Recent failures after turning on more LLVM tools

[nathanchance]

• https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/199950114
  https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/199950118
  https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/199950120

  Stuff along the lines of:

  0000000000000000 R_AARCH64_ABS64 sort
  0000000000000008 R_AARCH64_ABS64 __ksymtab_strings
  drivers/firmware/efi/libstub/lib-sort.stub.o: absolute symbol references not allowed in the EFI stub
  

  It looks like this is probably caused by llvm-strip not supporting the globs in STUBCOPY_RM-y, which @rupprecht noted here. These were removed upstream in torvalds/linux@02562d0 because of torvalds/linux@f922c4a. torvalds/linux@f922c4a decently backports to 4.9 and 4.14, not so clean for 4.4. Might be wise to conditionally turn on llvm-strip.

• https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/199950119
  https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/199950121

  llvm-objcopy-9: error: 'firmware/e100/d101m_ucode.bin.ihex': The file was not recognized as a valid object file
  

  Relevant bits of Makefile:

  fw-shipped-$(CONFIG_E100) += e100/d101m_ucode.bin e100/d101s_ucode.bin \
    		     e100/d102e_ucode.bin
  ...
  quiet_cmd_ihex  = IHEX    $@
      cmd_ihex  = $(OBJCOPY) -Iihex -Obinary $< $@
  

  This was "resolved" upstream by torvalds/linux@5620a0d, which we obviously can't backport. We could apply a local patch that removes the fw-shipped rule in the Makefile or fix llvm-objcopy (if it is even broken).

[nickdesaulniers]

that's ok, the failures were intentional to shake out bugs. Let's:

1. File relevant bugs per issue to track getting these turned back on.
2. revert my enabling of strip and objcopy
3. fix bugs from 1
4. revert the revert from 2
   Sound good?

[nathanchance]

Sounds good to me!

[rupprecht]

For the glob characters issue, it sound like there's no opposition to just supporting them: https://bugs.llvm.org/show_bug.cgi?id=41268. No one has gotten around to it yet.

ihex support is coming in D60270, but I haven't had any time in the past few weeks to review it.

(edit: moved this to the bugs that were split off)

[nathanchance]

We are tracking this in ClangBuiltLinux/linux#478 and ClangBuiltLinux/linux#480, I don't think there is any reason to keep this open.