On 1/03/2014 1:38 AM, Yasumasa Suenaga wrote:
The proper way to fix this is to disable FDS.
Does this mean I have to pass --disable-debug-symbols to configure ? I've added comment to JDK-8036003, I think if we pass --disable-debug-symbols to configure, gcc/g++ is not passed -g option. "-g" is needed to generate debuginfo.
There are three pieces to all of this: 1. Generating debug symbols in the binaries (via gcc -g or whatever) 2. Generating debuginfo files (zipped or not) (FDS) 3. Stripping debug symbols from the binaries (strip-policy) It may be that we don't have clean separation between them, and if so that should be fixed, but I don't see the current proposal as the way forward. Also there may well be differences between how things are handled on the JDK side and hotspot side. I will try to look closer if I get a chance but my time is limited at the moment. David
Thanks,
Yasumasa
On 2014/02/28 23:04, Daniel D. Daugherty wrote:
The proper way to fix this is to disable FDS. We should not need yet another option to control debug info.
Dan
On 2/28/14 4:13 AM, David Holmes wrote:
Hi,
As I put in the bug report this seems way too complicated. Seems to me all you need to do to get what you want is not use FDS and not strip the symbols from the binary. The former is trivial. The latter is more awkward as the strip policy stuff does not work as I would want it to work, but still doable.
David
On 28/02/2014 7:18 PM, Yasumasa Suenaga wrote:
Hi all,
Currently, configure script can accept --disable-debug-symbols and --disable-zip-debug-info as controlling to generate debug information. However, current makefiles cannot build ELF binaries which is contained debug information with "images" target.
Some Linux distros use RPM as package manager. RPM is built by rpmbuild command, it strips symbols and debug information during to generate rpm packages. https://fedoraproject.org/wiki/Packaging:Debuginfo
For example, OpenJDK8 in Fedora20 ships libjvm.so and libjvm.debuginfo . libjvm.debuginfo is generated in OpenJDK's makefiles, however it does not contain debug information. Actual debug information is shipped by OpenJDK debuginfo package. This packaging is important when we have to debug JVM/JNI libraries. If we want to use debugging tools (GDB, SystemTap, etc...), they may requires debuginfo package. Debuggee (e.g. libjvm.so) points libjvm.so.debug which is located at sub directory in /usr/lib/debug . It is defined in ELF section (.note.gnu.build-id) of libjvm.so . However libjvm.so.debug does not contain valid debug information. We need to access libjvm.debuginfo.debug at same location.
When we think to build OpenJDK rpm packages, we have to build ELF binaries which contain all debug information. we should not to separate debug information.
Thus I want to add a variable "SEPARATED_DEBUGINFO_FILES" . If we pass "SEPARATED_DEBUGINFO_FILES=false" to make command, "make" does not execute objcopy command for generating debuginfo binaries.
If we build rpm packages, we also have to add "STRIP_POLICY=no_strip" to arguments of make command. Or ELF binaries will be stripped.
I've uploaded webrev for this enhancement. This is separated 3-part: top of forest, hotspot, jdk http://cr.openjdk.java.net/~ysuenaga/JDK-8036003/
Please review it and sponsoring!
Thanks,
Yasumasa
P.S. I tried to add SEPARATED_DEBUGINFO_FILES as a configure option like "--disable-separated-debug-info" . I ran configure which is located at jdk9/dev directory after I ran autoconf and common/autoconf/autogen.sh. However it failed.
I guess this is caused by changeset as below. JDK-8035495: Improvements in autoconf integration http://hg.openjdk.java.net/jdk9/dev/rev/6e29cd9ac2b4
This changes add "CHECKME" option to configure script. However, this changes affects "configure" only. It should change "configure.ac" .