[Bug 1042819] Re: clang -O4 fails with gold in a trivial example

[Matthias Klose]

maybe it would be a good idea to add that option automatically

** Changed in: llvm-3.0 (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: llvm-3.0 (Ubuntu)
       Status: Invalid => Triaged

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Title:
  clang -O4 fails with gold in a trivial example

Status in “binutils” package in Ubuntu:
  Invalid
Status in “clang” package in Ubuntu:
  Invalid
Status in “llvm-3.0” package in Ubuntu:
  Triaged
Status in “llvm-3.1” package in Ubuntu:
  Invalid

Bug description:
  $ echo 'int main(){return 0;}' > foo.c
  $ clang -v -O4 -use-gold-plugin foo.c -o foo
  Ubuntu clang version 3.0-6ubuntu3 (tags/RELEASE_30/final) (based on LLVM 3.0)
  Target: x86_64-pc-linux-gnu
  Thread model: posix
   "/usr/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-llvm-bc -disable-free -disable-llvm-verifier -main-file-name foo.c -mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version 2.22 -momit-leaf-frame-pointer -v -resource-dir /usr/bin/../lib/clang/3.0 -fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/clang/3.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /usr/include -O3 -ferror-limit 19 -fmessage-length 142 -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak -fobjc-fragile-abi -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/foo-VnFyCO.o -x c foo.c
  clang -cc1 version 3.0 based upon llvm 3.0 hosted on x86_64-pc-linux-gnu
  ignoring nonexistent directory "/usr/bin/../lib/clang/3.0/include"
  ignoring nonexistent directory "/usr/bin/../lib/clang/3.0/include"
  ignoring duplicate directory "/usr/local/include"
  ignoring duplicate directory "/usr/include/x86_64-linux-gnu"
  ignoring duplicate directory "/usr/include/x86_64-linux-gnu"
  ignoring duplicate directory "/usr/include/x86_64-linux-gnu"
  ignoring duplicate directory "/usr/include"
  #include "..." search starts here:
  #include <...> search starts here:
   /usr/local/include
   /usr/include/x86_64-linux-gnu
   /usr/include
   /usr/include/clang/3.0/include/
   /usr/lib/gcc/x86_64-linux-gnu/4.6/include/
   /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed/
  End of search list.
   "/usr/bin/ld" -z relro --hash-style=gnu --as-needed --build-id --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o foo /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.6/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../.. -L/lib/x86_64-linux-gnu -L/lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib /tmp/foo-VnFyCO.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/4.6/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crtn.o -plugin /usr/bin/../lib/LLVMgold.so
  /tmp/foo-VnFyCO.o: file not recognized: File format not recognised
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  --- 
  ApportVersion: 2.5.1-0ubuntu2
  Architecture: amd64
  DistroRelease: Ubuntu 12.10
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  Package: llvm-3.1
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm-256color
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
  Tags:  quantal running-unity
  Uname: Linux 3.5.0-11-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-01-04 (236 days ago)
  UserGroups: adm admin cdrom dialout kvm libvirtd lp lpadmin plugdev sambashare sbuild vboxusers

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