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Date: Fri, 14 Oct 2011 10:49:38 +0200
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Subject: Problem with PHP as a plugin (C++) using embed sapi
From: olivier@phppro.fr (Olivier Hoareau)

* My use case :

[A] is a main program written in C++
[B] is a C++ "plugin" of [A], compiled in a shared library dynamically =
loaded (dlopen-like functions)
[CX] are a libphpX.so C shared libraries compiled with "--enable-embed", =
where "X" is the PHP version number (5.4, 5.3, ..., 5.0)

User calls [A] with the version of PHP he/she wants to use (ex: 5.4), =
[A] loads [B] using dynamic loading (dlopen-like functions) and =
propagate the requested PHP version number, and when executed, [B] tries =
to load this specific version of [CX] (let's say [C5.4]) using =
dlopen-like functions.

* My status :

[A] is successfully compiled in program "a"
[B] is successfully compiled in shared library in file libb.so
C5.4 is successfully compiled in shared library libphp5.4.so (using =
./configure --disable-all --enable-embed && make)

* My probem :

When trying to load B from A, I got the error "unknown symbol =
executor_globals_id" when calling dlopen("libb.so").
executor_globals seems to be a global variable of libphp5.so (there are =
several other global variables in libphp5.so).
I can't use dlsym() because it is a dlopen() failure.
I tried refactoring my code using PHP functions (in [B]), and I have =
also the same error with other global variables (such as =
php_embed_module, ...)
I tried to define executor_globals_id and it worked, but I felt on next =
global variables error.
I want to be able not to define all PHP global variable in my [B] plugin =
if possible.

* My environment :

MacOSX 10.7 64 bits

* Extra information :

[A] LDFLAGS =3D -flat_namespace -undefined suppress
[B] LDFLAGS =3D -flat_namespace -undefined suppress

dlopen() is used with "RTLD_LAZY | RTLD_GLOBAL"



Do you have an idea on how to reach my use case ?

Thanks !

Olivier Hoareau=