iff	AST_COMMON
hdr	pthread,stdarg,stddef,stdint,inttypes,types,unistd
sys	types
typ	long.double,size_t,ssize_t
typ	__va_list stdio.h

std	noreturn note{ noreturn ok }end compile{
	#include <stdlib.h>
	#include <stdnoreturn.h>
	noreturn void foo(void) { exit(0); }
	int main(void) { foo(); }
}end

cat{
	#if __clang__
	#pragma clang diagnostic ignored "-Wmissing-braces"
	#pragma clang diagnostic ignored "-Wparentheses"
	#pragma clang diagnostic ignored "-Wstring-plus-int"
	#pragma clang diagnostic ignored "-Wunused-value"
	#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
	#pragma GCC diagnostic ignored "-Wmissing-braces"
	#pragma GCC diagnostic ignored "-Wparentheses"
	#pragma GCC diagnostic ignored "-Wunused-result"
	#pragma GCC diagnostic ignored "-Wunused-value"
	#endif

	/* AST backward compatibility macros */
	#undef	_NIL_
	#define	_NIL_(x)	NULL
	#undef	_STD_
	#define	_STD_		1
	#undef	_ARG_
	#define	_ARG_(x)	x
	#undef	_VOID_
	#define	_VOID_		void
	#undef	_BEGIN_EXTERNS_
	#define	_BEGIN_EXTERNS_
	#undef	_END_EXTERNS_
	#define	_END_EXTERNS_
	#undef __EXTERN__
	#define __EXTERN__(T,obj)	extern T obj
	#undef __DEFINE__
	#define __DEFINE__(T,obj,val)	T obj = val
	#undef	__STD_C
	#define	__STD_C		1
	#undef	Void_t
	#define	Void_t		void

	/* __INLINE__, if defined, is the inline keyword */
	#if !defined(__INLINE__) && defined(_WIN32) && !defined(__GNUC__)
	#	define __INLINE__	__inline
	#endif

	/* Windows variants and veneers */
	/* (as of 2022-07-21, only Cygwin) */
	#if !defined(_WINIX) && __CYGWIN__
	#	define _WINIX		1
	#endif

	/* dynamic linked library external scope handling */
	#ifdef __DYNAMIC__
	#	undef	__DYNAMIC__
	#	ifndef _DLL
	#		define _DLL		1
	#	endif
	#endif

	#if !_std_noreturn
	#if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4))
	/*
	 * Note: Cygwin needs noreturn to be __noreturn__ to avoid
	 * a build failure when using -std=c99.
	 */
	#define noreturn __attribute__((__noreturn__))
	#else
	#define noreturn
	#endif /* __GNUC__ */
	#else
	#include <stdnoreturn.h>
	#endif /* _std_noreturn */
}end

if	tst - note{ <stdarg.h>+<wchar.h> works }end compile{
		/*<NOSTDIO>*/
		#include <stdarg.h>
		#include <wchar.h>
	}end 
elif	tst - note{ explicit <sys/va_list.h> before <stdarg.h>+<wchar.h> }end compile{
		/*<NOSTDIO>*/
		#include <sys/va_list.h>
		#include <stdarg.h>
		#include <wchar.h>
	}end {
		#include <sys/va_list.h>
	}
endif

tst	ast_LL note{ LL numeric suffix supported }end compile{
	int i = 1LL;
	unsigned int u = 1ULL; /* NOTE: some compilers choke on 1LLU */
}end

tst	- -DN=1 - -DN=2 - -DN=3 - -DN=4 - -DN=5 - -DN=6 - -DN=7 - -DN=8 - -DN=0 output{
	#define _BYTESEX_H

	#include <string.h>
	#include <sys/types.h>

	#if N == 1
	#define _ast_int8_t	long
	#define _ast_int8_str	"long"
	#endif
	#if N == 2
	#define _ast_int8_t	long long
	#define _ast_int8_str	"long long"
	#endif
	#if N == 3
	#define _ast_int8_t	__int64
	#define _ast_int8_str	"__int64"
	#endif
	#if N == 4
	#define _ast_int8_t	__int64_t
	#define _ast_int8_str	"__int64_t"
	#endif
	#if N == 5
	#define _ast_int8_t	_int64_t
	#define _ast_int8_str	"_int64_t"
	#endif
	#if N == 6
	#define _ast_int8_t	int64_t
	#define _ast_int8_str	"int64_t"
	#endif
	#if N == 7
	#define _ast_int8_t	_int64
	#define _ast_int8_str	"_int64"
	#endif
	#if N == 8
	#define _ast_int8_t	int64
	#define _ast_int8_str	"int64"
	#endif

