x86_32:

/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c: In function 'setupBlitVector':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c:108:21: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
             ginfo = (GlyphInfo*)imagePtrs[g];
                     ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c:121:21: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
             ginfo = (GlyphInfo*)imagePtrs[g];
                     ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c: In function 'setupLCDBlitVector':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c:534:17: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
         ginfo = (GlyphInfo*)imagePtrs[0];
                 ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c:569:21: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
             ginfo = (GlyphInfo*)imagePtrs[g];
                     ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/share/native/libfontmanager/DrawGlyphList.c:650:21: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   ... (rest of output omitted)
* For target support_native_java.desktop_libfontmanager_X11FontScaler.o:
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c: In function 'Java_sun_font_NativeStrikeDisposer_freeNativeScalerContext':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c:53:36: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     NativeScalerContext *context = (NativeScalerContext*)pScalerContext;
                                    ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c: In function 'Java_sun_font_NativeFont_countGlyphs':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c:212:36: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     NativeScalerContext *context = (NativeScalerContext*)
                                    ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c: In function 'Java_sun_font_NativeStrike_getMaxGlyph':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c:230:36: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     NativeScalerContext *context = (NativeScalerContext*)pScalerContext;
                                    ^
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c: In function 'Java_sun_font_NativeFont_getGlyphAdvance':
/home/buildbot/worker/build-jdkX-linux/build/src/java.desktop/unix/native/libfontmanager/X11FontScaler.c:245:36: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     NativeScalerContext *context = (NativeScalerContext*)pScalerContext;
   ... (rest of output omitted)

It seems to happen because int-to-pointer-cast warning used to be disabled for this code:
 https://hg.openjdk.java.net/jdk/jdk/rev/cda47533b1ee#l1.107

...and it is not disabled anymore:
  https://hg.openjdk.java.net/jdk/jdk/rev/cda47533b1ee#l1.116