Linker warning on Mac OS X Mavericks 10.9.5

[virtuoushub]

ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame

Has anyone else come across this?

The ant task completes with BUILD SUCCESSFUL. After reading your guidelines, I looked into the issue somewhat and saw two Google Groups discussions mentioned a couple times.

• https://groups.google.com/forum/#!topic/llvm-dev/i6ukUxqf6wc
• https://groups.google.com/forum/#!topic/darwin-dev/li90veDvquQ

I was unable to determine the cause and if the warning can be safely ignored.

Steps to reproduce _(assumes successful $ ant compile-templates):_

$ ant compile-native

Observed output:
...
ommited some output for breviety
...

compile-native-macosx:
 [SDK Root] /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk

-link-if-necessary:

-update-dependencies:

-link:
   [Linker] ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame

BUILD SUCCESSFUL
Total time: 19 seconds

Environmental Details

$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
$ ant -version
Apache Ant(TM) version 1.9.4 compiled on April 29 2014
#for sake of completion including some more relevant info output from Maven
$ mvn -v
...
Java version: 1.6.0_65, vendor: Apple Inc.
...
OS name: "mac os x", version: "10.9.5", arch: "x86_64", family: "mac"

[Spasi]

Thanks, I'm seeing the same warning on Travis.

[virtuoushub]

You are welcome. Quick question that is semi related:
Should I be using Java 6 or 7? Looking at your Travis config for the OS X branch and the Setup Wiki it looks like 7.

However, looking at build.xml it looks like 6.

I have gotten it to work with 6-8, however using Apple's JDK 6 was a PITA.

[Spasi]

The codebase is Java 6 compatible, but I'm also building on Java 7 on OS X, for the same reason. Don't worry about it, unless you need to contribute something and worry about using a Java 7+ API.

[virtuoushub]

Understood. I am not worried about it, however if you want me to open a pull request, I did get building the project on OS X using Apple's JDK 6 to work in one of my fork's branches.

[Spasi]

The warning is emitted because _ffi_call_unix64 is hand-coded assembly and it isn't compatible with compact unwind. I have disabled compact unwind until the issue is fixed in libFFI. I don't think this will affect us in any way.

I've also fixed the build to work out of the box on OS X with JDK 6, with e871dea. Thanks @virtuoushub!

[virtuoushub]

You are most welcome. Thank you for looking into the linker warning and getting an OS X/JDK 6 build working.