Make the xxd command in shader/meson.build less fragile

meson.build

@@ -7,6 +7,7 @@ if host_system == 'darwin'
 endif
 
 xxd = find_program('xxd', native: true)
+xxd_supports_n = run_command(xxd, '-n', 'meson', '-i', meson.current_source_dir() / 'meson.build', check: false).returncode() == 0
 
 git_hash = run_command('git', 'rev-parse', '--short', 'HEAD').stdout().strip()
 

shader/meson.build

@@ -41,7 +41,9 @@ foreach file : embedded_shaders_f
     global_sources += custom_target(embedded_shaders[count],
         input: file,
         output: '@0@.xxd'.format(embedded_shaders[count]),
-        command: [
+        command: xxd_supports_n ? [
+            xxd, '-n', '___shader_@0@'.format(embedded_shaders[count].replace('.', '_')), '-i', '@INPUT@'
+        ] : [
             xxd, '-i', '@INPUT@'
         ],
         capture: true,