[llvm-bugs] [Bug 36470] New: clang/llvm revision 325569 and newer are unable to build Firefox, with "test-ctors.so: terminate called after throwing an instance of 'std::runtime_error'" and then " what(): Unsupported relocation type"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36470

            Bug ID: 36470
           Summary: clang/llvm revision 325569 and newer are unable to
                    build Firefox, with "test-ctors.so: terminate called
                    after throwing an instance of 'std::runtime_error'"
                    and then " what():  Unsupported relocation type"
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dholbert at mozilla.com
                CC: grimar at accesssoftek.com, llvm-bugs at lists.llvm.org,
                    mh+llvm at glandium.org, sylvestre at debian.org

I build Firefox with clang trunk (which I build locally ~weekly), and I noticed
today that I got a build failure with the newest clang trunk.

Specifically:
 llvm revision 325568 builds Firefox fine
 llvm revision 325569 hits a build error

So I believe this is a regression from grimar's https://reviews.llvm.org/D43383

The build error is in the "elfhack" stage of the build, and my output looks
like this:

 4:21.16 === If you get failures below, please file a bug describing the error
 4:21.16 === and your environment (compiler and linker versions), and
 4:21.16 === provide the pre-elfhacked library as an attachment.
 4:21.16 === Use --disable-elf-hack until this is fixed.
 4:21.16 ===
 4:21.17  0x000000000000000c (INIT)               0x4060
 4:21.17 test-ctors.so: terminate called after throwing an instance of
'std::runtime_error'
 4:21.17   what():  Unsupported relocation type
 4:21.22 Makefile:17: recipe for target 'test-array.so' failed
 4:21.22 make[4]: *** [test-array.so] Aborted (core dumped)
 4:21.22 make[4]: *** Waiting for unfinished jobs....
 4:21.28 Makefile:17: recipe for target 'test-ctors.so' failed
 4:21.28 make[4]: *** [test-ctors.so] Aborted (core dumped)
 4:21.28 /scratch/work/builds/mozilla-inbound/mozilla/config/recurse.mk:100:
recipe for target 'build/unix/elfhack/libs' failed
 4:21.28 make[3]: *** [build/unix/elfhack/libs] Error 2
 4:21.28 /scratch/work/builds/mozilla-inbound/mozilla/config/recurse.mk:32:
recipe for target 'libs' failed
 4:21.28 make[2]: *** [libs] Error 2
 4:21.28 /scratch/work/builds/mozilla-inbound/mozilla/config/rules.mk:434:
recipe for target 'default' failed
 4:21.28 make[1]: *** [default] Error 2
 4:21.28 client.mk:168: recipe for target 'build' failed
 4:21.28 make: *** [build] Error 2


The "Aborted (core dumped)" there looks like it's saying the compiler crashed,
I think....

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