premake/util/sdl_check_compile.lua
author Sam Lantinga <slouken@libsdl.org>
Sat, 02 Jan 2016 10:10:34 -0800
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parent 9619 b94b6d0bff0f
permissions -rwxr-xr-x
Updated copyright to 2016
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f67cf37e9cd4 Updated copyright to 2016
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-- Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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--
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-- This software is provided 'as-is', without any express or implied
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-- warranty.  In no event will the authors be held liable for any damages
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-- arising from the use of this software.
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--
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-- Permission is granted to anyone to use this software for any purpose,
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-- including commercial applications, and to alter it and redistribute it
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-- freely.
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--
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-- Meta-build system using premake created and maintained by
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-- Benjamin Henning <b.henning@digipen.edu>
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--[[
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sdl_check_compile.lua
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	This file provides various utility functions which allow the meta-build
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	system to perform more complex dependency checking than premake initially
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	allows. This is done using the (currently) GCC toolchain to build generated
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	C files which try to import certain headers, link to certain functions, link
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	to certain libraries, or a combination of the above. It supports providing a
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	custom source to try and build, link, and/or run per the implementation's
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	choice, so the possibilities are nearly endless with that this system is
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	capable of, though it could always do with more flexibility.
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]]
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local cxx = "gcc"
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local cxx_flags = ""
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local cxx_io_flags = "-o premakecheck.o -c premakecheck.c 2> /dev/null"
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local cxx_includes = { }
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local link = "gcc"
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local link_flags = ""
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local link_io_flags = "-o premakecheck.out premakecheck.o"
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local link_end = " 2> /dev/null"
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local run = "./premakecheck.out"
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local run_flags = ""
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local run_io_flags = " > ./premakecheck.stdout"
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local checked_printf = false
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local has_printf = false
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-- Set the application used to compile the generated files.
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function set_cxx(compiler)
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	cxx = compiler
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end
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-- Set custom flags for the compiler.
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function set_cxx_flags(flags)
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	cxx_flags = flags
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end
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-- Include a search directory for libraries.
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local function include_library_dir(dir)
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	link_flags = link_flags .. "-L" .. dir .. " "
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end
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-- Include a library to be linked durnig the link step.
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local function link_library(lib)
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	link_flags = link_flags .. "-l" .. lib .. " "
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end
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-- Reset the link flags.
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local function reset_link_flags()
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	link_flags = ""
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end
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-- Creates the build command line to be executed.
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local function build_compile_line()
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	return cxx .. " " .. cxx_flags .. " " .. cxx_io_flags
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end
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-- Creates the link command line to be executed.
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local function build_link_line()
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	return link .. " " .. link_io_flags .. " " .. link_flags .. link_end
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end
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-- Create the run line to be executed.
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local function build_run_line()
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	return run .. " " .. run_flags .. " " .. run_io_flags
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end
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-- Builds a list of preprocessor include directives for all the include files
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-- successfully found so far by these functions, so as to perform automatic
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-- feature checking for the clientside code.
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local function build_includes()
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	local includes = ""
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	for _,v in ipairs(cxx_includes) do
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		includes = includes .. '#include "' .. v .. '"\n'
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	end
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	return includes
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end
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-- Cleanup the generated build environment.
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local function cleanup_build()
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	os.remove("./premakecheck.c")
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	os.remove("./premakecheck.o")
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	os.remove("./premakecheck.out")
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	os.remove("./premakecheck.stdout")
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end
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-- Check if a source builds, links, and or/runs, where running depends on
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-- linking and linking depends on building. The return from this function is
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-- a triple, where the first is a boolean value indicating if it successfully
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-- was built, the second is a boolean value indicating if it successfully
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-- linked, and the third represents nil if it was not run or run correctly, or
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-- the output from the program executed (may be empty for no output).
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local function check_build_source(source, link, run)
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	local file = fileopen("./premakecheck.c", "wt")
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	file:write(source)
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	file:close()
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	local result = os.execute(build_compile_line())
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	if not link then
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		cleanup_build()
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		if result == 0 then
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			return true, false, nil -- compile, no link, no run
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		end
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		return false, false, nil -- no compile, no link, no run
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	end
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	-- try linking, too
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	if result ~= 0 then
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		-- can't link if it doesn't compile
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		cleanup_build()
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		return false, false, nil -- no compile, no link, no run
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	end
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	result = os.execute(build_link_line())
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	if not run or result ~= 0 then -- have to link to run
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		cleanup_build()
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		return true, result == 0, nil -- compile, maybe link, no run
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	end
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	result = os.execute(build_run_line())
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	local output = readfile("./premakecheck.stdout", "rt")
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	cleanup_build()
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	return true, true, output -- compile, link, ran
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end
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-- Given C source code, determine whether the source code will compile in the
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-- present environment. Returns true if the source was successfully compiled, or
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-- false if otherwise.
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function check_cxx_source_compiles(source)
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	local r1, _, __ = check_build_source(source, false, false)
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	return r1
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end
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-- Given C source code, determine whether the source code can be built into a
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-- working executable. That is, it will check if the code both compiles and
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-- links. Returns true if the code was successfully built (compiled and linked),
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-- or false if otherwise.
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function check_cxx_source_builds(source)
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	local r1, r2, _ = check_build_source(source, true, false)
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	return r1 and r2
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end
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-- Given C source code, attempt to compile, link, and execute the source code.
