1dnl $Id: aclocal.m4,v 1.30 2013/03/05 01:13:39 tom Exp $
2dnl Macros for byacc configure script (Thomas E. Dickey)
3dnl ---------------------------------------------------------------------------
4dnl Copyright 2004-2012,2013 Thomas E. Dickey
5dnl 
6dnl Permission is hereby granted, free of charge, to any person obtaining a
7dnl copy of this software and associated documentation files (the
8dnl "Software"), to deal in the Software without restriction, including
9dnl without limitation the rights to use, copy, modify, merge, publish,
10dnl distribute, distribute with modifications, sublicense, and/or sell
11dnl copies of the Software, and to permit persons to whom the Software is
12dnl furnished to do so, subject to the following conditions:
13dnl 
14dnl The above copyright notice and this permission notice shall be included
15dnl in all copies or portions of the Software.
16dnl 
17dnl THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18dnl OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19dnl MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20dnl IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
21dnl DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
22dnl OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
23dnl THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24dnl 
25dnl Except as contained in this notice, the name(s) of the above copyright
26dnl holders shall not be used in advertising or otherwise to promote the
27dnl sale, use or other dealings in this Software without prior written
28dnl authorization.
29dnl ---------------------------------------------------------------------------
30dnl ---------------------------------------------------------------------------
31dnl CF_ACVERSION_CHECK version: 4 updated: 2013/03/04 19:52:56
32dnl ------------------
33dnl Conditionally generate script according to whether we're using a given autoconf.
34dnl
35dnl $1 = version to compare against
36dnl $2 = code to use if AC_ACVERSION is at least as high as $1.
37dnl $3 = code to use if AC_ACVERSION is older than $1.
38define([CF_ACVERSION_CHECK],
39[
40ifdef([AC_ACVERSION], ,[m4_copy([m4_PACKAGE_VERSION],[AC_ACVERSION])])dnl
41ifdef([m4_version_compare],
42[m4_if(m4_version_compare(m4_defn([AC_ACVERSION]), [$1]), -1, [$3], [$2])],
43[CF_ACVERSION_COMPARE(
44AC_PREREQ_CANON(AC_PREREQ_SPLIT([$1])),
45AC_PREREQ_CANON(AC_PREREQ_SPLIT(AC_ACVERSION)), AC_ACVERSION, [$2], [$3])])])dnl
46dnl ---------------------------------------------------------------------------
47dnl CF_ACVERSION_COMPARE version: 3 updated: 2012/10/03 18:39:53
48dnl --------------------
49dnl CF_ACVERSION_COMPARE(MAJOR1, MINOR1, TERNARY1,
50dnl                      MAJOR2, MINOR2, TERNARY2,
51dnl                      PRINTABLE2, not FOUND, FOUND)
52define([CF_ACVERSION_COMPARE],
53[ifelse(builtin([eval], [$2 < $5]), 1,
54[ifelse([$8], , ,[$8])],
55[ifelse([$9], , ,[$9])])])dnl
56dnl ---------------------------------------------------------------------------
57dnl CF_ADD_CFLAGS version: 10 updated: 2010/05/26 05:38:42
58dnl -------------
59dnl Copy non-preprocessor flags to $CFLAGS, preprocessor flags to $CPPFLAGS
60dnl The second parameter if given makes this macro verbose.
61dnl
62dnl Put any preprocessor definitions that use quoted strings in $EXTRA_CPPFLAGS,
63dnl to simplify use of $CPPFLAGS in compiler checks, etc., that are easily
64dnl confused by the quotes (which require backslashes to keep them usable).
