Disable pointer-to-int conversion warning.

pdfium.gyp

 {
   'variables': {
     'win_third_party_warn_as_error': 'false',
     'pdf_use_skia%': 0,
   },
   'target_defaults': {
     'defines' : [
       'FOXIT_CHROME_BUILD',
       '_FXFT_VERSION_=2501',
       '_FPDFSDK_LIB',
@@ skipping 469 matching lines @@
         'core/src/fxcodec/libjpeg/jerror.h',
         'core/src/fxcodec/libjpeg/jinclude.h',
         'core/src/fxcodec/libjpeg/jmemsys.h',
         'core/src/fxcodec/libjpeg/jmorecfg.h',
         'core/src/fxcodec/libjpeg/jpegint.h',
         'core/src/fxcodec/libjpeg/jpeglib.h',
         'core/src/fxcodec/libjpeg/jversion.h',
         'core/src/fxcodec/libjpeg/makefile',
         'core/src/fxcodec/libjpeg/transupp.h',
       ],
+      'conditions': [
+        ['os_posix==1', {
+          # core/src/fxcodec/fx_libopenjpeg/src/fx_mct.c does an pointer-to-int
+          # conversion to check that an address is 16-bit aligned (benign).
+          'cflags_c': [ '-Wno-pointer-to-int-cast' ],
+        }],
+      ],
     },
     {
       'target_name': 'fxcrt',
       'type': 'static_library',
       'ldflags': [ '-L<(PRODUCT_DIR)',],
       'sources': [
         'core/include/fxcrt/fx_arb.h',
         'core/include/fxcrt/fx_basic.h',
         'core/include/fxcrt/fx_coordinates.h',
         'core/include/fxcrt/fx_ext.h',
@@ skipping 335 matching lines @@
         'fpdfsdk/src/formfiller/FFL_ListBox.cpp',
         'fpdfsdk/src/formfiller/FFL_Notify.cpp',
         'fpdfsdk/src/formfiller/FFL_PushButton.cpp',
         'fpdfsdk/src/formfiller/FFL_RadioButton.cpp',
         'fpdfsdk/src/formfiller/FFL_TextField.cpp',
         'fpdfsdk/src/formfiller/FFL_Utils.cpp',
       ],
     },
   ],
 }