diff --git a/linux-x64/clang/include/llvm-c/lto.h b/linux-x64/clang/include/llvm-c/lto.h
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+/*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This header provides public interface to an abstract link time optimization*|
+|* library.  LLVM provides an implementation of this interface for use with   *|
+|* llvm bitcode files.                                                        *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#ifndef LLVM_C_LTO_H
+#define LLVM_C_LTO_H
+
+#ifdef __cplusplus
+#include <cstddef>
+#else
+#include <stddef.h>
+#endif
+#include <sys/types.h>
+
+#ifndef __cplusplus
+#if !defined(_MSC_VER)
+#include <stdbool.h>
+typedef bool lto_bool_t;
+#else
+/* MSVC in particular does not have anything like _Bool or bool in C, but we can
+   at least make sure the type is the same size.  The implementation side will
+   use C++ bool. */
+typedef unsigned char lto_bool_t;
+#endif
+#else
+typedef bool lto_bool_t;
+#endif
+
+/**
+ * @defgroup LLVMCLTO LTO
+ * @ingroup LLVMC
+ *
+ * @{
+ */
+
+#define LTO_API_VERSION 22
+
+/**
+ * \since prior to LTO_API_VERSION=3
+ */
+typedef enum {
+    LTO_SYMBOL_ALIGNMENT_MASK              = 0x0000001F, /* log2 of alignment */
+    LTO_SYMBOL_PERMISSIONS_MASK            = 0x000000E0,
+    LTO_SYMBOL_PERMISSIONS_CODE            = 0x000000A0,
+    LTO_SYMBOL_PERMISSIONS_DATA            = 0x000000C0,
+    LTO_SYMBOL_PERMISSIONS_RODATA          = 0x00000080,
+    LTO_SYMBOL_DEFINITION_MASK             = 0x00000700,
+    LTO_SYMBOL_DEFINITION_REGULAR          = 0x00000100,
+    LTO_SYMBOL_DEFINITION_TENTATIVE        = 0x00000200,
+    LTO_SYMBOL_DEFINITION_WEAK             = 0x00000300,
+    LTO_SYMBOL_DEFINITION_UNDEFINED        = 0x00000400,
+    LTO_SYMBOL_DEFINITION_WEAKUNDEF        = 0x00000500,
+    LTO_SYMBOL_SCOPE_MASK                  = 0x00003800,
+    LTO_SYMBOL_SCOPE_INTERNAL              = 0x00000800,
+    LTO_SYMBOL_SCOPE_HIDDEN                = 0x00001000,
+    LTO_SYMBOL_SCOPE_PROTECTED             = 0x00002000,
+    LTO_SYMBOL_SCOPE_DEFAULT               = 0x00001800,
+    LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
+    LTO_SYMBOL_COMDAT                      = 0x00004000,
+    LTO_SYMBOL_ALIAS                       = 0x00008000
+} lto_symbol_attributes;
+
+/**
+ * \since prior to LTO_API_VERSION=3
+ */
+typedef enum {
+    LTO_DEBUG_MODEL_NONE         = 0,
+    LTO_DEBUG_MODEL_DWARF        = 1
+} lto_debug_model;
+
+/**
+ * \since prior to LTO_API_VERSION=3
+ */
+typedef enum {
+    LTO_CODEGEN_PIC_MODEL_STATIC         = 0,
+    LTO_CODEGEN_PIC_MODEL_DYNAMIC        = 1,
+    LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2,
+    LTO_CODEGEN_PIC_MODEL_DEFAULT        = 3
+} lto_codegen_model;
+
+/** opaque reference to a loaded object module */
+typedef struct LLVMOpaqueLTOModule *lto_module_t;
+
+/** opaque reference to a code generator */
+typedef struct LLVMOpaqueLTOCodeGenerator *lto_code_gen_t;
+
+/** opaque reference to a thin code generator */
+typedef struct LLVMOpaqueThinLTOCodeGenerator *thinlto_code_gen_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Returns a printable string.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern const char*
+lto_get_version(void);
+
+/**
+ * Returns the last error string or NULL if last operation was successful.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern const char*
+lto_get_error_message(void);
+
+/**
+ * Checks if a file is a loadable object file.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_module_is_object_file(const char* path);
+
+/**
+ * Checks if a file is a loadable object compiled for requested target.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_module_is_object_file_for_target(const char* path,
+                                     const char* target_triple_prefix);
+
+/**
+ * Return true if \p Buffer contains a bitcode file with ObjC code (category
+ * or class) in it.