65AC_DEFUN([CF_ADD_CFLAGS],
66[
67cf_fix_cppflags=no
68cf_new_cflags=
69cf_new_cppflags=
70cf_new_extra_cppflags=
71
72for cf_add_cflags in $1
73do
74case $cf_fix_cppflags in
75no)
76	case $cf_add_cflags in #(vi
77	-undef|-nostdinc*|-I*|-D*|-U*|-E|-P|-C) #(vi
78		case $cf_add_cflags in
79		-D*)
80			cf_tst_cflags=`echo ${cf_add_cflags} |sed -e 's/^-D[[^=]]*='\''\"[[^"]]*//'`
81
82			test "${cf_add_cflags}" != "${cf_tst_cflags}" \
83				&& test -z "${cf_tst_cflags}" \
84				&& cf_fix_cppflags=yes
85
86			if test $cf_fix_cppflags = yes ; then
87				cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
88				continue
89			elif test "${cf_tst_cflags}" = "\"'" ; then
90				cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
91				continue
92			fi
93			;;
94		esac
95		case "$CPPFLAGS" in
96		*$cf_add_cflags) #(vi
97			;;
98		*) #(vi
99			case $cf_add_cflags in #(vi
100			-D*)
101				cf_tst_cppflags=`echo "x$cf_add_cflags" | sed -e 's/^...//' -e 's/=.*//'`
102				CF_REMOVE_DEFINE(CPPFLAGS,$CPPFLAGS,$cf_tst_cppflags)
103				;;
104			esac
105			cf_new_cppflags="$cf_new_cppflags $cf_add_cflags"
106			;;
107		esac
108		;;
109	*)
110		cf_new_cflags="$cf_new_cflags $cf_add_cflags"
111		;;
112	esac
113	;;
114yes)
115	cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
116
117	cf_tst_cflags=`echo ${cf_add_cflags} |sed -e 's/^[[^"]]*"'\''//'`
118
119	test "${cf_add_cflags}" != "${cf_tst_cflags}" \
120		&& test -z "${cf_tst_cflags}" \
121		&& cf_fix_cppflags=no
122	;;
123esac
124done
125
126if test -n "$cf_new_cflags" ; then
127	ifelse([$2],,,[CF_VERBOSE(add to \$CFLAGS $cf_new_cflags)])
128	CFLAGS="$CFLAGS $cf_new_cflags"
129fi
130
131if test -n "$cf_new_cppflags" ; then
132	ifelse([$2],,,[CF_VERBOSE(add to \$CPPFLAGS $cf_new_cppflags)])
133	CPPFLAGS="$CPPFLAGS $cf_new_cppflags"
134fi
135
136if test -n "$cf_new_extra_cppflags" ; then
137	ifelse([$2],,,[CF_VERBOSE(add to \$EXTRA_CPPFLAGS $cf_new_extra_cppflags)])
138	EXTRA_CPPFLAGS="$cf_new_extra_cppflags $EXTRA_CPPFLAGS"
139fi
140
141AC_SUBST(EXTRA_CPPFLAGS)
142
143])dnl
144dnl ---------------------------------------------------------------------------
145dnl CF_ARG_DISABLE version: 3 updated: 1999/03/30 17:24:31
146dnl --------------
147dnl Allow user to disable a normally-on option.
148AC_DEFUN([CF_ARG_DISABLE],
149[CF_ARG_OPTION($1,[$2],[$3],[$4],yes)])dnl
150dnl ---------------------------------------------------------------------------
151dnl CF_ARG_OPTION version: 4 updated: 2010/05/26 05:38:42
152dnl -------------
153dnl Restricted form of AC_ARG_ENABLE that ensures user doesn't give bogus
154dnl values.
155dnl
156dnl Parameters:
157dnl $1 = option name
158dnl $2 = help-string
159dnl $3 = action to perform if option is not default
160dnl $4 = action if perform if option is default
161dnl $5 = default option value (either 'yes' or 'no')
162AC_DEFUN([CF_ARG_OPTION],
163[AC_ARG_ENABLE([$1],[$2],[test "$enableval" != ifelse([$5],no,yes,no) && enableval=ifelse([$5],no,no,yes)
164  if test "$enableval" != "$5" ; then
165ifelse([$3],,[    :]dnl
166,[    $3]) ifelse([$4],,,[
167  else
168    $4])
169  fi],[enableval=$5 ifelse([$4],,,[
170  $4
171])dnl
172  ])])dnl
173dnl ---------------------------------------------------------------------------
174dnl CF_CC_ENV_FLAGS version: 1 updated: 2012/10/03 05:25:49
175dnl ---------------
176dnl Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
177dnl into CC.  This will not help with broken scripts that wrap the compiler with
178dnl options, but eliminates a more common category of user confusion.