	#define elementsof(x)	(sizeof(x)/sizeof(x[0]))
	
	static char			i_char = 1;
	static short			i_short = 1;
	static int			i_int = 1;
	static long			i_long = 1L;
	#ifdef _ast_int8_t
	#if _ast_LL
	static _ast_int8_t		i_long_long = 1LL;
	static unsigned _ast_int8_t	u_long_long = 18446744073709551615ULL;
	#else
	static _ast_int8_t		i_long_long = 1;
	static unsigned _ast_int8_t	u_long_long = 18446744073709551615;
	#endif
	#endif
	
	static struct
	{
		char*	name;
		int	size;
		char*	swap;
	} int_type[] = 
	{
		"char",		sizeof(char),		(char*)&i_char,
		"short",	sizeof(short),		(char*)&i_short,
		"int",		sizeof(int),		(char*)&i_int,
		"long",		sizeof(long),		(char*)&i_long,
	#ifdef _ast_int8_t
		_ast_int8_str,	sizeof(_ast_int8_t),	(char*)&i_long_long,
	#endif
	};
	
	static int	int_size[] = { 1, 2, 4, 8 };
	
	int
	main(void)
	{
		int	t;
		int	s;
		int	m = 1;
		int	b = 1;
		int	w = 0;
	
	#ifdef _ast_int8_t
		unsigned _ast_int8_t	p;
		char			buf[64];

		if (int_type[elementsof(int_type)-1].size <= 4)
			return 1;
		p = 0x12345678;
		p <<= 32;
		p |= 0x9abcdef0;
		sprintf(buf, "0x%016llx", p);
		if (strcmp(buf, "0x123456789abcdef0"))
			return 1;
	#endif
		for (s = 0; s < elementsof(int_size); s++)
		{
			for (t = 0; t < elementsof(int_type) && int_type[t].size < int_size[s]; t++);
			if (t < elementsof(int_type))
			{
				m = int_size[s];
	#if __INTERIX
				if (m == 8)
				{
					printf("#ifdef _MSC_VER\n");
					printf("#define _ast_int8_t	__int64\n");
					printf("#else\n");
					printf("#define _ast_int8_t	long long\n");
					printf("#endif\n");
				}
				else
	#endif
				printf("#define _ast_int%d_t		%s\n", m, int_type[t].name);
				if (m > 1)
				{
					if (*int_type[t].swap)
						w |= b;
					b <<= 1;
				}
			}
		}
		printf("#define _ast_intmax_t		_ast_int%d_t\n", m);
		if (m == sizeof(long))
			printf("#define _ast_intmax_long		1\n");
		printf("#define _ast_intswap		%d\n", w);
		printf("\n");
		return 0;
	}
}end

tst	- output{
	#include <string.h>
	#include <sys/types.h>

	#if _X86_ || _X64_ 
	#define COND		1
	#define CONDNAME	"_X64_"
	#else
	#define COND		0
	#endif

	#define elementsof(x)	(sizeof(x)/sizeof(x[0]))
	
	static struct
	{
		char*	name;
		int	size;
		int	cond;
	} types[] = 
	{
		"short",	sizeof(short),		0,
		"int",		sizeof(int),		0,
		"long",		sizeof(long),		0,
		"size_t",	sizeof(size_t),		0,
		"pointer",	sizeof(void*),		COND * 4,
		"float",	sizeof(float),		0,
		"double",	sizeof(double),		0,
	#if _typ_long_double
		"long_double",	sizeof(long double),	0,
	#endif
	};
	
	int
	main(void)
	{
		int	t;

		for (t = 0; t < elementsof(types); t++)
	#if COND
			if (types[t].cond)
			{
				printf("#if %s\n", CONDNAME);
				printf("#define _ast_sizeof_%s%s	%d	/* sizeof(%s) */\n", types[t].name, strlen(types[t].name) < 4 ? "\t" : "", types[t].cond * 2, types[t].name);
				printf("#else\n");
				printf("#define _ast_sizeof_%s%s	%d	/* sizeof(%s) */\n", types[t].name, strlen(types[t].name) < 4 ? "\t" : "", types[t].cond, types[t].name);
				printf("#endif\n");
			}
			else
	#endif
				printf("#define _ast_sizeof_%s%s	%d	/* sizeof(%s) */\n", types[t].name, strlen(types[t].name) < 4 ? "\t" : "", types[t].size, types[t].name);
		printf("\n");
		return 0;
	}
}end fail{
	echo "$0: Output block failed to compile. Export IFFEFLAGS=-d1 to debug." >&2
	exit 1
}end

tst	- -DN=1 - -DN=0 output{
	#define _BYTESEX_H

	#include <string.h>
	#include <sys/types.h>

	#if !N
	#undef	_typ_long_double
	#endif

	#define elementsof(x)	(sizeof(x)/sizeof(x[0]))
	
	static struct
	{
		char*	name;
		int	size;
	} flt_type[] = 
	{
		"float",	sizeof(float),
		"double",	sizeof(double),
	#if _typ_long_double
		"long double",	sizeof(long double),
	#endif
	};
	
	int
	main(void)
	{
		int	t;
		int	m = 1;
	
