_get + 0
> 000000203938  000300000007 R_X86_64_JUMP_SLO 0000000000000000 Perl_sv_setiv + 0
> 000000203940  000400000007 R_X86_64_JUMP_SLO 0000000000000000 Perl_sv_bless + 0
> 000000203948  000500000007 R_X86_64_JUMP_SLO 0000000000000000 apr_strerror + 0
> 000000203950  000600000007 R_X86_64_JUMP_SLO 0000000000000000 Perl_require_pv + 0
> 000000203958  000700000007 R_X86_64_JUMP_SLO 0000000000000000 Perl_warn + 0
> 000000203960  000800000007 R_X86_64_JUMP_SLO 0000000000000000 PerlIO_printf + 0
> 000000203968  000900000007 R_X86_64_JUMP_SLO 0000000000000000 ap_strchr + 0
>
> [ Lines removed for clarity ]
>
> Symbol table '.dynsym' contains 86 entries:
>    Num:    Value          Size Type    Bind   Vis      Ndx Name
>      0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
>      1: 00000000000018b8     0 SECTION LOCAL  DEFAULT    9
>      2: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND Perl_mg_get
>      3: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND Perl_sv_setiv
>      4: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND Perl_sv_bless
>      5: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND apr_strerror
>      6: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND Perl_require_pv
>      7: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND Perl_warn
>      8: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND PerlIO_printf
>      9: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND ap_strchr
>
>
> [ Lines removed for clarity ]
>
> Symbol table '.symtab' contains 143 entries:
>    Num:    Value          Size Type    Bind   Vis      Ndx Name
>      0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
>      1: 0000000000000190     0 SECTION LOCAL  DEFAULT    1
>
> [ Lines removed for clarity ]
>
>     69: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND ap_strchr
>
>
> [ Lines removed for clarity ]
>
> --------------------------------------------------------------------------
>
> It seems that ap_strchr is not defined anywhere outside httpd, and not in
> any of the shared libs. This seems to create the problem when building
> a module with mod_perl or outside the mod_perl source.
>
> I find a somewhat related change by Stas in the past in the Changes file:
>
> bug reports generating code: [Stas]
> - add (apr|apu)-config linking info
> - show the full path to the config file used to get the data for the
>   report
>
> The APR and APR::* family of modules can now be used without having
> to load mod_perl.so. On *nix, this is done by compiling the needed
> functions from the appropriate sources used to build mod_perl.so
> into APR.so, and then arranging for APR::* to 'use APR ()'. On Win32,
> a static library of needed functions is built, and APR/APR::*
> then link into this library [Stas, Joe Schaefer, Randy Kobes]
>
>
> I hope this helps resolve this issue in any way.
>
>
>
>
>
> Regards,
>
> Jie
>
> * Jie Gao <J.Gao@sydney.edu.au> wrote:
>
>> Date: Sun, 1 Mar 2015 17:30:45 +1100
>> From: Jie Gao <J.Gao@sydney.edu.au>
>> To: "modperl@perl.apache.org" <modperl@perl.apache.org>, mod_perl Dev
>>  <dev@perl.apache.org>
>> Subject: Trunk: APR.so won't load
>> User-Agent: Mutt/1.5.21 (2010-09-15)
>>
>> I have got the source code from the trunk, "make test" mostly passed except for
>> a threading issue, but I installed it anyway.
>>
>> Tried to load a test module, but it fails with the following error:
>>
>> #     Error:  Can't load '/usr/local/lib/perl5/site_perl/5.20.2/x86_64-linux-thread-multi/auto/APR/APR.so'
for module APR: /usr/local/lib/perl5/site_perl/5.20.2/x86_64-linux-thread-multi/auto/APR/APR.so:
undefined symbol: ap_strchr at /usr/local/lib/perl5/5.20.2/x86_64-linux-thread-multi/DynaLoader.pm
line 193.
>> #  at /usr/local/lib/perl5/site_perl/5.20.2/x86_64-linux-thread-multi/APR/Table.pm
line 23.