179AC_DEFUN([CF_CC_ENV_FLAGS],
180[
181# This should have been defined by AC_PROG_CC
182: ${CC:=cc}
183
184AC_MSG_CHECKING(\$CC variable)
185case "$CC" in #(vi
186*[[\ \	]]-[[IUD]]*)
187	AC_MSG_RESULT(broken)
188	AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
189	# humor him...
190	cf_flags=`echo "$CC" | sed -e 's/^[[^ 	]]*[[ 	]]//'`
191	CC=`echo "$CC" | sed -e 's/[[ 	]].*//'`
192	CF_ADD_CFLAGS($cf_flags)
193	;;
194*)
195	AC_MSG_RESULT(ok)
196	;;
197esac
198])dnl
199dnl ---------------------------------------------------------------------------
200dnl CF_CHECK_CACHE version: 12 updated: 2012/10/02 20:55:03
201dnl --------------
202dnl Check if we're accidentally using a cache from a different machine.
203dnl Derive the system name, as a check for reusing the autoconf cache.
204dnl
205dnl If we've packaged config.guess and config.sub, run that (since it does a
206dnl better job than uname).  Normally we'll use AC_CANONICAL_HOST, but allow
207dnl an extra parameter that we may override, e.g., for AC_CANONICAL_SYSTEM
208dnl which is useful in cross-compiles.
209dnl
210dnl Note: we would use $ac_config_sub, but that is one of the places where
211dnl autoconf 2.5x broke compatibility with autoconf 2.13
212AC_DEFUN([CF_CHECK_CACHE],
213[
214if test -f $srcdir/config.guess || test -f $ac_aux_dir/config.guess ; then
215	ifelse([$1],,[AC_CANONICAL_HOST],[$1])
216	system_name="$host_os"
217else
218	system_name="`(uname -s -r) 2>/dev/null`"
219	if test -z "$system_name" ; then
220		system_name="`(hostname) 2>/dev/null`"
221	fi
222fi
223test -n "$system_name" && AC_DEFINE_UNQUOTED(SYSTEM_NAME,"$system_name",[Define to the system name.])
224AC_CACHE_VAL(cf_cv_system_name,[cf_cv_system_name="$system_name"])
225
226test -z "$system_name" && system_name="$cf_cv_system_name"
227test -n "$cf_cv_system_name" && AC_MSG_RESULT(Configuring for $cf_cv_system_name)
228
229if test ".$system_name" != ".$cf_cv_system_name" ; then
230	AC_MSG_RESULT(Cached system name ($system_name) does not agree with actual ($cf_cv_system_name))
231	AC_MSG_ERROR("Please remove config.cache and try again.")
232fi
233])dnl
234dnl ---------------------------------------------------------------------------
235dnl CF_CLANG_COMPILER version: 1 updated: 2012/06/16 14:55:39
236dnl -----------------
237dnl Check if the given compiler is really clang.  clang's C driver defines
238dnl __GNUC__ (fooling the configure script into setting $GCC to yes) but does
239dnl not ignore some gcc options.
240dnl
241dnl This macro should be run "soon" after AC_PROG_CC or AC_PROG_CPLUSPLUS, to
242dnl ensure that it is not mistaken for gcc/g++.  It is normally invoked from
243dnl the wrappers for gcc and g++ warnings.
244dnl
245dnl $1 = GCC (default) or GXX
246dnl $2 = INTEL_COMPILER (default) or INTEL_CPLUSPLUS
247dnl $3 = CFLAGS (default) or CXXFLAGS
248AC_DEFUN([CF_CLANG_COMPILER],[
249ifelse([$2],,CLANG_COMPILER,[$2])=no
250
251if test "$ifelse([$1],,[$1],GCC)" = yes ; then
252	AC_MSG_CHECKING(if this is really Clang ifelse([$1],GXX,C++,C) compiler)
253	cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
254	ifelse([$3],,CFLAGS,[$3])="$ifelse([$3],,CFLAGS,[$3]) -Qunused-arguments"
255	AC_TRY_COMPILE([],[
256#ifdef __clang__
257#else
258make an error
259#endif
260],[ifelse([$2],,CLANG_COMPILER,[$2])=yes
261cf_save_CFLAGS="$cf_save_CFLAGS -Qunused-arguments"
262],[])
263	ifelse([$3],,CFLAGS,[$3])="$cf_save_CFLAGS"
264	AC_MSG_RESULT($ifelse([$2],,CLANG_COMPILER,[$2]))
265fi
266])
267dnl ---------------------------------------------------------------------------
268dnl CF_DISABLE_ECHO version: 12 updated: 2012/10/06 16:30:28
269dnl ---------------
270dnl You can always use "make -n" to see the actual options, but it's hard to
271dnl pick out/analyze warning messages when the compile-line is long.
