Hi All, If you compile jchuff.c (part of javajpeg) without "--disable-warnings-as-errors", then you get an error that kills the build. This is seen in these circumstances:
Build: JDK9 gcc and g++ Version: 4.8.5 Platform: zLinux 64bit (s390x) The error message is: /home/adamfarl/hotspot/jdk9/jdk/src/java.desktop/share/native/libjavajpeg/jchuff.c: In function 'jGenOptTbl': /home/adamfarl/hotspot/jdk9/jdk/src/java.desktop/share/native/libjavajpeg/jchuff.c:808:18: error: array subscript is below array bounds [-Werror=array-bounds] while (bits[j] == 0) ^ It looks to me that this error happens because the while loop can technically reduce j down to beneath 0, resulting in us attempting to find the array entry with index -1. On the basis that if we get down to -1 here bad things will happen regardless, perhaps we should change that line to: while ((bits[j] == 0) && (j != 0)) This appears to prevent the compiler failing with this error, by providing unambiguous handling for the "index -1" scenario. Thoughts? Best Regards Adam Farley Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU