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[cmake] Pass through the cmake_3_2_USES_TERMINAL variable so we get progress bars on an external compiler-rt build

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This patch introduces the -fwhole-program-vtables flag, which enables the
whole-program vtable optimization feature (D16795) in Clang.

Differential Revision: http://reviews.llvm.org/D16821

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Summary:
This patch is provided in preparation for removing autoconf on 1/26. The proposal to remove autoconf on 1/26 was discussed on the llvm-dev thread here: http://lists.llvm.org/pipermail/llvm-dev/2016-January/093875.html

    "This is the way [autoconf] ends
    Not with a bang but a whimper."
    -T.S. Eliot

Reviewers: chandlerc, grosbach, bob.wilson, echristo

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D16472

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The add_dependencies call on compiler-rt-configure adds llvm-config and clang to the phony target, but not to the actual configure custom command. We need the dependency bound to the custom command so that it can't be re-ordered by Ninja.

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This is needed if your make tool is overridden.

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This prevents passthrough variables from having values.

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When passing around CMake arguments as lists of arguments any arguments containing lists need to have their semi-colons escaped otherwise CMake will split the arguments in the middle.

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This allows COMPILER_RT_* variables to be passed from the top-level CMake into the external project when LLVM_BUILD_EXTERNAL_COMPILER_RT=On.

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The required compiler-rt changes aren't present yet so attempting to
build with compiler-rt breaks. And since we're trying to deprecate
autotools we actually want to fix this in CMake primarily anyway.

This reverts r251712.

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Hopefully autotools will be deprecated soon and this entire file can go away,
but until then...

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This change makes LLVM_BUILD_EXTERNAL_COMPILER_RT work correctly when overriding CMAKE_INSTALL_PREFIX on the install action (which is how LLVM_CREATE_XCODE_TOOLCHAIN works).

This fix is two parts:
(1) Pass CMAKE_INSTALL_PREFIX in as a variable from the parent install to the child install
(2) When passing COMPILER_RT_INSTALL_PATH into the external project make sure it is passed as a string not a path.

Not specifying the full path for COMPILER_RT_INSTALL_PATH isn't enough to fix the issue because relative paths specified on the CMake command line are expanded relative to the working directory before the cache is populated. Forcing this to a string allows it to remain a relative path through to the install() calls. Relative paths specified in install() calls are expanded relative to CMAKE_INSTALL_PREFIX at install time.

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[CMake] When building clang as an external project we should pass through all variables that start with COMPILER_RT

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Summary:
Many small improvements to LLVM_BUILD_EXTERNAL_COMPILER_RT.

* Works correctly with Ninja by working around CMake Bug 14771 (https://cmake.org/Bug/view.php?id=14771)
* Has install-compiler-rt target, and installs as part of the default install target
* Sets the install paths properly so that it matches the non-standalone build
* Only generate the test targets if(LLVM_INCLUDE_TESTS)

Reviewers: samsonov, Bigcheese

Differential Revision: http://reviews.llvm.org/D13399

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Summary: When LLVM/Clang is built without ARM support, the ios_kext runtime
library is not built, but without this patch, the Makefile still tries to
copy it. This is a recent regression, because the ios_kext library used
to also be built on x86_64.

Reviewers: beanz

Subscribers: aemerson, cfe-commits, rengolin

Differential Revision: http://reviews.llvm.org/D13421

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[darwin] [builtins] Stop generating cc_kext_ios5 and move iOS architectures out of cc_kext into cc_kext_ios

Summary:
This corresponds to a patch to compiler-rt (D13112).

Xcode 7 doesn't support targeting iOS5 and earlier. Instead of just dropping cc_kext_ios5, I've repurposed it to cc_kext_ios, and I'm pulling the iOS architectures out of cc_kext. Putting OS X and iOS slices inside the same archive was just odd.

Reviewers: bogner, bob.wilson

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D13113

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Summary:
UBSan is now used in the same way as ASan, and is supported on
OSX and on iOS simulator. At the moment ASan and UBSan can't be used
together due to PR21112, but I hope to resolve it soon by
embedding UBSan into ASan.

Test Plan: regression test suite.

Reviewers: zaks.anna, kubabrecka

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D8471

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This is a re-application of r229554 restricted to Linux build only.
Apple still uses Makefile/autoconf to build Clang and sanitizers.

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This reverts commit r229554.

Reverting this commit for now as several apple internal builds still
rely on this functionality.

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They autotools build has a number of missing features, supports less
OS, architectures, build configurations, doesn't have any tests and
is hard to support in sync with CMake build.

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This reverts the runtime library portion of r194168. As of r221621,
the libclang_rt libraries for Darwin build with explicit SDK options
so there is no need to set SDKROOT here.

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This was already set up for the iOS simulator ASan dylib simulator,
and this change extends that to the other iOS runtime libraries.
This is in preparation for building all those iOS libraries against
the real SDKs instead of the fake SDKs in compiler-rt.

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Reviewed at http://reviews.llvm.org/D6176




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Call it "libclang_rt.builtins-<arch>.a" to be consistent
with sanitizers/profile libraries naming. Modify Makefile
and CMake build systems and Clang driver accordingly.

Fixes PR19822.


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asan_cxx containts replacements for new/delete operators, and should
only be linked in C++ mode. We plan to start building this part
with exception support to make new more standard-compliant.

See https://code.google.com/p/address-sanitizer/issues/detail?id=295
for more details.


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from (external) compiler-rt build tree into LLVM/Clang build tree in
LLVM_BUILD_EXTERNAL_COMPILER_RT mode.

For instance, running
  make asan -j12
in LLVM/Clang build tree will now build Clang, use it to configure
compiler-rt build tree, and invoke "make asan -j12" there. ASan runtime will
be built in the proper location, where Clang driver expects to find it.

Running
  make check-asan
will build Clang, use it to configure compiler-rt build tree, build everything
there, and then run "make check-asan" in compiler-rt build tree using just-built
Clang and ASan runtime.


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With this change, one may set LLVM_BUILD_EXTERNAL_COMPILER_RT option
to build compiler-rt libraries with just-built Clang.

  make compiler-rt
in the build tree will build all compiler-rt libraries with just-built Clang
and copy them to the proper location in the Clang resource directory.

  make check-compiler-rt
will run the compiler-rt test suite using just-built Clang and runtime
libraries.

The goal is to make LLVM_BUILD_EXTERNAL_COMPILER_RT the default, so that
we can always build compiler-rt libraries with Clang, not the host compiler,
and for all the platforms Clang can target.


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There's nothing Darwin-based in the files or target now, so the previous name
is now misleading.

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The soft-float variants of (embedded) libclang_rt only make sense for ARM, so
there's no point in trying to build them if the compiler is only capable of
targeting x86.

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This builds extra versions of compiler-rt targeting various unhosted targets.
Only built on Darwin since even though they're not iOS or OSX, they share some
quirks.

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When using the configure build system, the libc++ headers were being
installed in lib/, whereas cmake installs them in include/. Since
include/ makes more sense for headers, we'll make both systems install
headers there.

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