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Commit Graph

1471 Commits

Author SHA1 Message Date
Stefan Granitz
1f86f5bfe6 Specify log level for CMake messages (less stderr)
Summary:
Specify message levels in CMake. Prefer STATUS (stdout).

As the default message mode (i.e. level) is NOTICE in CMake, more then necessary messages get printed to stderr. Some tools,  noticably ccmake treat this as an error and require additional confirmation and re-running CMake's configuration step.

This commit specifies a mode (either STATUS or WARNING or FATAL_ERROR)  instead of the default.

* I used `csearch -f 'llvm-project/.+(CMakeLists\.txt|cmake)' -l 'message\("'` to find all locations.
* Reviewers were chosen by the most common authors of specific files. If there are more suitable reviewers for these CMake changes, please let me know.

Patch by: Christoph Siedentop

Reviewers: zturner, beanz, xiaobai, kbobyrev, lebedev.ri, sgraenitz

Reviewed By: sgraenitz

Subscribers: mgorny, lebedev.ri, #sanitizers, lldb-commits, llvm-commits

Tags: #sanitizers, #lldb, #llvm

Differential Revision: https://reviews.llvm.org/D63370

llvm-svn: 363821
2019-06-19 15:25:32 +00:00
Saleem Abdulrasool
0d0cbbbdf4 build: extract LLVM distribution target handling
This extracts the LLVM distribution target handling into a support module.
Extraction will enable us to restructure the builds to support multiple
distribution configurations (e.g. developer and user) to permit us to build the
development package and the user package at once.

llvm-svn: 363440
2019-06-14 18:28:57 +00:00
Saleem Abdulrasool
16f4f43d09 build: don't attempt to run config.guess on Windows
When cross-compiling LLVM to android from Windows (for LLVMSupport), we would
attempt to execute `config.guess` to determine the host triple since
`CMAKE_SYSTEM_NAME` is not Windows and `CMAKE_C_COMPILER` will be set to GNU or
Clang.  This will fail as `config.guess` is a shell script which cannot be
executed on Windows.  Simply log a warning instead.  The user can specify the
value for this instead in those cases.

llvm-svn: 363420
2019-06-14 16:47:04 +00:00
David Tenty
d4999fa5bd Build with _XOPEN_SOURCE defined on AIX
Summary:
It is useful to build with _XOPEN_SOURCE defined on AIX, enabling X/Open
and POSIX compatibility mode, to work around stray macros and other
bugs in the headers provided by the system and build compiler.

This patch adds the config to cmake to build with _XOPEN_SOURCE defined
on AIX with a few exceptions. Google Test internals require access to
platform specific thread info constructs on AIX so in that case we build
with _ALL_SOURCE defined instead. Libclang also uses header which needs
_ALL_SOURCE on AIX so we leave that as is as well.

We also add building on AIX with the large file API and doing CMake
header checks with X/OPEN definitions so the results are consistent with
the environment that will be present in the build.

Reviewers: hubert.reinterpretcast, xingxue, andusy

Reviewed By: hubert.reinterpretcast

Subscribers: mgorny, jsji, cfe-commits, llvm-commits

Tags: #llvm, #clang

Differential Revision: https://reviews.llvm.org/D62533

llvm-svn: 362808
2019-06-07 15:45:25 +00:00
Stefan Granitz
97358278c6 [CMake] Export CMAKE_CONFIGURATION_TYPES for the LLVM build-tree
Summary: Useful info for standalone builds of subprojects. If a multi-configuration generator was used for the provided LLVM build-tree, standalone builds should consider actual subdirectories per configuration in `find_program()` (e.g. looking for `llvm-lit` or `llvm-tblgen`).

Reviewers: labath, beanz, mgorny

Subscribers: lldb-commits, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62878

llvm-svn: 362588
2019-06-05 08:29:24 +00:00
Eugene Leviant
01c4e6c46e [HWASAN][CMake] Allow instrumenting LLVM/clang
Differential revision: https://reviews.llvm.org/D62813

llvm-svn: 362474
2019-06-04 09:04:53 +00:00
Saleem Abdulrasool
4d26af708b tools: add llvm-nm and llvm-objcopy to tools
Add `nm` and `objcopy` to the default value for the tools that we install now
that they are sufficiently feature complete to replace bintuils' implementation.

