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x86: Add ENDBR at function entries

See merge request !223

H.J. Lu authored Feb 21, 2020 and Matt Turner committed Feb 21, 2020

Intel Control-flow Enforcement Technology (CET):

https://software.intel.com/en-us/articles/intel-sdm

contains shadow stack (SHSTK) and indirect branch tracking (IBT). When
CET is enabled, ELF object files must be marked with .note.gnu.property
section. Also when IBT is enabled, all indirect branch targets must
start with ENDBR instruction which is NOP on non-CET processors.

This fixes:

#202

tests: Remove an include for GL/glxint.h.

See merge request !220

tests: Add _GLOBAL_OFFSET_TABLE_ to PLATFORM_SYMBOLS

See merge request !222

On PA-RISC, the _GLOBAL_OFFSET_TABLE_ symbol is always exposed. See

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob;f=bfd/elf32-hppa.c;h=2e653083ce05a77b3e33c056e2f9a51b327c2b22#l1001
https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=blob;f=sysdeps/hppa/dl-machine.h;h=9e98366ea3b09612d54a3e956d5c35c1bdc86560#l80

Meson: Add datadir and datarootdir variables to libglvnd.pc.

See merge request !221

Add the missing datadir and datarootdir variables to the libglvnd.pc file that
Meson generates.

Fix Meson on armel

See merge request !219

egl: avoid hard-coding the path to `python`

See merge request !216

Use xvfb-run in CI scripts

See merge request !212

GL/glxint.h isn't a standard GLX header, and isn't needed for anything, so just
remove it.

When building for armel, Meson's cpu() and cpu_family() strings aren't always
sufficient.

Instead, try to check for some predefined macros to determine if it's building
for ARMv7 or something older.

Change the CI scripts to use xvfb-run instead of running Xvfb directly.

That avoids a potential race condition, where a test could fail because Xvfb
hasn't started listening for connections yet. xvfb-run will wait for Xvfb to be
ready before it runs any other programs.

That also simplifies error handling, because the CI scripts can just use
"set -e" instead of having to store the exit code, kill Xvfb, and then check
for an error.

Meson: Fix linking the unit tests' vendor libraries

See merge request !213

README: mention that the repo now lives on gitlab.fdo

See merge request !208

egl: misc python fixes

See merge request !218

egl: #include <stddef.h> for `NULL`

See merge request !215

`imp` is deprecated, and there's no reason to do things this complicated
when it's the only possibility.

meson: fix double-space in pkg-config description

See merge request !214

vnd-glapi: allow asm to be used on ELFv2 ppc64 big endian

See merge request !211

These entry points are actually not little endian specific,
but they are specific to ELFv2 ABI. ELFv2 ABI can be used
on either little or big endian, and there are distributions
doing so (e.g. Void Linux, Adélie Linux) as well as other
OSes transitioning (FreeBSD).

These have been confirmed to work on a Power Mac G5 running
Void Linux.

Add a "version" parameter to the dummy libraries instead of using a separate cp
command.

Use shared_library() instead of shared_module() when building the dummy
libraries. This causes Meson to add --no-undefined to the linker instead of
--allow-shlib-undefined.

Fix linking #199

See merge request !210

Fix Meson build for ARM and PPC

See merge request !209

This matches configure.ac and also allows Meson to configure on ARMv7.
Otherwise it would fail with

    ERROR: Problem encountered: No matching ASM file for armv7_tsd

Print the value of gl_dispatch_type so that you can easily tell from the output
what it's going to be using.