+ *
+ * \since LTO_API_VERSION=20
+ */
+extern lto_bool_t
+lto_module_has_objc_category(const void *mem, size_t length);
+
+/**
+ * Checks if a buffer is a loadable object file.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t lto_module_is_object_file_in_memory(const void *mem,
+                                                      size_t length);
+
+/**
+ * Checks if a buffer is a loadable object compiled for requested target.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length,
+                                              const char* target_triple_prefix);
+
+/**
+ * Loads an object file from disk.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_module_t
+lto_module_create(const char* path);
+
+/**
+ * Loads an object file from memory.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_module_t
+lto_module_create_from_memory(const void* mem, size_t length);
+
+/**
+ * Loads an object file from memory with an extra path argument.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=9
+ */
+extern lto_module_t
+lto_module_create_from_memory_with_path(const void* mem, size_t length,
+                                        const char *path);
+
+/**
+ * \brief Loads an object file in its own context.
+ *
+ * Loads an object file in its own LLVMContext.  This function call is
+ * thread-safe.  However, modules created this way should not be merged into an
+ * lto_code_gen_t using \a lto_codegen_add_module().
+ *
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=11
+ */
+extern lto_module_t
+lto_module_create_in_local_context(const void *mem, size_t length,
+                                   const char *path);
+
+/**
+ * \brief Loads an object file in the codegen context.
+ *
+ * Loads an object file into the same context as \c cg.  The module is safe to
+ * add using \a lto_codegen_add_module().
+ *
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=11
+ */
+extern lto_module_t
+lto_module_create_in_codegen_context(const void *mem, size_t length,
+                                     const char *path, lto_code_gen_t cg);
+
+/**
+ * Loads an object file from disk. The seek point of fd is not preserved.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=5
+ */
+extern lto_module_t
+lto_module_create_from_fd(int fd, const char *path, size_t file_size);
+
+/**
+ * Loads an object file from disk. The seek point of fd is not preserved.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=5
+ */
+extern lto_module_t
+lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size,
+                                    size_t map_size, off_t offset);
+
+/**
+ * Frees all memory internally allocated by the module.
+ * Upon return the lto_module_t is no longer valid.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern void
+lto_module_dispose(lto_module_t mod);
+
+/**
+ * Returns triple string which the object module was compiled under.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern const char*
+lto_module_get_target_triple(lto_module_t mod);
+
+/**
+ * Sets triple string with which the object will be codegened.
+ *
+ * \since LTO_API_VERSION=4
+ */
+extern void
+lto_module_set_target_triple(lto_module_t mod, const char *triple);
+
+/**
+ * Returns the number of symbols in the object module.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern unsigned int
+lto_module_get_num_symbols(lto_module_t mod);
+
+/**
+ * Returns the name of the ith symbol in the object module.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern const char*
+lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
+
+/**
+ * Returns the attributes of the ith symbol in the object module.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_symbol_attributes
+lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
+
+/**
+ * Returns the module's linker options.
+ *
+ * The linker options may consist of multiple flags. It is the linker's
+ * responsibility to split the flags using a platform-specific mechanism.
+ *
+ * \since LTO_API_VERSION=16
+ */
+extern const char*
+lto_module_get_linkeropts(lto_module_t mod);
+
+/**
+ * Diagnostic severity.
+ *
+ * \since LTO_API_VERSION=7
+ */
+typedef enum {
+  LTO_DS_ERROR = 0,
+  LTO_DS_WARNING = 1,
+  LTO_DS_REMARK = 3, // Added in LTO_API_VERSION=10.
+  LTO_DS_NOTE = 2
+} lto_codegen_diagnostic_severity_t;
+
+/**
+ * Diagnostic handler type.
+ * \p severity defines the severity.
+ * \p diag is the actual diagnostic.
+ * The diagnostic is not prefixed by any of severity keyword, e.g., 'error: '.
+ * \p ctxt is used to pass the context set with the diagnostic handler.
+ *
+ * \since LTO_API_VERSION=7
+ */
+typedef void (*lto_diagnostic_handler_t)(
+    lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt);
+
+/**
+ * Set a diagnostic handler and the related context (void *).
+ * This is more general than lto_get_error_message, as the diagnostic handler
+ * can be called at anytime within lto.
+ *
+ * \since LTO_API_VERSION=7
+ */
+extern void lto_codegen_set_diagnostic_handler(lto_code_gen_t,
+                                               lto_diagnostic_handler_t,
+                                               void *);
+
+/**
+ * Instantiates a code generator.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ * All modules added using \a lto_codegen_add_module() must have been created
+ * in the same context as the codegen.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_code_gen_t
+lto_codegen_create(void);
+
+/**
+ * \brief Instantiate a code generator in its own context.
