When using LLVM_DISTRIBUTION_COMPONENTS, it's possible for clang's
export list to be empty. If this happens the install(EXPORTS) command
will fail, but since there isn't anything to install anyway we really
just want to skip it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@286210 91177308-0d34-0410-b5e6-96231b3b80d8

We need to apply the same export logic in clang as in llvm for
LLVM_DISTRIBUTION_COMPONENTS, or the clang exports will be invalid
when we use this config.

This makes using distribution components without setting
LLVM_TOOLCHAIN_ONLY=On work correctly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@286181 91177308-0d34-0410-b5e6-96231b3b80d8

These cache file are provided as an example of how to set up simple multi-stage CMake builds. I have a batch of documentation updates for LLVM.org which reference these files.

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This is needed by downstream projects such as swift to get proper cmake
dependency information for LLVM/Clang targets.

A few months ago I added support for exporting this information for Clang
libraries. In order to be incremental, I did not add support for exporting clang
tools as well at that time. Now such support is needed, so I am committing this
incremental code.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284658 91177308-0d34-0410-b5e6-96231b3b80d8

This allows you to set PGO_INSTRUMENT_LTO=Thin and have it work correctly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284646 91177308-0d34-0410-b5e6-96231b3b80d8

The Xcode toolchain targets are useful on OS X hosts because you can construct and install multiple toolchians that can be used seamlessly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278987 91177308-0d34-0410-b5e6-96231b3b80d8

This patch adds a few new convenience options used by the PGO CMake cache to setup options on bootstrap stages. The new options are:

PGO_INSTRUMENT_LTO - Builds the instrumented and final builds with LTO
PGO_BUILD_CONFIGURATION - Accepts a CMake cache script that can be used for complex configuration of the stage2-instrumented and stage2 builds.

The patch also includes a fix for bootstrap dependencies so that the instrumented LTO tools don't get used when building the final stage, and it adds distribution targets to the passthrough.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278862 91177308-0d34-0410-b5e6-96231b3b80d8

This is just a minor update to the Apple packaging configuration.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278849 91177308-0d34-0410-b5e6-96231b3b80d8

LibCXX settings are configured in stage2 so we don't need them here.

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LLVM_BUILD_TOOLS is a boolean variable that controls whether or not generated
targets for llvm tools are built by the "all" target. CLANG_BUILD_TOOLS is an
analogous variable for clang targets.

This is useful functionality for selectively disabling the building of clang
targets by default to speed up builds.

In terms of implementation, I just followed the model of LLVM's implementation
of this functionality.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275006 91177308-0d34-0410-b5e6-96231b3b80d8

This matches how LLVM has its cmake files organized and is cleaner than just
shoving this business logic into the main CMakeLists.txt.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274180 91177308-0d34-0410-b5e6-96231b3b80d8

[ClangConfig] Unset some variables after we are done using them to configure ClangConfig.cmake.in files.

This ensures that the values do not bleed over in between computations. It may
make sense in the future to just refactor this code into functions to provide
"true scoping".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274179 91177308-0d34-0410-b5e6-96231b3b80d8

[ClangConfig] Instead of hard coding the ClangTargets location to /ClangTargets.cmake, follow LLVM's example and use a pre-computed cmake variable @CLANG_CONFIG_EXPORTS_FILE@.

This just makes ClangConfig more consistent with LLVMConfig.

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[ClangConfig] Follow LLVM's example and only install Clang{Config,Target}.cmake when LLVM_INSTALL_TOOLCHAIN_ONLY is disabled.

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This will allow for cmake to expand variables in ClangConfig.cmake for
downstream users.

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[ClangConfig] Copy ClangConfig.cmake to ${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR} instead of to ${CLANG_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}.

This is an obvious bug since ClangConfig.cmake looks for ClangTargets.cmake in
${CMAKE_CURRENT_LIST_DIR}. But ClangTargets.cmake is in
${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}, so it will always fail with an
in tree build.

In the case where clang is built out of tree, this is still correct since
CMAKE_BINARY_DIR and CLANG_BINARY_DIR will be the same.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274168 91177308-0d34-0410-b5e6-96231b3b80d8

[ClangConfig] Replace paths with the same value as CLANG_INSTALL_PACKAGE_DIR with a deref of the variable.

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[cmake] Move creation of ClangTargets and installation of ClangConfig.cmake from ./CMakeLists.txt -> ./cmake/modules/CMakeLists.txt.

This matches LLVM.

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We want to be able to run the compiler-rt tests on stage2 build configurations in CI. This should enable that.

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This allows llvm-profdata to interact with profiles containing
compressed name data.

rdar://problem/26122944

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Since the option was removed in r268670, the cache scripts should stop referring to it.

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On Darwin the default is to build PIC and link PIE. We shouldn't need to override that in the Apple Clang distributions.

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This enables installing the libcxx headers.

