meson: add system-pybind11 option

Add system-pybind11 option (dependency only required if pykms is enabled).

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
---
Changes v2 -> v3:
  - build pykms only if pybind11 dependency is found
Changes v1 -> v2:
  - renamed use-system-pybind11 to system-pybind11 option
  - change system-pybind11 dependency only required if pykms is enabled

meson.build

@@ -39,8 +39,12 @@ else
                                     compile_args : '-DFMT_HEADER_ONLY')
 endif
 
-pybind11_includes = include_directories('ext/pybind11/include')
-pybind11_dep = declare_dependency(include_directories : pybind11_includes)
+if get_option('system-pybind11')
+    pybind11_dep = dependency('pybind11', required : get_option('pykms'))
+else
+    pybind11_includes = include_directories('ext/pybind11/include')
+    pybind11_dep = declare_dependency(include_directories : pybind11_includes)
+endif
 
 libdrmomap_dep = dependency('libdrm_omap', required : get_option('omap'))
 

meson_options.txt

@@ -4,3 +4,4 @@ option('omap', type : 'feature', value : 'auto')
 option('static-libc', type : 'boolean', value : false)
 option('utils', type : 'boolean', value : true)
 option('system-fmt', type : 'boolean', value : false)
+option('system-pybind11', type : 'boolean', value : false)

py/pykms/meson.build

@@ -4,6 +4,10 @@ if py3_dep.found() == false
     subdir_done()
 endif
 
+if pybind11_dep.found() == false
+    subdir_done()
+endif
+
 pykms_sources = files([
     'pykmsbase.cpp',
     'pykms.cpp',