+ *
+ * Instantiates a code generator in its own context.  Modules added via \a
+ * lto_codegen_add_module() must have all been created in the same context,
+ * using \a lto_module_create_in_codegen_context().
+ *
+ * \since LTO_API_VERSION=11
+ */
+extern lto_code_gen_t
+lto_codegen_create_in_local_context(void);
+
+/**
+ * Frees all code generator and all memory it internally allocated.
+ * Upon return the lto_code_gen_t is no longer valid.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern void
+lto_codegen_dispose(lto_code_gen_t);
+
+/**
+ * Add an object module to the set of modules for which code will be generated.
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \c cg and \c mod must both be in the same context.  See \a
+ * lto_codegen_create_in_local_context() and \a
+ * lto_module_create_in_codegen_context().
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod);
+
+/**
+ * Sets the object module for code generation. This will transfer the ownership
+ * of the module to the code generator.
+ *
+ * \c cg and \c mod must both be in the same context.
+ *
+ * \since LTO_API_VERSION=13
+ */
+extern void
+lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod);
+
+/**
+ * Sets if debug info should be generated.
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model);
+
+/**
+ * Sets which PIC code model to generated.
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern lto_bool_t
+lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model);
+
+/**
+ * Sets the cpu to generate code for.
+ *
+ * \since LTO_API_VERSION=4
+ */
+extern void
+lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu);
+
+/**
+ * Sets the location of the assembler tool to run. If not set, libLTO
+ * will use gcc to invoke the assembler.
+ *
+ * \since LTO_API_VERSION=3
+ */
+extern void
+lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
+
+/**
+ * Sets extra arguments that libLTO should pass to the assembler.
+ *
+ * \since LTO_API_VERSION=4
+ */
+extern void
+lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
+                               int nargs);
+
+/**
+ * Adds to a list of all global symbols that must exist in the final generated
+ * code. If a function is not listed there, it might be inlined into every usage
+ * and optimized away.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern void
+lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol);
+
+/**
+ * Writes a new object file at the specified path that contains the
+ * merged contents of all modules added so far.
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=5
+ */
+extern lto_bool_t
+lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path);
+
+/**
+ * Generates code for all added modules into one native object file.
+ * This calls lto_codegen_optimize then lto_codegen_compile_optimized.
+ *
+ * On success returns a pointer to a generated mach-o/ELF buffer and
+ * length set to the buffer size.  The buffer is owned by the
+ * lto_code_gen_t and will be freed when lto_codegen_dispose()
+ * is called, or lto_codegen_compile() is called again.
+ * On failure, returns NULL (check lto_get_error_message() for details).
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern const void*
+lto_codegen_compile(lto_code_gen_t cg, size_t* length);
+
+/**
+ * Generates code for all added modules into one native object file.
+ * This calls lto_codegen_optimize then lto_codegen_compile_optimized (instead
+ * of returning a generated mach-o/ELF buffer, it writes to a file).
+ *
+ * The name of the file is written to name. Returns true on error.
+ *
+ * \since LTO_API_VERSION=5
+ */
+extern lto_bool_t
+lto_codegen_compile_to_file(lto_code_gen_t cg, const char** name);
+
+/**
+ * Runs optimization for the merged module. Returns true on error.
+ *
+ * \since LTO_API_VERSION=12
+ */
+extern lto_bool_t
+lto_codegen_optimize(lto_code_gen_t cg);
+
+/**
+ * Generates code for the optimized merged module into one native object file.
+ * It will not run any IR optimizations on the merged module.
+ *
+ * On success returns a pointer to a generated mach-o/ELF buffer and length set
+ * to the buffer size.  The buffer is owned by the lto_code_gen_t and will be
+ * freed when lto_codegen_dispose() is called, or
+ * lto_codegen_compile_optimized() is called again. On failure, returns NULL
+ * (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=12
+ */
+extern const void*
+lto_codegen_compile_optimized(lto_code_gen_t cg, size_t* length);
+
+/**
+ * Returns the runtime API version.
+ *
+ * \since LTO_API_VERSION=12
+ */
+extern unsigned int
+lto_api_version(void);
+
+/**
+ * Sets options to help debug codegen bugs.
