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where are apache symbols?

Hi!

I'm trying to build phc and I find that in the configuration process, there's an error when checking for something about zend strings.... because of missing symbols (related to apache). I hacked the configure script just to see what happened and it finished successfully... however, when I try to compile phc, I get the same problem with apache symbols:

Code:

/bin/bash ./libtool --tag=CXX   --mode=link g++ -Wextra -Wno-unused-parameter -Wno-write-strings -Wno-deprecated -g -O2 -export-dynamic  -o src/phc phc.o -lgc -lgccpp -lltdl -lboost_regex-mt libphc.la -lxerces-c  -lgccpp -lgc -lphp5 -L/usr/local/php/lib -ldl -lboost_regex

chmod 755 src/phc_compile_plugin

libtool: link: g++ -Wextra -Wno-unused-parameter -Wno-write-strings -Wno-deprecated -g -O2 -o src/.libs/phc phc.o -Wl,--export-dynamic  /usr/lib/i386-linux-gnu/libltdl.so -lboost_regex-mt ./.libs/libphc.so -L/usr/lib -L/usr/local/php/lib /usr/lib/libxerces-c.so -lnsl -lpthread -lgccpp -lgc -lphp5 -ldl -lboost_regex -Wl,-rpath -Wl,/usr/local/phc/lib

/usr/local/php/lib/libphp5.so: undefined reference to `ap_get_server_version'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_sub_req_lookup_uri'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_pass_brigade'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_bucket_eos_create'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_loaded_modules'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pool_cleanup_null'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_rflush'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_add_common_vars'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_log_error'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_update_mtime'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_set_content_length'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_run_sub_req'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pool_userdata_get'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_add_version_component'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pool_userdata_set'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_palloc'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_brigade_flatten'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pstrdup'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_mpm_query'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_server_root_relative'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_hook_child_init'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_server_root'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_brigade_create'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_table_elts'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_snprintf'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_log_rerror'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_auth_type'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_add_cgi_vars'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_hook_pre_config'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_table_set'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_table_unset'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_brigade_cleanup'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_set_content_type'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pool_cleanup_register'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_hook_post_config'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_pool_cleanup_run'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_psprintf'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_hook_handler'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_table_add'

/usr/local/php/lib/libphp5.so: undefined reference to `apr_table_get'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_set_last_modified'

/usr/local/php/lib/libphp5.so: undefined reference to `unixd_config'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_get_brigade'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_destroy_sub_req'

/usr/local/php/lib/libphp5.so: undefined reference to `ap_rwrite'

collect2: ld returned 1 exit status

make[2]: *** [src/phc] Error 1

make[2]: Leaving directory `/home/antoranz/Descargas/php/phc/phc-0.3.0.1'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/home/antoranz/Descargas/php/phc/phc-0.3.0.1'

make: *** [all] Error 2

Where are those symbols defined? Thanks in advance.

Fairly interesting... the symbols are in libphp5 from the php5.2 I installed:

Code:

$ nm -gC /usr/local/php/lib/libphp5.so  | grep " apr"

         U apr_brigade_cleanup

         U apr_brigade_create

         U apr_brigade_flatten

         U apr_bucket_eos_create

         U apr_palloc

         U apr_pool_cleanup_null

         U apr_pool_cleanup_register

         U apr_pool_cleanup_run

         U apr_pool_userdata_get

         U apr_pool_userdata_set

         U apr_psprintf

         U apr_pstrdup

         U apr_snprintf

         U apr_table_add

         U apr_table_elts

         U apr_table_get

         U apr_table_set

         U apr_table_unset

Then why the hell can't the linker see it? Hell!

Oh.... I see it.... U is for 'undefined'... so they must be defined somwehere else, ain't that right?

I just checked all so files in my box and there are no symbols with those names anywhere.... what's the trick then?

