[Mesa-dev] [Bug 109659] Missing OpenGL symbols in OSMesa Gallium when building with meson

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109659

            Bug ID: 109659
           Summary: Missing OpenGL symbols in OSMesa Gallium when building
                    with meson
           Product: Mesa
           Version: 18.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/OSMesa
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: pierre.guillou at lip6.fr
        QA Contact: mesa-dev at lists.freedesktop.org

Building OSMesa Gallium with meson leads to missing exported OpenGL symbols in
libOSMesa.so compared to using the autotools/configure script.

Use case/context: ParaView in-situ analysis and rendering
(https://blog.kitware.com/messing-with-mesa-for-paraview-5-0vtk-7-0/)

When using meson to build OSMesa from Mesa 18.3:

$ meson [sourcedir] -Dosmesa=gallium
$ ninja

I noticed that libOSMesa.so does not export OpenGL symbols:

$ nm -D src/gallium/targets/osmesa/libOSMesa.so | grep " T "
000000000006cbe0 T OSMesaColorClamp
000000000006c6a0 T OSMesaCreateContext
000000000006c1a0 T OSMesaCreateContextAttribs
000000000006c620 T OSMesaCreateContextExt
000000000006cc60 T OSMesaDestroyContext
000000000006c0a0 T OSMesaGetColorBuffer
000000000006c0f0 T OSMesaGetCurrentContext
000000000006cf50 T OSMesaGetDepthBuffer
000000000006c6c0 T OSMesaGetIntegerv
000000000006cb70 T OSMesaGetProcAddress
000000000006c7d0 T OSMesaMakeCurrent
000000000006cc00 T OSMesaPixelStore
000000000006cee0 T OSMesaPostprocess

However, using the autotools/configure script (Mesa 18.3):

$ [sourcedir]/autogen.sh --enable-gallium-osmesa
or, from release tarball
$ [sourcedir]/configure --enable-gallium-osmesa
$ make

the generated library exports the whole OpenGL API:

$ nm -D lib/gallium/libOSMesa.so | grep " T "
0000000000558f80 T glAccum
000000000055e300 T glActiveShaderProgram
[...]
000000000055ae40 T glWindowPos3sv
000000000055ae40 T glWindowPos3svARB
0000000000557200 T OSMesaColorClamp
00000000005569d0 T OSMesaCreateContext
00000000005564d0 T OSMesaCreateContextAttribs
0000000000556950 T OSMesaCreateContextExt
0000000000557280 T OSMesaDestroyContext
00000000005563d0 T OSMesaGetColorBuffer
0000000000556420 T OSMesaGetCurrentContext
0000000000556ea0 T OSMesaGetDepthBuffer
00000000005569f0 T OSMesaGetIntegerv
0000000000557190 T OSMesaGetProcAddress
0000000000556b00 T OSMesaMakeCurrent
0000000000557220 T OSMesaPixelStore
00000000005572b0 T OSMesaPostprocess

This behavior has been witnessed on up-to-date ArchLinux and Ubuntu 18.04.

Assuming this is a bug in the Meson build script, one quick fix would be to
edit src/gallium/targets/osmesa/meson.build and move libglapi_static from the
link_with section to the link_whole section in the osmesa library declaration:

diff --git a/src/gallium/targets/osmesa/meson.build
b/src/gallium/targets/osmesa/meson.build
index b4ae8f4b6ec..e873e311aa0 100644
--- a/src/gallium/targets/osmesa/meson.build
+++ b/src/gallium/targets/osmesa/meson.build
@@ -43,9 +43,9 @@ libosmesa = shared_library(
     inc_gallium_drivers,
   ],
   link_depends : osmesa_link_deps,
-  link_whole : [libosmesa_st],
+  link_whole : [libosmesa_st, libglapi_static],
   link_with : [
-    libmesa_gallium, libgallium, libglapi_static, libws_null,
osmesa_link_with,
+    libmesa_gallium, libgallium, libws_null, osmesa_link_with,
   ],
   dependencies : [
     dep_selinux, dep_thread, dep_clock, dep_unwind,

However, being quite new at building Mesa and maybe missing the big picture,
I'm not sure
* if what I'm describing here is really a bug, or is intentional and
* if there is some unforeseen consequences of the aforementioned quick fix.

Is there a more appropriate way to use OpenGL through OSMesa?

Similar to: https://bugs.freedesktop.org/show_bug.cgi?id=94489

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