+ *
+ * \since prior to LTO_API_VERSION=3
+ */
+extern void
+lto_codegen_debug_options(lto_code_gen_t cg, const char *);
+
+/**
+ * Initializes LLVM disassemblers.
+ * FIXME: This doesn't really belong here.
+ *
+ * \since LTO_API_VERSION=5
+ */
+extern void
+lto_initialize_disassembler(void);
+
+/**
+ * Sets if we should run internalize pass during optimization and code
+ * generation.
+ *
+ * \since LTO_API_VERSION=14
+ */
+extern void
+lto_codegen_set_should_internalize(lto_code_gen_t cg,
+                                   lto_bool_t ShouldInternalize);
+
+/**
+ * \brief Set whether to embed uselists in bitcode.
+ *
+ * Sets whether \a lto_codegen_write_merged_modules() should embed uselists in
+ * output bitcode.  This should be turned on for all -save-temps output.
+ *
+ * \since LTO_API_VERSION=15
+ */
+extern void
+lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
+                                      lto_bool_t ShouldEmbedUselists);
+
+/**
+ * @} // endgoup LLVMCLTO
+ * @defgroup LLVMCTLTO ThinLTO
+ * @ingroup LLVMC
+ *
+ * @{
+ */
+
+/**
+ * Type to wrap a single object returned by ThinLTO.
+ *
+ * \since LTO_API_VERSION=18
+ */
+typedef struct {
+  const char *Buffer;
+  size_t Size;
+} LTOObjectBuffer;
+
+/**
+ * Instantiates a ThinLTO code generator.
+ * Returns NULL on error (check lto_get_error_message() for details).
+ *
+ *
+ * The ThinLTOCodeGenerator is not intended to be reuse for multiple
+ * compilation: the model is that the client adds modules to the generator and
+ * ask to perform the ThinLTO optimizations / codegen, and finally destroys the
+ * codegenerator.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern thinlto_code_gen_t thinlto_create_codegen(void);
+
+/**
+ * Frees the generator and all memory it internally allocated.
+ * Upon return the thinlto_code_gen_t is no longer valid.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_dispose(thinlto_code_gen_t cg);
+
+/**
+ * Add a module to a ThinLTO code generator. Identifier has to be unique among
+ * all the modules in a code generator. The data buffer stays owned by the
+ * client, and is expected to be available for the entire lifetime of the
+ * thinlto_code_gen_t it is added to.
+ *
+ * On failure, returns NULL (check lto_get_error_message() for details).
+ *
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_add_module(thinlto_code_gen_t cg,
+                                       const char *identifier, const char *data,
+                                       int length);
+
+/**
+ * Optimize and codegen all the modules added to the codegenerator using
+ * ThinLTO. Resulting objects are accessible using thinlto_module_get_object().
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_process(thinlto_code_gen_t cg);
+
+/**
+ * Returns the number of object files produced by the ThinLTO CodeGenerator.
+ *
+ * It usually matches the number of input files, but this is not a guarantee of
+ * the API and may change in future implementation, so the client should not
+ * assume it.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg);
+
+/**
+ * Returns a reference to the ith object file produced by the ThinLTO
+ * CodeGenerator.
+ *
+ * Client should use \p thinlto_module_get_num_objects() to get the number of
+ * available objects.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
+                                                 unsigned int index);
+
+/**
+ * Returns the number of object files produced by the ThinLTO CodeGenerator.
+ *
+ * It usually matches the number of input files, but this is not a guarantee of
+ * the API and may change in future implementation, so the client should not
+ * assume it.
+ *
+ * \since LTO_API_VERSION=21
+ */
+unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg);
+
+/**
+ * Returns the path to the ith object file produced by the ThinLTO
+ * CodeGenerator.
+ *
+ * Client should use \p thinlto_module_get_num_object_files() to get the number
+ * of available objects.
+ *
+ * \since LTO_API_VERSION=21
+ */
+const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
+                                           unsigned int index);
+
+/**
+ * Sets which PIC code model to generate.
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
+                                                lto_codegen_model);
+
+/**
+ * Sets the path to a directory to use as a storage for temporary bitcode files.
+ * The intention is to make the bitcode files available for debugging at various
+ * stage of the pipeline.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
+                                              const char *save_temps_dir);
+
+/**
+ * Set the path to a directory where to save generated object files. This
+ * path can be used by a linker to request on-disk files instead of in-memory
+ * buffers. When set, results are available through
+ * thinlto_module_get_object_file() instead of thinlto_module_get_object().
