Compiling recent OpenJDK 9 on Fedora 21 gives compile error:

/home/peter/work/hg/jdk9-dev/jdk/src/java.desktop/share/native/libsplashscreen/splashscreen_png.c: In function 'SplashDecodePng':
/home/peter/work/hg/jdk9-dev/jdk/src/java.desktop/share/native/libsplashscreen/splashscreen_png.c:51:16: error: variable 'row_pointers' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
     png_bytepp row_pointers = NULL;
                ^
/home/peter/work/hg/jdk9-dev/jdk/src/java.desktop/share/native/libsplashscreen/splashscreen_png.c:52:15: error: variable 'image_data' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
     png_bytep image_data = NULL;
               ^
cc1: all warnings being treated as errors
gmake[3]: *** [/home/peter/work/hg/jdk9-dev/build/linux-x86_64-normal-server-release/support/native/java.desktop/libsplashscreen/splashscreen_png.o] Error 1
gmake[3]: *** Waiting for unfinished jobs....
Awt2dLibraries.gmk:879: recipe for target '/home/peter/work/hg/jdk9-dev/build/linux-x86_64-normal-server-release/support/native/java.desktop/libsplashscreen/splashscreen_png.o' failed
gmake[2]: *** [java.desktop-libs] Error 1
make/Main.gmk:168: recipe for target 'java.desktop-libs' failed