Patch by Jiang Yi!

llvm-svn: 362425
2019-06-03 17:17:09 +00:00
Don Hinton
8b85cd846b [test] Fix plugin tests
Recommit of r361790 that was temporarily reverted in r361793 due to bot breakage.

Summary:
The following changes were required to fix these tests:

1) Change LLVM_ENABLE_PLUGINS to an option and move it to
   llvm/CMakeLists.txt with an appropriate default -- which matches
   the original default behavior.

2) Move the plugins directory from clang/test/Analysis
   clang/lib/Analysis.  It's not enough to add an exclude to the
   lit.local.cfg file because add_lit_testsuites recurses the tree and
   automatically adds the appropriate `check-` targets, which don't
   make sense for the plugins because they aren't tests and don't
   have `RUN` statements.

   Here's a list of the `clang-check-anlysis*` targets with this
   change:

```
  $ ninja -t targets all| sed -n "s/.*\/\(check[^:]*\):.*/\1/p" | sort -u | grep clang-analysis
  check-clang-analysis
  check-clang-analysis-checkers
  check-clang-analysis-copypaste
  check-clang-analysis-diagnostics
  check-clang-analysis-engine
  check-clang-analysis-exploration_order
  check-clang-analysis-html_diagnostics
  check-clang-analysis-html_diagnostics-relevant_lines
  check-clang-analysis-inlining
  check-clang-analysis-objc
  check-clang-analysis-unified-sources
  check-clang-analysis-z3
```

3) Simplify the logic and only include the subdirectories under
   clang/lib/Analysis/plugins if LLVM_ENABLE_PLUGINS is set.

Reviewed By: NoQ

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D62445

llvm-svn: 362328
2019-06-02 15:53:43 +00:00
Petr Hosek
ddcad306ab [CMake] Use libtool for runtimes when building for Apple platform
LLVM CMake build already uses libtool instead of ar when building
for Apple platform and we should be using the same when building
runtimes. To do so, this change extracts the logic for finding
libtool into a separate file and then uses it from both the LLVM
build as well as the LLVM runtimes build.

Differential Revision: https://reviews.llvm.org/D62769

llvm-svn: 362313
2019-06-02 02:05:01 +00:00
Chris Bieneman
d7ad967701 [CMake] Feed BUNDLE_PATH through llvm target wrappers
This feeds the new llvm_codsign BUNDLE_PATH option through from the llvm target wrapper functions, so that you can specify the BUNDLE_PATH on the target's codesign.

llvm-svn: 362248
2019-05-31 17:40:49 +00:00
Petr Hosek
635759ce04 [CMake] Provide an option to use relative paths in debug info
CMake always uses absolute file paths in the generated compiler
invocation which results in absolute file paths being embedded in debug
info. This is undesirable when building a toolchain e.g. on bots as the
debug info may embed the bot source checkout path which is meaningless
anywhere else.

This change introduces the LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO which uses
-fdebug-prefix-map (where supported) options to rewrite paths embedded
into debug info with relative ones. Additionally, LLVM_SOURCE_PREFIX can
be used to override the path to source directory with a different one.

Differential Revision: https://reviews.llvm.org/D62622

llvm-svn: 362185
2019-05-31 01:34:51 +00:00
Chris Bieneman
8b91915280 Support codesigning bundles and forcing
Summary:
Clangd's framework is assembled by copying binaries from the lib and bin directories into a bundle shape. This results in an invalid bundle code signature because the signature only applies to the binaries not the resources.

This patch adds two new options to `llvm_codesign` to enable re-signing the library and XPC service as bundles.

The `BUNDLE_PATH` option allow specifying an explicit path to codesign, which enables signing bundles which aren't generated using CMake's `FRAMEWORK` or `BUNDLE` target properties.

The `FORCE` option allows re-signing binaries that have already been signed. This is required for how clangd exposes the clangd library and tools as both XPC and non-XPC services using the same binary.