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-- This function will return two values. The first is a boolean indicating
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-- whether the source code was successfully run (meaning it was compiled, built,
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-- and ran successfully), and the second value returned is the actual output
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-- from running the application, or nil if it did not run correctly or was not
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-- built. The output may be an empty string if the code does not print anything
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-- to stdout.
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function check_cxx_source_runs(source)
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	local r1, r2, r3 = check_build_source(source, true, true)
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	return r1 and r2 and (r3 ~= nil), r3
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end
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-- Given a header file, check whether the header file is visible to the compiler
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-- in the given environment. Returns a boolean indicating thus. If a header file
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-- is found in either of these functions, it will be added to a list of headers
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-- that can be used in subsequent dependency checks.
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function check_include_file(inc)
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	return check_include_files(inc)
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end
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-- Given a variable list of header files, check whether all of the includes are
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-- visible in the given environment. Every file must be included in order for
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-- this function to return true.
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function check_include_files(...)
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	local source = ""
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	for _, v in ipairs{...} do
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		source = source .. '#include "' .. v .. '"\n'
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	end
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	local result = check_cxx_source_compiles(source)
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	if result then
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		for _, v in ipairs{...} do
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			table.insert(cxx_includes, v)
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		end
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	end
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	return result
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end
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-- Given a directory, determine whether the directory contains any header files.
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-- Unfortunately it does assume the extension is .h, but this can be altered in
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-- future versions of this software. The function returns true if the directory
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-- (or any of its subdirectories) contain .h files, or false if otherwise (such
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-- as if the directory does not exist).
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function check_include_directory(incDir)
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	incDir = incDir:gsub("\\", "/"):gsub("//", "/")
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	if incDir:sub(#incDir, #incDir) ~= "/" then
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		incDir = incDir .. "/"
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	end
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	return #os.matchfiles(incDir .. "**.h") > 0
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end
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-- Given a variable list of directories, iteratively check if each one contains
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-- header files, per the functionality of check_include_directory. This function
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-- returns true if and only if every listed directory or its subdirectories
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-- contain .h files.
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function check_include_directories(...)
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	for _, v in ipairs{...} do
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		if not check_include_directory(v) then
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			return false
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		end
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	end
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	return true
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end
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-- Given a function name, attempt to determine whether the function can be found
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-- within all of the known include files. Known include files are derived from
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-- the check_include_file(s) functions.
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function check_function_exists(func)
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	local source = build_includes()
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	source = source .. 'int main(int argc, char **argv) {\n'
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	source = source .. '\tvoid *check = (void *) ' .. func .. ';\n'
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	source = source .. '\treturn 0;\n'
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	return check_cxx_source_builds(source .. '}')
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end
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-- Given a library, a function that must exist within the library, and an
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-- include file prototyping the function, this function determines whether those
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-- three variables are able to build a working executable. That is, if a
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-- function can be properly linked to using a given library, then the library
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-- can be assumed to exist. Returns true if and only if the function was
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-- correctly linked to.
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function check_library_exists(lib, func, inc)
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	local source = build_includes()
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	if inc ~= nil then
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		source = source .. '#include "' .. inc .. '"\n'
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	end
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	source = source .. 'int main(int argc, char **argv) {\n'
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	source = source .. '\tvoid *check = (void *) ' .. func .. ';\n'
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	source = source .. '\treturn 0;\n'
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	if lib ~= nil then
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		link_library(lib)
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	end
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	local result = check_cxx_source_builds(source .. '}')
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	reset_link_flags()
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	return result
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end
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-- This is a merge variable list version of the check_library_exists function.
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-- The thing to note with this function is that it will return true for the
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-- first library found to correctly link to the function. This function is used
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-- to determine whether the function is found in a list of libraries, not if it
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-- is found in every one of the libraries.
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function check_library_exists_multiple(func, inc, ...)
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	for _,v in ipairs{...} do
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		if check_library_exists(v, func, inc) then
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			return true
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		end
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	end
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	return false
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end
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-- This is a wrapper for the check_library_exists function that will also
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-- attempt to locate the library in question, in case it's not in a path the
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-- compiler is already aware of. This function has the same return consequences
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-- as check_library_exists.
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function check_library_exists_lookup(lib, func, inc)
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	local dir = os.findlib(lib)
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	if dir == nil then
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		return false
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	end
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	include_library_dir(dir)
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	return check_library_exists(lib, func, inc)
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end
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-- Given a valid C type name, this function generates a program that will print
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-- the size of the type using the sizeof operator to the console, then parse the
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-- size to indicate the byte size of the type on this platform. The resulting
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-- executable is dependent on stdio and the printf function, which it safely
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-- checks for behind the scenes. If these dependencies are not found for
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-- whatever reason, this function returns 0, otherwise it returns a proper
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-- numerical value representing the size of the specified type.
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function check_type_size(typename)
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	if not checked_printf then
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		checked_printf = true
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		has_printf = check_include_file("stdio.h") and check_function_exists("printf")
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		if not has_printf then
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			print("Warning: cannot check the size of a type without stdio and printf.")
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		end
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	end
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	if not has_printf then
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		return 0
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	end
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	local source = '#include "stdio.h"\n'
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	source = source .. 'int main(int argc, char **argv) {\n'
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	source = source .. '\tprintf("%d", sizeof(' .. typename .. '));\n'
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	source = source .. '\treturn 0;\n'
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	local success, result = check_cxx_source_runs(source .. '}');
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	if not success then
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		print("Warning: could not get the size of type: " .. typename)
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		return 0
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	end
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	return tonumber(result)
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end