>>
>> The following test module loads OK, but fails if I uncomment any of the "use APR::*"
lines:
>>
>> #-------------------------------------------------------------------------
>>
>> package mytest::mytestmodule;
>>
>> use 5.010001;
>> use strict;
>> use warnings;
>> use Carp;
>> $SIG{__DIE__} = \&Carp::confess;
>>
>> use mod_perl2;
>> use Apache2::Connection();
>> use Apache2::RequestRec();
>> use Apache2::SubRequest();
>> use Apache2::Access();
>> use Apache2::RequestUtil();
>> use Apache2::Response();
>> use Apache2::Log();
>> use Apache2::Util();
>> use Apache2::Const ("-compile", qw(:common :methods :satisfy :auth MODE_READBYTES));
>> use Apache2::URI();
>> use Apache2::Filter ();
>> #use APR::Const ("-compile", qw(:common SUCCESS BLOCK_READ));
>> use IO::Socket qw(SOCK_STREAM);
>> use Data::Dumper;
>> use AnyDBM_File ();
>> #use APR::Brigade ();
>> #use APR::Bucket ();
>> #use APR::Base64 ();
>> #use APR::Table ();
>> #use APR::URI ();
>> use URI::Escape::XS qw/uri_escape uri_unescape/;
>> #use Apache2::MPM();
>>
>> our $VERSION = '1.0.1';
>>
>> 1;
>> __END__
>>
>> #-------------------------------------------------------------------------
>>
>> -------------8<---------- Start Bug Report ------------8<----------
>> 1. Problem Description:
>>
>>   [DESCRIBE THE PROBLEM HERE]
>>
>> 2. Used Components and their Configuration:
>>
>> *** mod_perl version 2.000009
>>
>> *** using /usr/local/src/mod_perl-2.0/lib/Apache2/BuildConfig.pm
>>
>> *** Makefile.PL options:
>>   MP_APR_CONFIG  => /usr/local/httpd-2.4.12/bin/apr-1-config
>>   MP_APR_LIB     => aprext
>>   MP_APXS        => /usr/local/httpd-2.4.12/bin/apxs
>>   MP_COMPAT_1X   => 1
>>   MP_GENERATE_XS => 1
>>   MP_LIBNAME     => mod_perl
>>   MP_USE_DSO     => 1
>>
>>
>> *** /usr/local/httpd-2.4.12/bin/httpd -V
>> Server version: Apache/2.4.12 (Unix)
>> Server built:   Feb 27 2015 20:05:23
>> Server's Module Magic Number: 20120211:41
>> Server loaded:  APR 1.5.1, APR-UTIL 1.5.4
>> Compiled using: APR 1.5.1, APR-UTIL 1.5.4
>> Architecture:   64-bit
>> Server MPM:     worker
>>   threaded:     yes (fixed thread count)
>>     forked:     yes (variable process count)
>> Server compiled with....
>>  -D APR_HAS_SENDFILE
>>  -D APR_HAS_MMAP
>>  -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
>>  -D APR_USE_SYSVSEM_SERIALIZE
>>  -D APR_USE_PTHREAD_SERIALIZE
>>  -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
>>  -D APR_HAS_OTHER_CHILD
>>  -D AP_HAVE_RELIABLE_PIPED_LOGS
>>  -D DYNAMIC_MODULE_LIMIT=256
>>  -D HTTPD_ROOT="/usr/local/httpd-2.4.12"
>>  -D SUEXEC_BIN="/usr/local/httpd-2.4.12/bin/suexec"
>>
>>
>> *** /usr/bin/ldd /usr/local/httpd-2.4.12/bin/httpd
>>         linux-vdso.so.1 =>  (0x00007fffcefff000)
>>         libpcre.so.0 => /lib64/libpcre.so.0 (0x000000327f400000)
>>         libaprutil-1.so.0 => /usr/local/httpd-2.4.12/lib/libaprutil-1.so.0 (0x00007f3ba864c000)
>>         libexpat.so.1 => /lib64/libexpat.so.1 (0x0000003281c00000)
>>         libapr-1.so.0 => /usr/local/httpd-2.4.12/lib/libapr-1.so.0 (0x00007f3ba8417000)
>>         librt.so.1 => /lib64/librt.so.1 (0x000000327dc00000)
>>         libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00000036c2400000)
>>         libpthread.so.0 => /lib64/libpthread.so.0 (0x000000327d400000)
>>         libc.so.6 => /lib64/libc.so.6 (0x000000327d000000)
>>         /lib64/ld-linux-x86-64.so.2 (0x000000327cc00000)
>>         libfreebl3.so => /lib64/libfreebl3.so (0x00000036c2800000)
>>         libdl.so.2 => /lib64/libdl.so.2 (0x000000327d800000)
>>
>>
>> *** (apr|apu)-config linking info
>>
>>  -L/usr/local/httpd-2.4.12/lib -laprutil-1     -lexpat
>>  -L/usr/local/httpd-2.4.12/lib -lapr-1 -lrt -lcrypt  -lpthread
>>
>>
>>
>> *** /usr/local/bin/perl -V
>> Summary of my perl5 (revision 5 version 20 subversion 2) configuration:
>>
>>   Platform:
>>     osname=linux, osvers=2.6.32-504.8.1.el6.x86_64, archname=x86_64-linux-thread-multi
>>     uname='linux xxx.xxx.xxx.xx 2.6.32-504.8.1.el6.x86_64 #1 smp fri dec 19 12:09:25