+ *
+ * \since LTO_API_VERSION=21
+ */
+void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
+                                       const char *save_temps_dir);
+
+/**
+ * Sets the cpu to generate code for.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu);
+
+/**
+ * Disable CodeGen, only run the stages till codegen and stop. The output will
+ * be bitcode.
+ *
+ * \since LTO_API_VERSION=19
+ */
+extern void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
+                                            lto_bool_t disable);
+
+/**
+ * Perform CodeGen only: disable all other stages.
+ *
+ * \since LTO_API_VERSION=19
+ */
+extern void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
+                                             lto_bool_t codegen_only);
+
+/**
+ * Parse -mllvm style debug options.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_debug_options(const char *const *options, int number);
+
+/**
+ * Test if a module has support for ThinLTO linking.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern lto_bool_t lto_module_is_thinlto(lto_module_t mod);
+
+/**
+ * Adds a symbol to the list of global symbols that must exist in the final
+ * generated code. If a function is not listed there, it might be inlined into
+ * every usage and optimized away. For every single module, the functions
+ * referenced from code outside of the ThinLTO modules need to be added here.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
+                                                     const char *name,
+                                                     int length);
+
+/**
+ * Adds a symbol to the list of global symbols that are cross-referenced between
+ * ThinLTO files. If the ThinLTO CodeGenerator can ensure that every
+ * references from a ThinLTO module to this symbol is optimized away, then
+ * the symbol can be discarded.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
+                                                        const char *name,
+                                                        int length);
+
+/**
+ * @} // endgoup LLVMCTLTO
+ * @defgroup LLVMCTLTO_CACHING ThinLTO Cache Control
+ * @ingroup LLVMCTLTO
+ *
+ * These entry points control the ThinLTO cache. The cache is intended to
+ * support incremental builds, and thus needs to be persistent across builds.
+ * The client enables the cache by supplying a path to an existing directory.
+ * The code generator will use this to store objects files that may be reused
+ * during a subsequent build.
+ * To avoid filling the disk space, a few knobs are provided:
+ *  - The pruning interval limits the frequency at which the garbage collector
+ *    will try to scan the cache directory to prune expired entries.
+ *    Setting to a negative number disables the pruning.
+ *  - The pruning expiration time indicates to the garbage collector how old an
+ *    entry needs to be to be removed.
+ *  - Finally, the garbage collector can be instructed to prune the cache until
+ *    the occupied space goes below a threshold.
+ * @{
+ */
+
+/**
+ * Sets the path to a directory to use as a cache storage for incremental build.
+ * Setting this activates caching.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
+                                          const char *cache_dir);
+
+/**
+ * Sets the cache pruning interval (in seconds). A negative value disables the
+ * pruning. An unspecified default value will be applied, and a value of 0 will
+ * force prunning to occur.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
+                                                       int interval);
+
+/**
+ * Sets the maximum cache size that can be persistent across build, in terms of
+ * percentage of the available space on the disk. Set to 100 to indicate
+ * no limit, 50 to indicate that the cache size will not be left over half the
+ * available space. A value over 100 will be reduced to 100, a value of 0 will
+ * be ignored. An unspecified default value will be applied.
+ *
+ * The formula looks like:
+ *  AvailableSpace = FreeSpace + ExistingCacheSize
+ *  NewCacheSize = AvailableSpace * P/100
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_final_cache_size_relative_to_available_space(
+    thinlto_code_gen_t cg, unsigned percentage);
+
+/**
+ * Sets the expiration (in seconds) for an entry in the cache. An unspecified
+ * default value will be applied. A value of 0 will be ignored.
+ *
+ * \since LTO_API_VERSION=18
+ */
+extern void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
+                                                       unsigned expiration);
+
+/**
+ * Sets the maximum size of the cache directory (in bytes). A value over the
+ * amount of available space on the disk will be reduced to the amount of
+ * available space. An unspecified default value will be applied. A value of 0
+ * will be ignored.
+ *
+ * \since LTO_API_VERSION=22
+ */
+extern void thinlto_codegen_set_cache_size_bytes(thinlto_code_gen_t cg,
+                                                 unsigned max_size_bytes);
+
+/**
+ * Sets the maximum number of files in the cache directory. An unspecified
+ * default value will be applied. A value of 0 will be ignored.
+ *
+ * \since LTO_API_VERSION=22
+ */
+extern void thinlto_codegen_set_cache_size_files(thinlto_code_gen_t cg,
+                                                 unsigned max_size_files);
+
+
+
+/**
+ * @} // endgroup LLVMCTLTO_CACHING
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LLVM_C_LTO_H */