	#if _typ_long_double
		long double	p;
		char		buf[64];

		if (flt_type[elementsof(flt_type)-1].size <= sizeof(double))
			return 1;
		p = 1.12345E-55;
		sprintf(buf, "%1.5LE", p);
		if (strcmp(buf, "1.12345E-55"))
			return 1;
	#endif
		for (t = 0; t < elementsof(flt_type); t++)
		{
			while (t < (elementsof(flt_type) - 1) && flt_type[t].size == flt_type[t + 1].size)
				t++;
			m = flt_type[t].size;
			printf("#define _ast_flt%d_t		%s\n", flt_type[t].size, flt_type[t].name);
		}
		printf("#define _ast_fltmax_t		_ast_flt%d_t\n", m);
		if (m == sizeof(double))
			printf("#define _ast_fltmax_double		1\n");
		return 0;
	}
}end

typ int8_t stdint.h inttypes.h no{
	#undef	_typ_int8_t
	#define	_typ_int8_t	1
	typedef _ast_int1_t int8_t;
}end
typ uint8_t stdint.h inttypes.h no{
	#undef	_typ_uint8_t
	#define	_typ_uint8_t	1
	typedef unsigned _ast_int1_t uint8_t;
}end
typ int16_t stdint.h inttypes.h no{
	#undef	_typ_int16_t
	#define	_typ_int16_t	1
	typedef _ast_int2_t int16_t;
}end
typ uint16_t stdint.h inttypes.h no{
	#undef	_typ_uint16_t
	#define	_typ_uint16_t	1
	typedef unsigned _ast_int2_t uint16_t;
}end
typ int32_t stdint.h inttypes.h no{
	#undef	_typ_int32_t
	#define	_typ_int32_t	1
	typedef _ast_int4_t int32_t;
}end
typ uint32_t stdint.h inttypes.h no{
	#undef	_typ_uint32_t
	#define	_typ_uint32_t	1
	typedef unsigned _ast_int4_t uint32_t;
}end
typ int64_t stdint.h inttypes.h no{
	#ifdef _ast_int8_t
	#undef	_typ_int64_t
	#define	_typ_int64_t	1
	typedef _ast_int8_t int64_t;
	#endif
}end
typ uint64_t stdint.h inttypes.h no{
	#ifdef _ast_int8_t
	#undef	_typ_uint64_t
	#define	_typ_uint64_t	1
	typedef unsigned _ast_int8_t uint64_t;
	#endif
}end
typ intmax_t stdint.h inttypes.h no{
	#undef	_typ_intmax_t
	#define	_typ_intmax_t	1
	typedef _ast_intmax_t intmax_t;
}end
typ intptr_t stdint.h inttypes.h no{
	#undef	_typ_intptr_t
	#define	_typ_intptr_t	1
	#if _ast_sizeof_pointer == 8 && defined(_ast_int8_t)
	typedef _ast_int8_t intptr_t;
	#else
	typedef _ast_int4_t intptr_t;
	#endif
}end
typ uintmax_t stdint.h inttypes.h no{
	#undef	_typ_uintmax_t
	#define	_typ_uintmax_t	1
	typedef unsigned _ast_intmax_t uintmax_t;
}end
typ uintptr_t stdint.h inttypes.h no{
	#undef	_typ_uintptr_t
	#define	_typ_uintptr_t	1
	#if _ast_sizeof_pointer == 8 && defined(_ast_int8_t)
	typedef unsigned _ast_int8_t uintptr_t;
	#else
	typedef unsigned _ast_int4_t uintptr_t;
	#endif
}end

tst	- -DTRY=1 - -DTRY=1 -Dvoid=char - -DTRY=2 - -DTRY=3 - -DTRY=4 output{
	#if _hdr_stdarg
	#include <stdarg.h>
	static void
	varyfunny(int* p, ...)
	{
		va_list	ap;
		va_start(ap, p);
	#if TRY == 1
		*p = *ap++ != 0;
	#endif /*TRY == 1*/
	#if TRY == 2
		*p = *ap != 0;
	#endif /*TRY == 2*/
	#if TRY == 3
		*p = ap++ != 0;
	#endif /*TRY == 3*/
		va_end(ap);
	}
	#else
	#include <varargs.h>
	static void
	varyfunny(va_alist)
	va_dcl
	{
		va_list	ap;
		int*	p;
		va_start(ap);
		p = va_arg(ap, int*);
	#if TRY == 1
		*p = *ap++ != 0;
	#endif /*TRY == 1*/
	#if TRY == 2
		*p = *ap != 0;
	#endif /*TRY == 2*/
	#if TRY == 3
		*p = ap++ != 0;
	#endif /*TRY == 3*/
		va_end(ap);
	}
	#endif
	int
	main(void)
	{
		int	r;