272dnl
273dnl Sets:
274dnl	ECHO_LT - symbol to control if libtool is verbose
275dnl	ECHO_LD - symbol to prefix "cc -o" lines
276dnl	RULE_CC - symbol to put before implicit "cc -c" lines (e.g., .c.o)
277dnl	SHOW_CC - symbol to put before explicit "cc -c" lines
278dnl	ECHO_CC - symbol to put before any "cc" line
279dnl
280AC_DEFUN([CF_DISABLE_ECHO],[
281AC_MSG_CHECKING(if you want to see long compiling messages)
282CF_ARG_DISABLE(echo,
283	[  --disable-echo          do not display "compiling" commands],
284	[
285    ECHO_LT='--silent'
286    ECHO_LD='@echo linking [$]@;'
287    RULE_CC='@echo compiling [$]<'
288    SHOW_CC='@echo compiling [$]@'
289    ECHO_CC='@'
290],[
291    ECHO_LT=''
292    ECHO_LD=''
293    RULE_CC=''
294    SHOW_CC=''
295    ECHO_CC=''
296])
297AC_MSG_RESULT($enableval)
298AC_SUBST(ECHO_LT)
299AC_SUBST(ECHO_LD)
300AC_SUBST(RULE_CC)
301AC_SUBST(SHOW_CC)
302AC_SUBST(ECHO_CC)
303])dnl
304dnl ---------------------------------------------------------------------------
305dnl CF_DISABLE_LEAKS version: 7 updated: 2012/10/02 20:55:03
306dnl ----------------
307dnl Combine no-leak checks with the libraries or tools that are used for the
308dnl checks.
309AC_DEFUN([CF_DISABLE_LEAKS],[
310
311AC_REQUIRE([CF_WITH_DMALLOC])
312AC_REQUIRE([CF_WITH_DBMALLOC])
313AC_REQUIRE([CF_WITH_VALGRIND])
314
315AC_MSG_CHECKING(if you want to perform memory-leak testing)
316AC_ARG_ENABLE(leaks,
317	[  --disable-leaks         test: free permanent memory, analyze leaks],
318	[if test "x$enableval" = xno; then with_no_leaks=yes; else with_no_leaks=no; fi],
319	: ${with_no_leaks:=no})
320AC_MSG_RESULT($with_no_leaks)
321
322if test "$with_no_leaks" = yes ; then
323	AC_DEFINE(NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
324	AC_DEFINE(YY_NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
325fi
326])dnl
327dnl ---------------------------------------------------------------------------
328dnl CF_GCC_ATTRIBUTES version: 16 updated: 2012/10/02 20:55:03
329dnl -----------------
330dnl Test for availability of useful gcc __attribute__ directives to quiet
331dnl compiler warnings.  Though useful, not all are supported -- and contrary
332dnl to documentation, unrecognized directives cause older compilers to barf.
