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configure.sh: Remove armv6-darwin target.

- iOS SDKs no longer ship with armv6 support.
- Our minimum iOS version means all target devices have neon.
- Remove armv6 darwin LD workaround.
  - This removes a TODO.

Change-Id: I2fcb5b82c96213364275475be021c7dd8459d5c0

--- a/README

+++ b/README

@@ -47,7 +47,6 @@

   --help output of the configure script. As of this writing, the list of

   available targets is:

-    armv6-darwin-gcc

     armv6-linux-rvct

     armv6-linux-gcc

     armv6-none-rvct

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -1018,18 +1018,7 @@

           NM="$(${XCRUN_FIND} nm)"

           RANLIB="$(${XCRUN_FIND} ranlib)"

           AS_SFX=.s

-

-          # Special handling of ld for armv6 because libclang_rt.ios.a does

-          # not contain armv6 support in Apple's clang package:

-          #   Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn).

-          # TODO(tomfinegan): Remove this. Our minimum iOS version (6.0)

-          # renders support for armv6 unnecessary because the 3GS and up

-          # support neon.

-          if [ "${tgt_isa}" = "armv6" ]; then

-            LD="$(${XCRUN_FIND} ld)"

-          else

-            LD="${CXX:-$(${XCRUN_FIND} ld)}"

-          fi

+          LD="${CXX:-$(${XCRUN_FIND} ld)}"

           # ASFLAGS is written here instead of using check_add_asflags

           # because we need to overwrite all of ASFLAGS and purge the

--- a/configure

+++ b/configure

@@ -98,7 +98,6 @@

 # all_platforms is a list of all supported target platforms. Maintain

 # alphabetically by architecture, generic-gnu last.

-all_platforms="${all_platforms} armv6-darwin-gcc"

 all_platforms="${all_platforms} armv6-linux-rvct"

 all_platforms="${all_platforms} armv6-linux-gcc"

 all_platforms="${all_platforms} armv6-none-rvct"