1.19 powerpc64le run-pass test failure: smallest-hello-world sometimes has bad interaction with --gc-sections

[infinity0]

This test fails on Debian but not Fedora. I can also reproduce it with the clean 1.19.0 tarball without Debian patches, but ./configure-d to use Debian's LLVM 4.0.

------stderr------------------------------
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/stage2/lib/rustlib/powerpc64le-unknown-linux-gnu/lib" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/test/run-pass/smallest-hello-world.0.o" "-o" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/test/run-pass/smallest-hello-world.stage2-powerpc64le-unknown-linux-gnu" "-Wl,--gc-sections" "-pie" "-Wl,-O1" "-nodefaultlibs" "-L" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/test/run-pass" "-L" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/test/run-pass/smallest-hello-world.stage2-powerpc64le-unknown-linux-gnu.run-pass.libaux" "-L" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/native/rust-test-helpers" "-L" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/stage2/lib/rustlib/powerpc64le-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/stage2/lib/rustlib/powerpc64le-unknown-linux-gnu/lib/liblibc-5281d33b9c81245c.rlib" "/<<BUILDDIR>>/rustc-1.19.0+dfsg3/build/powerpc64le-unknown-linux-gnu/stage2/lib/rustlib/powerpc64le-unknown-linux-gnu/lib/libcore-5c2b844a2a519641.rlib" "-Wl,-Bdynamic" "-l" "c" "-l" "m" "-l" "rt" "-l" "pthread" "-l" "util" "-Wl,-rpath,/usr/lib/rustlib/powerpc64le-unknown-linux-gnu/lib" "-Wl,--enable-new-dtags"
  = note: /usr/bin/ld: stubs don't match calculated size
          /usr/bin/ld: can not build stubs: Invalid operation
          collect2: error: ld returned 1 exit status
          

error: aborting due to previous error(s)
------------------------------------------

As indicated by the error message there is a long cc invocation. If I run it manually, I get the same failure. However if I remove the "-Wl,--gc-sections" flag then the compilation succeeds. Adding "-Wl,--print-gc-sections" gives me:

(experimental_ppc64el-dchroot)infinity0@plummer:~/rustc-1.19.0-src$ sh test.sh
/usr/bin/ld: Removing unused section '.rodata.cst4' in file '/usr/lib/gcc/powerpc64le-linux-gnu/7/../../../powerpc64le-linux-gnu/Scrt1.o'
/usr/bin/ld: Removing unused section '.data' in file '/usr/lib/gcc/powerpc64le-linux-gnu/7/../../../powerpc64le-linux-gnu/Scrt1.o'
/usr/bin/ld: Removing unused section '.text.rust_eh_register_frames' in file '/home/infinity0/rustc-1.19.0-src/build/powerpc64le-unknown-linux-gnu/test/run-pass/smallest-hello-world.0.o'
/usr/bin/ld: Removing unused section '.text.rust_eh_unregister_frames' in file '/home/infinity0/rustc-1.19.0-src/build/powerpc64le-unknown-linux-gnu/test/run-pass/smallest-hello-world.0.o'
/usr/bin/ld: stubs don't match calculated size
/usr/bin/ld: can not build stubs: Invalid operation
collect2: error: ld returned 1 exit status

[infinity0]

Seems to be caused by binutils trunk commits https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876134

[infinity0]

Fixed in binutils upstream and Debian unstable, closing.