记录编译JDK11源码时遇到的两个问题

执行make all报错信息:

1. 错误一

/src/hotspot/share/runtime/arguments.cpp:1461:35: error: result of comparison against a string literal is unspecified (use an explicit string comparison function instead) [-Werror,-Wstring-compare]
      if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
                                  ^  ~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

解决方案：

这个是jdk11的一个bug【https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244803】，看bug历史好像已经修复，不过官方发布的openjdk-11+28_src.zip【http://jdk.java.net/java-se-ri/11】还是存在bug，只能按照bug描述，修改源码之后再进行编译。

　　2.错误二

src/java.desktop/macosx/native/libawt_lwawt/awt/CSystemColors.m:134:9: error: converting the result of '?:' with integer constants to a boolean always evaluates to 'true' [-Werror,-Wtautological-constant-compare]
    if (colorIndex < (useAppleColor) ? sun_lwawt_macosx_LWCToolkit_NUM_APPLE_COLORS : java_awt_SystemColor_NUM_COLORS) {
        ^
1 error generated.

同理，参考github【https://github.com/openjdk/jdk/commit/4622a18a】修改源码。

重新make all编译正常