meson: Add libdw option to control libdw dependency

Previously it was not possible to disable libdw usage if it was
detected. Fix that by adding a meson feature option.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

meson_options.txt

@@ -42,6 +42,11 @@ option('lc-compliance',
         value : 'auto',
         description : 'Compile the lc-compliance test application')
 
+option('libdw',
+        type : 'feature',
+        value : 'auto',
+        description : 'Enable libdw integration for backtrace symbolization')
+
 option('libunwind',
         type : 'feature',
         value : 'auto',

src/libcamera/base/meson.build

@@ -26,7 +26,7 @@ libcamera_base_internal_sources = files([
     'utils.cpp',
 ])
 
-libdw = dependency('libdw', required : false)
+libdw = dependency('libdw', required : get_option('libdw'))
 libunwind = dependency('libunwind', required : get_option('libunwind'))
 
 if cc.has_header_symbol('execinfo.h', 'backtrace')