Re: [Mesa3d-users] undefined symbol in egl/egl_x11_swrast.so and init problems

[Andreas P. <and...@gm...>]

Hi,
Its me again,

2010/3/12 Chia-I Wu <ol...@gm...>:
> On Fri, Mar 12, 2010 at 6:02 AM, Andreas Pokorny
> <and...@gm...> wrote:
>> 2010/3/11 Chia-I Wu <ol...@gm...>:
>>> On Thu, Mar 11, 2010 at 10:06 PM, Andreas Pokorny
>>> <and...@gm...> wrote:
>>>> I work on: b8656c4825b9e054f05258773ba012e41d4fcdee
>>>> I have two rather strange problems using egl. I have implemented a
>>>> egl/es2/libX11 based renderer shared object file. The shared object
>>>> file gets loaded and initialized using dlopen/dlsym. Then when the
>>>> renderer is supposed to initialize EGL, and to create a window I run
>>>> into runtime symbol lookup errors.
>>>> ./Startup: symbol lookup error: /usr/local/lib/egl/egl_x11_swrast.so:
>>>> undefined symbol: _eglInitDriverFallbacks
>>> It seems _eglInitDriverFallbacks in libEGL.so is not resolved when
>>> egl_x11_swrast.so is loaded.  I am not quite sure about your setup (who dlopen
>>> who?).  Do you have a sample code that reproduces your setup or the issue?
>> My applicatin dlopens a shared object files that links against EGL and
>> ES2. I was just writing a sample code that turns progs/es2/xegl/tri.c
>> into a shared library. Then I dlopen the lib with
>> dlopen(RTLD_LAZY|RTLD_LOCAL);  - and then i try to execute an exported
>> function of tri.c (turned main into a function with visibility
>> default) as it seems RTLD_LOCAL causes the issue. I have to use
>> RTLD_GLOBAL instead.  So now it works.
>> I have no idea why i used RTLD_LOCAL in the first place.
>
> Glad you solved your problem.  dlopen()ing is one of the part in EGL that I
> haven't looked at.  I don't have enough experiences on various setups or Unixes
> to say that EGL is doing the right thing.

According to git bisect the fix of chaning RTLD_LOCAL to RTLD_GLOBAL
causes a crash in a different es2/egl implementation.

What is bad about explicitly linking to libEGL.so in the egl driver?
>From my limited point of view it work without breaking anything.

kind regards
Andreas