imgui: Silence build warnings for imgui

Avoid treating any warnings as errors in the third-party imgui code, and
use Wno-error=stringop-overflow for code in Mesa.

Suggested-by: @eric

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35853>

src/imgui/meson.build

@@ -1,7 +1,7 @@
 libimgui_core = static_library(
   'imgui_core',
   files('imgui.cpp', 'imgui_draw.cpp', 'imgui_widgets.cpp'),
-  cpp_args : ['-w'],
+  cpp_args : cpp.get_supported_arguments('-w', '-Wno-error'),
   install : false
 )
 

src/intel/tools/meson.build

@@ -200,7 +200,7 @@ if with_tools.contains('intel-ui')
     include_directories : [inc_include, inc_src, inc_intel],
     c_args : [no_override_init_args],
     gnu_symbol_visibility : 'hidden',
-    cpp_args : ['-fpermissive', '-Wno-parentheses'],
+    cpp_args : cpp.get_supported_arguments('-fpermissive', '-Wno-parentheses', '-Wno-error=stringop-overflow'),
     install : true
   )
 
@@ -221,7 +221,7 @@ if with_tools.contains('intel-ui')
     include_directories : [inc_include, inc_src, inc_intel],
     c_args : [no_override_init_args],
     gnu_symbol_visibility : 'hidden',
-    cpp_args : ['-fpermissive', '-Wno-parentheses'],
+    cpp_args : cpp.get_supported_arguments('-fpermissive', '-Wno-parentheses', '-Wno-error=stringop-overflow'),
     install : true
   )
 endif

src/vulkan/overlay-layer/meson.build

@@ -28,7 +28,7 @@ vklayer_files = files(
 vklayer_mesa_overlay = shared_library(
   'VkLayer_MESA_overlay',
   vklayer_files, overlay_spv, sha1_h,
-  c_args : [no_override_init_args],
+  c_args : no_override_init_args + cc.get_supported_arguments('-Wno-error=stringop-overflow'),
   gnu_symbol_visibility : 'hidden',
   dependencies : [idep_vulkan_util, idep_mesautil, vulkan_wsi_deps, libimgui_core_dep, dep_dl],
   include_directories : [inc_include, inc_src],