Reviewers: jkorous, bogner

Reviewed By: bogner

Subscribers: mgorny, ilya-biryukov, dexonsmith, arphaman, kadircet, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D62693

llvm-svn: 362169
2019-05-30 22:25:48 +00:00
Alexandre Ganea
04498a83a8 Revert r361826, as it still breaks LLDB.
llvm-svn: 361837
2019-05-28 15:04:39 +00:00
Alexandre Ganea
023ca6322c [CMake] Default options for faster executables on MSVC
Differential Revision: https://reviews.llvm.org/D55056

llvm-svn: 361826
2019-05-28 14:14:48 +00:00
Don Hinton
80dfad1fb5 Revert [test] Fix plugin tests
This reverts r361790 (git commit fe5eaab2b5b4523886bd63aebcfea8cfce586fa1)

It's causing buildbot breakage, so reverting while I investigate.

llvm-svn: 361793
2019-05-28 06:38:16 +00:00
Don Hinton
ad324f4b75 [test] Fix plugin tests
Summary:
The following changes were required to fix these tests:

1) Change LLVM_ENABLE_PLUGINS to an option and move it to
   llvm/CMakeLists.txt with an appropriate default -- which matches
   the original default behavior.

2) Move the plugins directory from clang/test/Analysis
   clang/lib/Analysis.  It's not enough to add an exclude to the
   lit.local.cfg file because add_lit_testsuites recurses the tree and
   automatically adds the appropriate `check-` targets, which don't
   make sense for the plugins because they aren't tests and don't
   have `RUN` statements.

   Here's a list of the `clang-check-anlysis*` targets with this
   change:

```
  $ ninja -t targets all| sed -n "s/.*\/\(check[^:]*\):.*/\1/p" | sort -u | grep clang-analysis
  check-clang-analysis
  check-clang-analysis-checkers
  check-clang-analysis-copypaste
  check-clang-analysis-diagnostics
  check-clang-analysis-engine
  check-clang-analysis-exploration_order
  check-clang-analysis-html_diagnostics
  check-clang-analysis-html_diagnostics-relevant_lines
  check-clang-analysis-inlining
  check-clang-analysis-objc
  check-clang-analysis-unified-sources
  check-clang-analysis-z3
```

3) Simplify the logic and only include the subdirectories under
   clang/lib/Analysis/plugins if LLVM_ENABLE_PLUGINS is set.

Reviewed By: NoQ

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D62445

llvm-svn: 361790
2019-05-28 06:26:58 +00:00
Akira Hatanaka
2e1cd6b131 Revert "[Analysis] Link library dependencies to Analysis plugins"
This reverts commit r361340. The following builder has been broken for
the past few days because of this commit:

http://green.lab.llvm.org/green/job/clang-stage2-cmake-RgSan/

Also revert r361399, which was committed to fix r361340.

llvm-svn: 361685
2019-05-25 00:50:03 +00:00
Daniel Sanders
aa086c31cb Fix BUILD_SHARED_LIBS builds after r361567
Also fixed a comment I noticed while debugging this build

llvm-svn: 361591
2019-05-24 02:15:27 +00:00
Daniel Sanders
3812992d9b Break false dependencies on target libraries
Summary:
For the most part this consists of replacing ${LLVM_TARGETS_TO_BUILD} with
some combination of AllTargets* so that they depend on specific components
of a target backend rather than all of it. The overall effect of this is
that, for example, tools like opt no longer falsely depend on the
disassembler, while tools like llvm-ar no longer depend on the code
generator.

There's a couple quirks to point out here:
* AllTargetsCodeGens is a bit more prevalent than expected. Tools like dsymutil
  seem to need it which I was surprised by.
* llvm-xray linked to all the backends but doesn't seem to need any of them.
  It builds and passes the tests so that seems to be correct.
* I left gold out as it's not built when binutils is not available so I'm
  unable to test it

Reviewers: bogner, JDevlieghere

Reviewed By: bogner

Subscribers: mehdi_amini, mgorny, steven_wu, dexonsmith, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62331

llvm-svn: 361567
2019-05-23 23:02:56 +00:00
Don Hinton
8b90db1c7f [cmake] When getting Ninja version, don't include CMakeNinjaFindMake
which doesn't play well with passing CMAKE_MAKE_PROGRAM from the
commandline without a path.

