Linking PHP extension (symbol lookup error)

Question

I cleared up some things in my mind and on my server and want to rewrite my question:

I got two packages from NetManagement, both belonging to nmcryptgate:

• a PHP extension (source code)
• a compiled library (the tar named nmcryptgate_client_1.7.16-i386-unknown-freebsdelf4.2)

I want to install these on my Debian 5.0.8 server.

I (./configure && make && make install)'d the PHP extension succesfully. phpinfo() states that the extension is enabled.

The created files went to

/usr/lib/php5/20060613+lfs/nmcryptgate.la
/usr/lib/php5/20060613+lfs/nmcryptgate.so

I moved the files from the compiled library as following (derived from the structure inside the tar):

/usr/local/bin/nmcryptgate
/usr/local/doc/nmcryptgate/developer.txt (of no help)
/usr/local/include/nmcryptgate.h
/usr/local/lib/libnmcryptgate.so.1
/usr/local/lib/libnmcryptgate.la
/usr/local/lib/libnmcryptgate.so (symlink directing to libnmcryptgate.so.1)

I called following methods after doing so:

ldconfig
libtool --finish

BUT: Whenever calling a method from the extension Apache will come up with this error:

/usr/sbin/apache2: symbol lookup error: /usr/lib/php5/20060613+lfs/nmcryptgate.so: undefined symbol: nmlistalloc

/usr/local/lib is included inside /etc/ld.so.conf.d/libc.conf

/usr/lib/php5/20060613+lfs/nmcryptgate.la reads:

# nmcryptgate.la - a libtool library file
# Generated by ltmain.sh - GNU libtool 1.5.22 (1.1220.2.365 2005/12/18 22:14:06)
#
# Please DO NOT delete this file!
# It is necessary for linking the library.

# The name that we can dlopen(3).  
dlname='nmcryptgate.so'  

# Names of this library.  
library_names='nmcryptgate.so nmcryptgate.so nmcryptgate.so'  

# The name of the static archive.  
old_library=''  

# Libraries that this one depends upon.  
dependency_libs=''  

# Version information for nmcryptgate.  
current=0  
age=0  
revision=0  

# Is this an already installed library?  
installed=yes  

# Should we warn about portability when linking against -modules?  
shouldnotlink=yes  

# Files to dlopen/dlpreopen  
dlopen=''  
dlpreopen=''  

# Directory that this library needs to be installed in:  
libdir='/usr/local/lib'  
#libdir='/usr/lib/php5/20060613+lfs'  

/usr/local/lib/libnmcryptgate.la

# libnmcryptgate.la - a libtool library file
# Generated by ltmain.sh - GNU libtool 1.3.4 (1.385.2.196 1999/12/07 21:47:57)
#
# Please DO NOT delete this file!
# It is necessary for linking the library.

# The name that we can dlopen(3).  
dlname=''  

# Names of this library.  
library_names='libnmcryptgate.so.1 libnmcryptgate.so libnmcryptgate.so'  

# The name of the static archive.  
old_library=''  

# Libraries that this one depends upon.  
dependency_libs=' -L. -L/usr/ssl/lib -L/usr/local/ssl/lib -L/usr/local/lib -lssl -lcrypto'  

# Version information for libnmcryptgate.  
current=1  
age=0  
revision=29  

# Is this an already installed library?  
installed=yes  

# Directory that this library needs to be installed in:  
libdir='/usr/local/lib'  

In my thinking/guessing the whole process should work this way:

1. php encounters a method call handled by the extension
2. the respective extension method is called
3. the extension being just a php wrapper (my guess) calls the underlying binary
4. until x. ... and returning back to php script

I guess that step 3 is the problem here: somehow the extension can't find the underlying binary lib - just a guess.

Am I right on this one? Or what's the prob? Can someone help out on this?

Thanks to all and regards, Christian

PS: I just recompiled it and found an error inside the config.log:

config.log:/usr/bin/ld: h_errno: TLS definition in /lib/libc.so.6 section .tbss mismatches non-TLS reference in /usr/local/lib/libnmcryptgate.so

I included /usr/local/lib/libnmcryptgate.so in the Makefile by appending

DEFAULT_INCLUDES = -include /usr/local/include/nmcryptgate.h

Still the same error ...

Answer 1

You have to add /usr/local/lib to library path. Create /etc/ld.so.conf.d/nmcryptgate.conf with the following content:

/usr/local/lib

Then run:

sudo ldconfig

Test the PHP again. Apache restart might be required.