est 2014 x86_64 x86_64 x86_64 gnulinux '
>>     config_args='-Dusethreads -Dprefix=/usr/local -des -A ccflags=-fPIC'
>>     hint=recommended, useposix=true, d_sigaction=define
>>     useithreads=define, usemultiplicity=define
>>     use64bitint=define, use64bitall=define, uselongdouble=undef
>>     usemymalloc=n, bincompat5005=undef
>>   Compiler:
>>     cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fPIC -fwrapv -fno-strict-aliasing
-pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
>>     optimize='-O2',
>>     cppflags='-D_REENTRANT -D_GNU_SOURCE -fPIC -fwrapv -fno-strict-aliasing -pipe
-fstack-protector -I/usr/local/include'
>>     ccversion='', gccversion='4.4.7 20120313 (Red Hat 4.4.7-11)', 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 /usr/lib /lib/../lib64 /usr/lib/../lib64 /lib /lib64 /usr/lib64
/usr/local/lib64
>>     libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
>>     perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
>>     libc=libc-2.12.so, 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'
>>
>>
>> Characteristics of this binary (from libperl):
>>   Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
>>                         PERL_DONT_CREATE_GVSV
>>                         PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
>>                         PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
>>                         PERL_NEW_COPY_ON_WRITE PERL_PRESERVE_IVUV
>>                         USE_64_BIT_ALL USE_64_BIT_INT USE_ITHREADS
>>                         USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE
>>                         USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_PERLIO
>>                         USE_PERL_ATOF USE_REENTRANT_API
>>   Built under linux
>>   Compiled at Feb 25 2015 15:58:55
>>   %ENV:
>>     PERL_LWP_USE_HTTP_10="1"
>>   @INC:
>>     /usr/local/lib/perl5/site_perl/5.20.2/x86_64-linux-thread-multi
>>     /usr/local/lib/perl5/site_perl/5.20.2
>>     /usr/local/lib/perl5/5.20.2/x86_64-linux-thread-multi
>>     /usr/local/lib/perl5/5.20.2
>>     /usr/local/lib/perl5/site_perl/5.18.2
>>     /usr/local/lib/perl5/site_perl/5.18.0
>>     /usr/local/lib/perl5/site_perl
>>     .
>>
>> *** Packages of interest status:
>>
>> Apache2            : -
>> Apache2::Request   : -
>> CGI                : 3.65
>> ExtUtils::MakeMaker: 6.98
>> LWP                : 5.837
>> mod_perl           : -
>> mod_perl2          : 2.000009
>>
>>
>> 3. This is the core dump trace: (if you get a core dump):
>>
>>   [CORE TRACE COMES HERE]
>>
>> This report was generated by bin/mp2bug on Sun Mar  1 06:21:21 2015 GMT.
>>
>> -------------8<---------- End Bug Report --------------8<----------
>>
>> # ls -al /usr/local/httpd-2.4.12/lib/
>> total 4108
>> drwxr-xr-x.  4 root root    4096 Feb 27 20:07 .
>> drwxr-xr-x. 15 root root    4096 Feb 27 20:07 ..
>> -rw-r--r--.  1 root root    9262 Feb 27 20:07 apr.exp
>> drwxr-xr-x.  2 root root    4096 Feb 27 20:07 apr-util-1
>> -rw-r--r--.  1 root root    5272 Feb 27 20:07 aprutil.exp
>> -rw-r--r--.  1 root root 1685642 Feb 27 20:07 libapr-1.a
>> -rwxr-xr-x.  1 root root     969 Feb 27 20:07 libapr-1.la
>> lrwxrwxrwx.  1 root root      17 Feb 27 20:07 libapr-1.so -> libapr-1.so.0.5.1
>> lrwxrwxrwx.  1 root root      17 Feb 27 20:07 libapr-1.so.0 -> libapr-1.so.0.5.1
>> -rwxr-xr-x.  1 root root  858051 Feb 27 20:07 libapr-1.so.0.5.1
>> -rw-r--r--.  1 root root 1022024 Feb 27 20:07 libaprutil-1.a
>> -rwxr-xr-x.  1 root root    1045 Feb 27 20:07 libaprutil-1.la
>> lrwxrwxrwx.  1 root root      21 Feb 27 20:07 libaprutil-1.so -> libaprutil-1.so.0.5.4
>> lrwxrwxrwx.  1 root root      21 Feb 27 20:07 libaprutil-1.so.0 -> libaprutil-1.so.0.5.4
>> -rwxr-xr-x.  1 root root  589222 Feb 27 20:07 libaprutil-1.so.0.5.4
>> drwxr-xr-x.  2 root root    4096 Feb 27 20:07 pkgconfig
>>
>>
>>
>>
>>
>>
>> Regards,
>>
>>
>> Jie.
>>
>>
>>

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