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This installs the clang headers as part of the install-distribution target.

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This installs the clang headers as part of the install-distribution target.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@268319 91177308-0d34-0410-b5e6-96231b3b80d8

The Apple stage2 build should include compiler-rt iOS libraries and be built with the stage2 compiler. This matches Apple's production clang builds.

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This exposes the stage2-llvm-config target though the stage1 build configuration.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@264125 91177308-0d34-0410-b5e6-96231b3b80d8

This updates Apple build configurations to adapt to r263566 & r263570, which added a PACKAGE_VENDOR variable.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263571 91177308-0d34-0410-b5e6-96231b3b80d8

This is a big update that gets the public configurations more in line with the ones we're actually using internally to ship Clang in Xcode.

From here forward I expect most of the changes in these files to be incremental as the changes get made internally.

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This patch causes the 3-stage build pipeline to only build a host compiler in the first stage, and to build all targets for subsequent stages. The host target is determined via the Native target specifier added in r262070.

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ClangConfig requires LLVMConfig, so add find_package call in
ClangConfig so find_package(clang REQUIRED CONFIG) will just work.  This
makes it easier for cmake based projects to use clang, e.g., tools using
ClangTooling.

Patch by Don Hinton

Differential Revision: http://reviews.llvm.org/D13622

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Duh! With this change I've verified -O3 builds are deterministic.

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I had hoped this would work from a single cache file, but turns out there is a bug I can't quite figure out relating to passing list arguments to recursive CMake invocations.

This change works around that.

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This is in response to silvas' post-commit suggestion.

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This cache file can be used to generate a 3-stage clang build. You can configure using the following CMake command:

cmake -C <path to clang>/cmake/caches/3-stage.cmake -G Ninja <path to llvm>

You can then run "ninja stage3-clang" to build stage1, stage2 and stage3 clangs.

This is useful for finding non-determinism the compiler by verifying that stage2 and stage3 are identical.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260201 91177308-0d34-0410-b5e6-96231b3b80d8

Summary:
This patch adds support for the clang multi-stage bootstrapping to support PGO profdata generation, and can build a 2 or 3 stage compiler.

With this patch applied you can configure your build directory with the following invocation of CMake:

cmake -G <generator> -C <path_to_clang>/cmake/caches/PGO.cmake <source dir>

After configuration the following additional targets will be generated:

stage2-instrumented:
Builds a stage1 x86 compiler, runtime, and required tools (llvm-config, llvm-profdata) then uses that compiler to build an instrumented stage2 compiler.

stage2-instrumented-generate-profdata:
Depends on "stage2-instrumented" and will use the instrumented compiler to generate profdata based on the training files in <clang>/utils/perf-training

stage2:
Depends on "stage2-instrumented-generate-profdata" and will use the stage1 compiler with the stage2 profdata to build a PGO-optimized compiler.

stage2-check-llvm:
Depends on stage2 and runs check-llvm using the stage3 compiler.

stage2-check-clang:
Depends on stage2 and runs check-clang using the stage3 compiler.

stage2-check-all:
Depends on stage2 and runs check-all using the stage3 compiler.

stage2-test-suite:
Depends on stage2 and runs the test-suite using the stage3 compiler (requires in-tree test-suite).

Reviewers: bogner, silvas, chandlerc

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D15584

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@256873 91177308-0d34-0410-b5e6-96231b3b80d8

This reverts commit r256069, which was an unintentional tag along on
another commit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@256088 91177308-0d34-0410-b5e6-96231b3b80d8

Summary:
This patch adds support for the clang multi-stage bootstrapping to support PGO profdata generation, and can build a 2 or 3 stage compiler.

With this patch applied you can configure your build directory with the following invocation of CMake:

cmake -G <generator> -C <path_to_clang>/cmake/caches/PGO.cmake <source dir>

After configuration the following additional targets will be generated:

stage2-instrumented:
Builds a stage1 x86 compiler, runtime, and required tools (llvm-config, llvm-profdata) then uses that compiler to build an instrumented stage2 compiler.

stage2-instrumented-generate-profdata:
Depends on "stage2-instrumented" and will use the instrumented compiler to generate profdata based on the training files in <clang>/utils/perf-training

stage2:
Depends on "stage2-instrumented-generate-profdata" and will use the stage1 compiler with the stage2 profdata to build a PGO-optimized compiler.

stage2-check-llvm:
Depends on stage2 and runs check-llvm using the stage3 compiler.

stage2-check-clang:
Depends on stage2 and runs check-clang using the stage3 compiler.

stage2-check-all:
Depends on stage2 and runs check-all using the stage3 compiler.

stage2-test-suite:
Depends on stage2 and runs the test-suite using the stage3 compiler (requires in-tree test-suite).

Reviewers: bogner, silvas, chandlerc

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D15584

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@256069 91177308-0d34-0410-b5e6-96231b3b80d8