[PATCH] meson: Provide default values for nonexistent xenlight pkgconfig vars

[Michal Privoznik]

It may happen that xenlight pkgconfig file does not contain
'xenfirmwaredir' and/or 'libexec_bin' variables, which is okay
and we have code that deals with this situation. But that code is
executed when the queried value is an empty string. This may not
always be the case and we should specifically set 'default_value'
so that the empty string is returned if pkgconfig variable
doesn't exist.

Fixes: 968479adcfa5c49b29b7b6680dcaffde1408f044
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index f9834a36c2..3d870d77db 100644
--- a/meson.build
+++ b/meson.build
@@ -1478,8 +1478,8 @@ if not get_option('driver_libxl').disabled() and conf.has('WITH_LIBVIRTD')
   libxl_dep = dependency('xenlight', version: '>=' + libxl_version, required: get_option('driver_libxl'))
 
   if libxl_dep.found()
-    libxl_firmware_dir = libxl_dep.get_variable(pkgconfig : 'xenfirmwaredir')
-    libxl_execbin = libxl_dep.get_variable(pkgconfig : 'libexec_bin')
+    libxl_firmware_dir = libxl_dep.get_variable(pkgconfig : 'xenfirmwaredir', default_value: '')
+    libxl_execbin = libxl_dep.get_variable(pkgconfig : 'libexec_bin', default_value: '')
     if libxl_firmware_dir != ''
       conf.set_quoted('LIBXL_FIRMWARE_DIR', libxl_firmware_dir)
     endif
-- 
2.37.4