Fixes a bug introduced in r361280.

Thanks to Mikael Holmén for reporting this!

llvm-svn: 361501
2019-05-23 15:03:22 +00:00
David Zarzycki
7ab73950dc Unbreak non-PIC builds after r361340/D62174
llvm-svn: 361399
2019-05-22 15:48:12 +00:00
Petr Hosek
cd0eede62b [Analysis] Link library dependencies to Analysis plugins
These are needed to avoid undefined symbols which aren't satisfied
by Clang itself.

Differential Revision: https://reviews.llvm.org/D62174

llvm-svn: 361340
2019-05-22 00:47:37 +00:00
Don Hinton
83f8553c44 [cmake] Don't use VERSION_GREATER_EQUAL in cmake versions prior to 3.72.
llvm-svn: 361291
2019-05-21 19:25:54 +00:00
Don Hinton
b0ab36dd90 [cmake] Try to make cmake happy and fix bots.
llvm-svn: 361286
2019-05-21 18:51:21 +00:00
Don Hinton
a1b4a637eb [cmake] Bug in r361281: make include optional and fix typo which might make a difference on some systems.
llvm-svn: 361282
2019-05-21 18:15:01 +00:00
Don Hinton
44cf151218 [cmake] Add custom command to touch archives on Darwin so ninja won't rebuild them.
Summary:
clang and newer versions of ninja use high-resolutions timestamps, but
older versions of libtool on Darwin don't, so the archive will often
get an older timestamp than the last object that was added or updated.
To fix this, we add a custom command to touch the archive after it's
been built so that ninja won't rebuild it unnecessarily the next time
it's run.

Reviewed By: beanz

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62172

llvm-svn: 361280
2019-05-21 17:56:45 +00:00
Petr Hosek
be9c349f37 [CMake] Specify component for all target types
This addresses an issue introduced in r360230 which broke existing
use cases of LLVM_DISTRIBUTION_COMPONENTS since ARCHIVE and LIBRARY
target types are no longer handled as components.

Differential Revision: https://reviews.llvm.org/D62176

llvm-svn: 361223
2019-05-21 07:13:58 +00:00
Nico Weber
3199cc5666 Tweaks for setting CMAKE_LINKER to lld-link
- Just look for "lld-link", not "lld-link.exe".
  llvm/cmake/platforms/WinMsvc.cmake for example sets CMAKE_LINKER to
  lld-link without .exe

- Stop passing -gwarf to the compiler in sanitizer options when lld is
  enabled -- there's no reason to use different debug information keyed
  off the linker. (If this was for MinGW, we should check for that
  instead.)

Differential Revision: https://reviews.llvm.org/D62111

llvm-svn: 361214
2019-05-21 03:01:01 +00:00
Saleem Abdulrasool
0866c6522b build: use clang-cl for runtimes when targeting Windows
When targeting Windows and building a runtime (subproject) prefer to use
`clang-cl` rather than the `clang` driver.  This allows us to cross-compile
runtimes for the Windows environment from Linux.

llvm-svn: 361072
2019-05-17 20:09:06 +00:00
Petr Hosek
4da3cc501c [Analysis] Only run plugins tests if plugins are actually enabled
When plugins aren't enabled, don't try to run plugins tests. Don't
enable plugins unconditionally based on the platform, instead check
if LLVM shared library is actually being built which may not be the
case for every host configuration, even if the host itself supports
plugins.

This addresses test failures introduced by r360891/D59464.

Differential Revision: https://reviews.llvm.org/D62050

llvm-svn: 360991
2019-05-17 06:07:37 +00:00
Simon Pilgrim
0f4d0047f4 [cmake] Remove MSVC C4800 override
Remove C4800 : ''type' : forcing value to bool 'true' or 'false' (performance warning)' from the list of forced disabled warnings.

I'm not seeing any regressions in VS2017/VS2019 llvm/clang builds from removing this.

Differential Revision: https://reviews.llvm.org/D61730

llvm-svn: 360417
2019-05-10 10:22:13 +00:00
Simon Pilgrim
b25d3737f1 [cmake] Remove MSVC C4355 override
Remove C4355 : ''this' : used in base member initializer list' from the list of forced disabled warnings.

