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This patch simplifies writing of standalone Clang tools. As an
example, we add clang-check, a tool that runs a syntax only frontend
action over a .cc file. When you integrate this into your favorite
editor, you get much faster feedback on your compilation errors, thus
reducing your feedback cycle especially when writing new code.

The tool depends on integration of an outstanding patch to CMake to
work which allows you to always have a current compile command
database in your cmake output directory when you set
CMAKE_EXPORT_COMPILE_COMMANDS.

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This removes the final dependency edge from any lib outside of CodeGen
to core.  As a result we can, and do, trim the dependency on core
from libclang, PrintFunctionNames, the unit tests and c-index-test.
While at it, review and trim other unneeded dependencies.

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[analyzer] Introduce libclangStaticAnalyzerFrontend and move Checkers/AnalysisConsumer.cpp into Frontend lib.

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Split 'include/clang/StaticAnalyzer' into 'include/clang/StaticAnalyzer/Core' and 'include/clang/StaticAnalyzer/Checkers'.

This layout matches lib/StaticAnalyzer, which corresponds to two StaticAnalyzer libraries.

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to the static analyzer).

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layout.  :)

Rename the 'EntoSA' directories to 'StaticAnalyzer'.

Internally we will still use the 'ento' namespace
for the analyzer engine (unless there are further
sabre rattlings...).

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update Makefile.

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[analyzer] Refactoring: Move checkers into lib/GR/Checkers and their own library, libclangGRCheckers

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Turns out that we may end up calling dladdr on GetExecutablePath, give it external linkage to make sure the lookup works on all platforms.


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Rename 'MaxLoop' to 'MaxVisit' in AnalysisManager to more correctly reflect that we aborted analysis may not necessarily be due to a loop.

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This reverts commit r113631

Conflicts:

	CMakeLists.txt
	lib/CodeGen/CMakeLists.txt

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of whatever we were using before...

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clang-interpreter: libFrontend depends on libSerialization. Fix linux build by changing the link order.


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for use in reporting diagnostics.
 - We don't want to use the Action's own CompilerInstance, because that is only
   initialized during file processing and I like that invariant.

Also, if ParseArgs returns false then abandon execution.

Also, remove unused PluginASTAction::PrintHelp virtual method.

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Also, don't link in all the clang libraries statically.


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