RFR: JDK-8145564: 8036003: startup regression on linux fastdebug builds

[Erik Joelsson]

Hello,

Please review this quick fix for the build issue introduced in Hotspot 
by JDK-8036003. The short story is that if you set DEBUG_BINARIES=true 
when building Hotspot fastdebug, you essentially get a slowdebug build. 
For an explanation of why, see comment in bug. This behavior is of 
course also a bug, but not something I will address in this quick fix.

What happened in JDK-8036003 was that a new configure API for 
controlling debug symbols was introduced. The two main settings of this 
new parameter, --with-native-debug-symbols, that we use internally at 
Oracle are "external" and "zipped". It was important to us that the 
behavior of these did not change with JDK-8036003, but exactly that did 
happen, because both of these settings now cause DEBUG_BINARIES=true to 
be set. This variable has never been set by configure before and because 
of the above weird behavior in the Hotspot makefiles, we are having 
problems.

My proposed quick fix is to not set DEBUG_BINARIES=true for "external" 
or "zipped". It can remain true for "internal" since Oracle never builds 
it that way, and I understand those that requested this new configure 
parameter were setting DEBUG_BINARIES=true as a workaround before this 
anyway, so they should be fine with the broken fastdebug behavior for a 
while more. I will file a follow up bug to properly clean up this mess, 
but it will take some more time.

Bug: https://bugs.openjdk.java.net/browse/JDK-8145564
Webrev: http://cr.openjdk.java.net/~erikj/8145564/webrev.01/

/Erik