		printf("\n#ifndef va_listref\n");
		printf("#ifndef	va_start\n");
		printf("#include <stdarg.h>\n");
		printf("#endif\n");
	#if TRY == 4
		printf("#define va_listref(p) (&(p))\t");
			printf("/* pass va_list to varargs function */\n");
		printf("#define va_listval(p) (*(p))\t");
			printf("/* retrieve va_list from va_arg(ap,va_listarg) */\n");
		printf("#define va_listarg va_list*\t");
			printf("/* va_arg() va_list type */\n");
	#else
		varyfunny(&r);
		printf("#define va_listref(p) (p)\t");
			printf("/* pass va_list to varargs function */\n");
		if (sizeof(va_list) > sizeof(void*))
			printf("#define va_listval(p) (*(p))\t");
		else
			printf("#define va_listval(p) (p)\t");
			printf("/* retrieve va_list from va_arg(ap,va_listarg) */\n");
	#if TRY == 2
		printf("#define va_listarg va_list*\t");
	#else
		printf("#define va_listarg va_list\t");
	#endif /*TRY == 2*/
			printf("/* va_arg() va_list type */\n");
	#endif /*TRY == 4*/
	
	#if !defined(va_copy)
	#if defined(__va_copy)
		printf("#ifndef va_copy\n");
		printf("#define va_copy(to,fr) __va_copy(to,fr)\t");
			printf("/* copy va_list fr -> to */\n");
		printf("#endif\n");
	#else
	#if TRY == 2
		printf("#ifndef va_copy\n");
		printf("#define va_copy(to,fr) memcpy(to,fr,sizeof(va_list))\t");
			printf("/* copy va_list fr -> to */\n");
		printf("#endif\n");
	#else
		printf("#ifndef va_copy\n");
		printf("#define va_copy(to,fr) ((to)=(fr))\t");
			printf("/* copy va_list fr -> to */\n");
		printf("#endif\n");
	#endif
	#endif
	#endif
	
		printf("#endif\n");
		return 0;
	}
}end

cat{
	#ifndef _AST_STD_H
	#	if _hdr_stddef
	#	include	<stddef.h>
	#	endif
	#	if _sys_types
	#	include	<sys/types.h>
	#	endif
	#	if _hdr_stdint
	#	include	<stdint.h>
	#	else
	#		if _hdr_inttypes
	#		include	<inttypes.h>
	#		endif
	#	endif
	#endif
	#if !_typ_size_t
	#	define _typ_size_t	1
		typedef int size_t;
	#endif
	#if !_typ_ssize_t
	#	define _typ_ssize_t	1
		typedef int ssize_t;
	#endif
	#ifndef _AST_STD_H
	#	define _def_map_ast	1
	#	if !_def_map_ast
	#		include <ast_map.h>
	#	endif
	#endif
}end

run{
	grep __NO_INCLUDE_WARN__ /usr/include/stat.h >/dev/null 2>&1 &&
	grep '<name.h>' /usr/include/sys/stat.h >/dev/null 2>&1 &&
	grep __name_h /usr/include/name.h >/dev/null 2>&1 &&
	cat <<!
	/* disable ${HOSTTYPE} <sys/foo.h> vs. <foo.h> clash warnings */
	#ifndef __NO_INCLUDE_WARN__
	#define __NO_INCLUDE_WARN__	1
	#endif
	/* disable ${HOSTTYPE} <sys/stat.h> <name.h> hijack */
	#ifndef __name_h
	#define __name_h		1
	#endif
	!
}end

tst - note{ does this compiler have __builtin_unreachable() }end output{
	/*
	 * To avoid optimizing out the __builtin_unreachable() test call while also avoiding
	 * executing it, put it in a test function that is called with argc as the argument.
	 * argc should never be zero on init, but hopefully optimizers aren't that smart.
	 */
	#include <stdio.h>
	#include "releaseflags.h"
	void testfn(int a)
	{
		switch(a)
		{
		case 0:
			__builtin_unreachable();
		default:
	#if _AST_release
			printf("#   define UNREACHABLE()\t__builtin_unreachable()\n");
	#else
			printf("#   define UNREACHABLE()\tabort()\n");
	#endif
		}
	}
	int main(int argc, char *argv[])
	{
		testfn(argc);
		return 0;
	}
}end fail{
	echo '#define UNREACHABLE()	abort()'
}end