I'm not seeing any regressions in VS2017/VS2019 llvm/clang builds from removing this.

Differential Revision: https://reviews.llvm.org/D61757

llvm-svn: 360413
2019-05-10 09:54:42 +00:00
Simon Pilgrim
64d204e02e Fix whitespace mismatches. NFCI.
Tabs are not our friends.

llvm-svn: 360248
2019-05-08 13:02:32 +00:00
Martin Storsjo
19f9180ee5 [CMake] Install import libraries
Simplify the cmake logic to install both runtime and import
libraries (treated as ARCHIVE), as the later are needed to link
against llvm.

Patch by Julien Schueller!

Differential Revision: https://reviews.llvm.org/D61425

llvm-svn: 360230
2019-05-08 08:37:34 +00:00
Chris Bieneman
bd1db07d46 [CMake] Detecting python modules should be cached
Summary: This requres exec-ing python, which in a trace I ran of the CMake re-configure time took ~2% of the reconfigure time.

Reviewers: phosek, smeenai, compnerd

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61402

llvm-svn: 360196
2019-05-07 21:46:55 +00:00
Xing Xue
058f92c5ec Add libc++ to link XRay test cases if libc++ is used to build CLANG
Summary: When libc++ is used to build CLANG, its XRay libraries libclang_rt.xray-*.a have dependencies on libc++. Therefore, libc++ is needed to link and run XRay test cases. For Linux -rpath is also needed to specify where to load libc++. This change sets macro LLVM_LIBCXX_USED to 1 if libc++ is actually used in the build. XRay tests then check the flag and add -L<llvm_shlib_dir> -lc++ and -Wl,-rpath=<llvm_shlib_dir> if needed.

Reviewers: hubert.reinterpretcast, amyk, dberris, jasonliu, sfertile, EricWF

Subscribers: dberris, mgorny, jsji, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61016

llvm-svn: 360060
2019-05-06 17:45:21 +00:00
Alexandre Ganea
ed2d1ea835 Fix CMake Invalid Escape Sequence
Patch by xoviat

Differential Revision: https://reviews.llvm.org/D60658

llvm-svn: 360045
2019-05-06 14:07:01 +00:00
Saleem Abdulrasool
3c0a69a728 build: add option to disable unwind tables
The unwind tables (`.eh_frame`, `.arm.extab`) add a significant chunk of data to
the final binaries.  These should not be needed normally, particularly when
exceptions are disabled.  This enables shrinking `lldb-server` by ~18% (3 MiB)
when built with gold.

llvm-svn: 359819
2019-05-02 19:37:26 +00:00
Russell Gallop
47cfb36d4a Add llvm-profdata to LLVM_TOOLCHAIN_TOOLS
This is required for using PGO on Windows but isn't in the Windows
release packages. Windows packages are built with
LLVM_INSTALL_TOOLCHAIN_ONLY so only includes llvm "tools" listed here.

Differential Revision: https://reviews.llvm.org/D61317

llvm-svn: 359569
2019-04-30 15:35:16 +00:00
Russell Gallop
aadfc01dad [cmake] Fix error message on simulated VS version check
For clang-cl self hosts in VS2015 environment this was reporting: "Host
Clang must have at least -fms-compatibility-version=19.00.24213.1, your
version is 9.0.0".

This check fires as CMake detects the simulated environment as _MSC_VER
1900, which is truncated. This makes it less than the required
19.00.24213.1.

Differential revision: https://reviews.llvm.org/D61188

llvm-svn: 359556
2019-04-30 12:37:10 +00:00
Simon Atanasyan
13532dff44 [cmake] Disable a GCC optimization when building LLVM for MIPS
GCC when compiling LLVM for MIPS can introduce a jump to an uninitialized
value when shrink wrapping is enabled. As shrink wrapping is enabled in
GCC at all optimization levels, it must be disabled. This bug exists for
all versions of GCC since 4.9.2.

This partially resolves PR37701 / GCC PR target/86069.

Patch by Simon Dardis.

