[oe] [meta-clang] llvm-config cross-compile improvements

[Martin Kelly]

Hi,

This patch series fixes a number of issues I hit when trying to use the 
meta-clang llvm-config to cross-compile a project that uses CMake, 
calling into llvm-config, to determine compile flags. With the series 
applied, the cross compile successfully builds and runs. Please let me 
know if you have any concerns or if there is something I missed, and I 
will fix it up.

The following changes since commit c9c74d269ba79abbc20919de96f1eb2b8a81edec:

   clang/compiler-rt: Fix nativesdk builds break compiler-rt dep for 
clang (2017-03-16 22:54:02 -0700)

are available in the git repository at:

   https://github.com/surround-io/meta-clang

for you to fetch changes up to 7d294bc2548ade23b7d25761d73769e712617c51:

   clang: build for only target and host (2017-03-18 18:01:50 -0700)

----------------------------------------------------------------
Martin Kelly (5):
       clang: correct spacing issue
       clang: remove commented-out code
       clang: fix the llvm-common wrapper
       clang: build libLLVM.so
       clang: build for only target and host

  recipes-devtools/clang/clang.inc 
      |  5 ++++-
 
recipes-devtools/clang/clang/0004-llvm-allow-env-override-of-exe-path.patch 
| 36 ++++++++++++++++++++++++++++++++++
  recipes-devtools/clang/clang_git.bb 
      | 52 ++++++++++++++++++++++----------------------------
  recipes-devtools/clang/llvm-common/llvm-config 
      | 41 +++++++++++++++++++++++++++++++--------
  4 files changed, 96 insertions(+), 38 deletions(-)
  create mode 100644 
recipes-devtools/clang/clang/0004-llvm-allow-env-override-of-exe-path.patch