On 2016-10-12 13:07, David Holmes wrote:
On 12/10/2016 7:04 PM, Magnus Ihse Bursie wrote:
On 2016-10-12 04:38, David Holmes wrote:
On 11/10/2016 7:41 PM, Erik Joelsson wrote:
Hello,
After the cleanup of C++ linking with the GCC toolchain. We missed
updating one instance with the correct TOOLCHAIN configuration. This
leads to build failures for arm ports with slowdebug. I have no
idea why
it only happens there, but correcting the TOOLCHAIN configuration (so
that g++ is used to link instead of gcc) makes it build again.
Unexplained errors raise alarm bells for me. This particular reference
relates to C++ exception handling which raises questions:
- why only on this platform?
- why only in slowdebug?
- why only in this code? (which seems unrelated to exceptions)
I agree the fix is to use g++ instead of gcc for linking, assuming the
exception related code should actually be there.
The alarm bells ringed for me too. :-) I actually started debugging this
one, but Erik beat me to it. :) I did however conclude that this error
occured due to static linking (without it, everything went fine) and if
I explicitely specified -lstdc++ as well, I got a more informative
error, telling me that the static version of libgcc was not found. I
didn't go further, since Erik found the (correct) solution, but I assume
that the devkit we use to build for the arm platforms are missing some
bits, which was only needed for slowdebug builds.
Still too vague for me. What is special about this code?
I have no idea. The question should probably be rephrased: "Why does
this work on all the other platforms, when it's obviously incorrect?"
And the answer to that is most likely "*shrug* ... pure luck?".
/Magnus
Thanks,
David
/Magnus
Thanks,
David
The build error looks like this:
/localhome/hg/jdk9-dev-CDR/build/linux-arm64-slowdebug/support/native/jdk.pack200/unpackexe/bands.o:(.data.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0):
undefined reference to `__gxx_personality_v0'
collect2: error: ld returned 1 exit status
Bug: https://bugs.openjdk.java.net/browse/JDK-8167479
Webrev: http://cr.openjdk.java.net/~erikj/8167479/webrev.01/
/Erik
