[mutter/wip/hadess/fedora-no-wayland] wayland: Fix wayland session not starting on some systems

[Bastien Nocera <hadess src gnome org>]

commit 5ae999822ad7dded5c3c194a273b498ac19c18cf
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Mar 3 15:26:06 2020 +0100

    wayland: Fix wayland session not starting on some systems
    
    Fedora's mutter is built with --auto-features=enabled which enables
    -initfd support. But the current meson code doesn't check whether
    -initfd is available in Xwayland, leading to the wayland session not
    starting up.
    
    Check for -initfd's availability before enabling it.

 meson.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 96f53ddc4..777086801 100644
--- a/meson.build
+++ b/meson.build
@@ -396,11 +396,14 @@ if have_wayland
 
   # For Xwayland -initfd usage
   use_initfd = get_option('xwayland_initfd')
+  xwayland_options = run_command(xwayland_path, '-help')
   if use_initfd.auto()
-    xwayland_options = run_command(xwayland_path, '-help')
     have_xwayland_initfd = xwayland_options.stderr().contains('-initfd')
   else
     have_xwayland_initfd = use_initfd.enabled()
+    if have_xwayland_initfd and not xwayland_options.stderr().contains('-initfd')
+      error('XWayland -initfd support requested but not available')
+    endif
   endif
 
   if (have_xwayland_initfd)