Differential Revision: https://reviews.llvm.org/D48069

llvm-svn: 359376
2019-04-27 09:28:54 +00:00
Keno Fischer
2abca233ae [CMake][PowerPC] Recognize LLVM_NATIVE_TARGET="ppc64le" as PowerPC
Summary:
This value is derived from the host triple, which on the machine
I'm currently using is `ppc64le-linux-redhat`. This change makes
LLVM compile.

Reviewers: nemanjai
Differential Revision: https://reviews.llvm.org/D57118

llvm-svn: 359242
2019-04-25 21:28:03 +00:00
Alex Langford
334995ba64 [CMake] Use add_dependencies in add_llvm_install_targets
Summary:
The CMake documentation says that the `DEPENDS` field of
add_custom_target is for files and output of custom commands. Adding a
dependency on a target should be done with `add_dependency`.

Differential Revision: https://reviews.llvm.org/D60879

llvm-svn: 359042
2019-04-23 21:59:07 +00:00
Don Hinton
5e503b6e37 [cmake] Fix bug in r358779 - [CMake] Pass monorepo build settings in cross compile
Escape semicolons in the targets list so that cmake doesn't expand
them to spaces.

llvm-svn: 358859
2019-04-21 19:20:13 +00:00
Chris Bieneman
71e0dfe09e [CMake] Pass monorepo build settings in cross compile
This allows the cross compiled build targets to configure the LLVM tools and sub-projects that are part of the main build.

This is needed for generating native non llvm *-tablegen tools when cross compiling clang in the monorepo build environment.

llvm-svn: 358779
2019-04-19 20:08:55 +00:00
Stefan Granitz
22bfb00747 [CMake] Allow custom extensions for externalized debug info
Summary:
Extra flexibility for emitting debug info to external files (remains Darwin only for now).
LLDB needs this functionality to emit a LLDB.framework.dSYM instead of LLDB.dSYM when building the framework, because the latter could conflict with the driver's lldb.dSYM when emitted in the same directory on case-insensitive file systems.

Reviewers: friss, bogner, beanz

Subscribers: mgorny, aprantl, llvm-commits, #lldb

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60862

llvm-svn: 358685
2019-04-18 16:37:07 +00:00
Dmitri Gribenko
bf11a7cc89 Removed CMake cache upgrade code from 2011
Summary:
This code was added in r141266 to make a breaking change to CMake, but
still be compatible with existing cache files.  The cache files from
2011 are irrelevant today in 2019.

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60711

llvm-svn: 358482
2019-04-16 09:46:02 +00:00
Pengxuan Zheng
594362df34 [cmake] Fix dependency issue in TableGen
Summary:
There is a bug in add_tablegen which causes cmake to fail with the following
error message if LLVM_TABLEGEN is set.

CMake Error at cmake/modules/TableGen.cmake:147 (add_dependencies):
  The dependency target "LLVM-tablegen-host" of target "CLANG-tablegen-host"
  does not exist.
Call Stack (most recent call first):
  tools/clang/utils/TableGen/CMakeLists.txt:3 (add_tablegen)

The issue happens because setting LLVM_TABLEGEN causes cmake to skip generating
the LLVM-tablegen-host target. As a result, a non-existent target was added for
CLANG-tablegen-host causing cmake to fail.

In order to fix this issue, this patch adds a guard to check the validity of the
dependency target before adding it as a dependency.

Reviewers: aganea, smeenai

Reviewed By: aganea

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60576

llvm-svn: 358226
2019-04-11 21:05:15 +00:00
Martin Storsjo
5628f415b9 [CMake] Fix accidentally swapped input/output parameters of string(REPLACE) for mingw
llvm-svn: 357979
2019-04-09 08:31:25 +00:00
Justin Bogner
7c89ab3542 [CMake] Move configuration of LLVM_CXX_STD to HandleLLVMOptions.cmake
Standalone builds of projects other than llvm itself (lldb, libcxx,
etc) include HandleLLVMOptions but not the top level llvm CMakeLists,
so we need to set this variable here to ensure that it always has a
value.

This should fix the build issues some folks have been seeing.

llvm-svn: 357976
2019-04-09 08:14:32 +00:00