meson.build: enable CPP include check only in case CPP compiler is available

Drop hard meson C++/CPP dependency, only needed for the build-time
header inclusion test, build the test only in case C++/CPP compiler
is available.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/meson.build b/meson.build
index 7f114a20312be7fa52aa7a1c0d43284c9a6e36ae..f2f3dd1d6a086347b8723a7c13d850a50bd72da9 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('libinput', 'c', 'cpp',
+project('libinput', 'c',
        version : '1.12.3',
        license : 'MIT/Expat',
        default_options : [ 'c_std=gnu99', 'warning_level=2' ],
@@ -651,12 +651,14 @@ executable('test-build-linker',
           include_directories : [includes_src, includes_include],
           dependencies : [ dep_libinput, dep_libinput_util ],
           install : false)
-# test including from C++
-executable('test-build-cxx',
-          'test/build-cxx.cc',
-          dependencies : [dep_udev],
-          include_directories : [includes_src, includes_include],
-          install : false)
+# test including from C++ (in case CPP compiler is available)
+if add_languages('cpp', required: false)
+       executable('test-build-cxx',
+                  'test/build-cxx.cc',
+                  dependencies : [dep_udev],
+                  include_directories : [includes_src, includes_include],
+                  install : false)
+endif
 
 # This is the test suite runner, we allow disabling that one because of
 # dependencies