Reading this article shed some light on what's going on: http://blog.flameeyes.eu/2010/09/you...efined-symbols

So in phc's configure I'm defining those symbols as undefinded:

Code:

LDFLAGS="-u ap_hook_child_init -u apr_table_elts -u apr_table_unset -u apr_pool_cleanup_register -u ap_rflush -u ap_pass_brigade -u apr_brigade_create -u ap_sub_req_lookup_uri -u ap_server_root -u apr_pool_cleanup_null -u ap_destroy_sub_req -u ap_mpm_query -u ap_add_cgi_vars -u ap_set_last_modified -u ap_set_content_length -u ap_hook_post_config -u ap_get_server_version -u apr_pool_userdata_get -u ap_hook_handler -u ap_rwrite -u apr_psprintf -u apr_palloc -u apr_brigade_cleanup -u unixd_config -u apr_snprintf -u ap_get_brigade -u ap_add_common_vars -u apr_table_add -u apr_bucket_eos_create -u ap_add_version_component -u ap_log_error -u ap_hook_pre_config -u apr_pool_userdata_set -u apr_pool_cleanup_run -u apr_pstrdup -u ap_set_content_type -u apr_table_get -u ap_run_sub_req -u ap_loaded_modules -u ap_server_root_relative -u apr_table_set -u ap_update_mtime -u apr_brigade_flatten -u ap_log_rerror -u ap_auth_type" ./configure --with-php=/usr/local/php --prefix=/usr/local/phc

I'm facing a problem of another kind so when I finish compiling (or it fails), I'll let you know.

Compilation was successful... but then it wasn't going to give itself away so easily, would it?

Code:

$ /usr/local/phc/bin/phc -c Hello.php -o hello-world

/usr/local/phc/bin/phc: symbol lookup error: /usr/local/php/lib/libphp5.so: undefined symbol: apr_pool_cleanup_null

So.... what can I try next?

I think I almost nailed... though without the apache symbols.

The thing is that in order to build phc, I'll have to use php _without_ apache module support. But then, in order to build my phc-compiled shared library as a php module, I'll have to use php _with_ apache.... so how about having two separate compilations of PHP? One with apache and one without?

I just tried. I compiled phc against php without apache and it works fine. Then I compiled the c code generated against php with apache. Then, I modified php.ini to include this extension, then I restarted apache, I saw this in error.log

Code:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/php/lib/php/extensions/no-debug-zts-20060613/helloworld.so' - /usr/local/php/lib/php/extensions/no-debug-zts-20060613/helloworld.so: undefined symbol: compiler_globals in Unknown on line 0

What am I missing now?

Now, this is very interesting. I built and enabled the module in php full (meaning, with apache support).

When I ask php for information about this module it says the module can¿t be loaded because __MAIN__ is not defined.

Code:

$ /usr/local/php/bin/php --re helloworld

PHP Warning:  Internal error: Cannot find extension function __MAIN__ in global function table in Unknown on line 0

Extension [ <persistent> extension #24 helloworld version 1.0 ] {



  - Functions {

  }

}

There are some __MAIN__ symbols in the so:

Code:

$ nm -gC modules/helloworld.so | grep MAIN

00004180 B helloworld___MAIN___arg_info

000010b0 T zif___MAIN__

What did I miss now?

This is very interesting.... I built a tiny extension following this example: http://devzone.zend.com/303/extensio...-php-and-zend/

Look at the symbols in the file:

Code:

$ nm -gC modules/hello.so

         w _Jv_RegisterClasses

000020c8 A __bss_start

         w __cxa_finalize@@GLIBC_2.1.3

         w __gmon_start__

000020c8 A _edata

000020d0 A _end

         U _estrndup

00000588 T _fini

000003a4 T _init

00000530 T get_module

00002040 D hello_module_entry

000004e0 T zif_hello_world

So... there's no __MAIN__ stuff or something like that... I thought that was kind of mandatory.... and that makes me think that probably the code generated by phc has a problem... what a crash course.