New jit API entrypoint: gcc_jit_context_compile_to_file

New jit API entrypoint: gcc_jit_context_compile_to_file

gcc/jit/ChangeLog:
	* docs/cp/topics/results.rst: Rename to...
	* docs/cp/topics/compilation.rst: ...this, and add section on
	ahead-of-time compilation.
	* docs/cp/topics/index.rst: Update for renaming of results.rst
	to compilation.rst.
	* docs/examples/emit-alphabet.bf: New file, a sample "brainf"
	script.
	* docs/examples/tut05-bf.c: New file, implementing a compiler
	for "brainf".
	* docs/internals/test-hello-world.exe.log.txt: Update to reflect
	changes to logger output.
	* docs/intro/index.rst: Add tutorial05.rst
	* docs/intro/tutorial05.rst: New file.
	* docs/topics/results.rst: Rename to...
	* docs/topics/compilation.rst: ...this, and add section on
	ahead-of-time compilation.
	* docs/topics/index.rst: Update for renaming of results.rst to
	compilation.rst.
	* jit-playback.c (gcc::jit::playback::context::compile): Convert
	return type from result * to void.  Move the code to convert to
	dso and dlopen the result to a new pure virtual "postprocess"
	method.
	(gcc::jit::playback::compile_to_memory::compile_to_memory): New
	function.
	(gcc::jit::playback::compile_to_memory::postprocess): New
	function, based on playback::context::compile.
	(gcc::jit::playback::compile_to_file::compile_to_file): New
	function.
	(gcc::jit::playback::compile_to_file::postprocess): New function.
	(gcc::jit::playback::compile_to_file::copy_file): New function.
	(gcc::jit::playback::context::convert_to_dso): Move internals
	to...
	(gcc::jit::playback::context::invoke_driver): New method.  Add
	"-shared" and "-c" options to driver's argv as needed.
	* jit-playback.h: Include "timevar.h".
	(gcc::jit::playback::context::compile): Convert return type from
	result * to void.
	(gcc::jit::playback::context::postprocess): New pure virtual
	function, making this an abstract base class.
	(gcc::jit::playback::context::get_tempdir): New accessor.
	(gcc::jit::playback::context::invoke_driver): New function.
	(class gcc::jit::playback::compile_to_memory): New subclass of
	playback::context.
	(class gcc::jit::playback::compile_to_file): Likewise.
	* jit-recording.c (gcc::jit::recording::context::compile): Use a
	playback::compile_to_memory, and extract its result.
	(gcc::jit::recording::context::compile_to_file): New function.
	* jit-recording.h (gcc::jit::recording::context::compile_to_file):
	New function.
	* libgccjit++.h (gccjit::context::compile_to_file): New method.
	* libgccjit.c (gcc_jit_context_compile): Update log message to
	clarify that this is an in-memory compile.
	(gcc_jit_context_compile_to_file): New function.
	* libgccjit.h (gcc_jit_context): Clarify that you can compile
	a context more than once, and that you can compile to a file
	as well as to memory.
	(gcc_jit_result): Clarify that this is the result of an
	in-memory compilation.
	(gcc_jit_context_compile): Clarify that you can compile, and that
	this is an in-memory compilation.
	(enum gcc_jit_output_kind): New enum.
	(gcc_jit_context_compile_to_file): New function.
	(gcc_jit_context_enable_dump): Clarify comment to cover both forms
	of compilation.
	* libgccjit.map (gcc_jit_context_compile_to_file): New API
	entrypoint.
	* notes.txt: Update to show the playback::context::postprocess
	virtual function.

gcc/testsuite/ChangeLog:
	* jit.dg/harness.h: Include <unistd.h>.
	(CHECK_NO_ERRORS): New.
	(verify_code): Wrap prototype in #ifndef TEST_COMPILING_TO_FILE.
	(test_jit): Support new macro TEST_COMPILING_TO_FILE for exercising
	gcc_jit_context_compile_to_file.
	* jit.dg/jit.exp (fixed_host_execute): Fix the code for passing on
	args to the spawned executable.
	(jit-expand-vars): New function.
	(jit-exe-params): New variable.
	(dg-jit-set-exe-params): New function.
	(jit-dg-test): Detect testcases that use
	jit-verify-compile-to-file and call jit-setup-compile-to-file.
	Set arguments of spawned process to jit-exe-params.
	(jit-get-output-filename): New function.
	(jit-setup-compile-to-file): New function.
	(jit-verify-compile-to-file): New function.
	(jit-run-executable): New function.
	(jit-verify-executable): New function.
	* jit.dg/test-compile-to-assembler.c: New testcase.
	* jit.dg/test-compile-to-dynamic-library.c: New testcase.
	* jit.dg/test-compile-to-executable.c: New testcase.
	* jit.dg/test-compile-to-object.c: New testcase.

From-SVN: r219876