Disable incremental linking for gn osmesa

third_party/mesa/mesa.gyp

Index: third_party/mesa/mesa.gyp
diff --git a/third_party/mesa/mesa.gyp b/third_party/mesa/mesa.gyp
index 367e5ec3da3156c153f7559b9e4ea5aea3d47e96..17a9b34f2a56ccdd1e729b55344be79329eddd15 100644
--- a/third_party/mesa/mesa.gyp
+++ b/third_party/mesa/mesa.gyp
@@ -686,6 +686,13 @@
       },
       'conditions': [
         ['OS=="win"', {
+          'variables': {
+            # Disable incremental linking for all modules to avoid linker crash.
+            # TODO(brucedawson) : remove when crbug.com/482671 is resolved by
+            # Microsoft.
+            # 0: inherit, 1: disabled, 2: enabled.
+            'msvs_debug_link_incremental': '1',

[scottmg, 2016/03/29 17:03:43]

I don't know what that variable is supposed to do. I think you want
msvs_settings>VCLinkerTool>LinkIncremental: 1.

+          },
           'defines': [
             'BUILD_GL32',
             'KEYWORD1=GLAPI',