meson: Provide default values for nonexistent xenlight pkgconfig vars

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@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

diff --git a/meson.build b/meson.build
index e48e63ef0171859319ab3aee69d292deb4def382..1a13148c51e2b0e10e2ebcdda634bf331b0ca18c 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1433,8 +1433,8 @@ 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