333AC_DEFUN([CF_GCC_ATTRIBUTES],
334[
335if test "$GCC" = yes
336then
337cat > conftest.i <<EOF
338#ifndef GCC_PRINTF
339#define GCC_PRINTF 0
340#endif
341#ifndef GCC_SCANF
342#define GCC_SCANF 0
343#endif
344#ifndef GCC_NORETURN
345#define GCC_NORETURN /* nothing */
346#endif
347#ifndef GCC_UNUSED
348#define GCC_UNUSED /* nothing */
349#endif
350EOF
351if test "$GCC" = yes
352then
353	AC_CHECKING([for $CC __attribute__ directives])
354cat > conftest.$ac_ext <<EOF
355#line __oline__ "${as_me:-configure}"
356#include "confdefs.h"
357#include "conftest.h"
358#include "conftest.i"
359#if	GCC_PRINTF
360#define GCC_PRINTFLIKE(fmt,var) __attribute__((format(printf,fmt,var)))
361#else
362#define GCC_PRINTFLIKE(fmt,var) /*nothing*/
363#endif
364#if	GCC_SCANF
365#define GCC_SCANFLIKE(fmt,var)  __attribute__((format(scanf,fmt,var)))
366#else
367#define GCC_SCANFLIKE(fmt,var)  /*nothing*/
368#endif
369extern void wow(char *,...) GCC_SCANFLIKE(1,2);
370extern void oops(char *,...) GCC_PRINTFLIKE(1,2) GCC_NORETURN;
371extern void foo(void) GCC_NORETURN;
372int main(int argc GCC_UNUSED, char *argv[[]] GCC_UNUSED) { return 0; }
373EOF
374	cf_printf_attribute=no
375	cf_scanf_attribute=no
376	for cf_attribute in scanf printf unused noreturn
377	do
378		CF_UPPER(cf_ATTRIBUTE,$cf_attribute)
379		cf_directive="__attribute__(($cf_attribute))"
380		echo "checking for $CC $cf_directive" 1>&AC_FD_CC
381
382		case $cf_attribute in #(vi
383		printf) #(vi
384			cf_printf_attribute=yes
385			cat >conftest.h <<EOF
386#define GCC_$cf_ATTRIBUTE 1
387EOF
388			;;
389		scanf) #(vi
390			cf_scanf_attribute=yes
391			cat >conftest.h <<EOF
392#define GCC_$cf_ATTRIBUTE 1
393EOF
394			;;
395		*) #(vi
396			cat >conftest.h <<EOF
397#define GCC_$cf_ATTRIBUTE $cf_directive
398EOF
399			;;
400		esac
401
402		if AC_TRY_EVAL(ac_compile); then
403			test -n "$verbose" && AC_MSG_RESULT(... $cf_attribute)
404			cat conftest.h >>confdefs.h
405			case $cf_attribute in #(vi
406			noreturn) #(vi
407				AC_DEFINE_UNQUOTED(GCC_NORETURN,$cf_directive,[Define to noreturn-attribute for gcc])
408				;;
409			printf) #(vi
410				cf_value='/* nothing */'
411				if test "$cf_printf_attribute" != no ; then
412					cf_value='__attribute__((format(printf,fmt,var)))'
413					AC_DEFINE(GCC_PRINTF,1,[Define to 1 if the compiler supports gcc-like printf attribute.])
414				fi
415				AC_DEFINE_UNQUOTED(GCC_PRINTFLIKE(fmt,var),$cf_value,[Define to printf-attribute for gcc])
416				;;
417			scanf) #(vi
418				cf_value='/* nothing */'
419				if test "$cf_scanf_attribute" != no ; then
420					cf_value='__attribute__((format(scanf,fmt,var)))'
421					AC_DEFINE(GCC_SCANF,1,[Define to 1 if the compiler supports gcc-like scanf attribute.])
422				fi
423				AC_DEFINE_UNQUOTED(GCC_SCANFLIKE(fmt,var),$cf_value,[Define to sscanf-attribute for gcc])
424				;;
425			unused) #(vi
426				AC_DEFINE_UNQUOTED(GCC_UNUSED,$cf_directive,[Define to unused-attribute for gcc])
427				;;
428			esac
429		fi
430	done
431else
432	fgrep define conftest.i >>confdefs.h
433fi
434rm -rf conftest*
435fi
436])dnl
437dnl ---------------------------------------------------------------------------
438dnl CF_GCC_VERSION version: 7 updated: 2012/10/18 06:46:33
439dnl --------------
440dnl Find version of gcc
441AC_DEFUN([CF_GCC_VERSION],[
442AC_REQUIRE([AC_PROG_CC])
443GCC_VERSION=none
444if test "$GCC" = yes ; then
445	AC_MSG_CHECKING(version of $CC)
446	GCC_VERSION="`${CC} --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(GCC[[^)]]*) //' -e 's/^.*(Debian[[^)]]*) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
447	test -z "$GCC_VERSION" && GCC_VERSION=unknown
448	AC_MSG_RESULT($GCC_VERSION)
449fi
450])dnl
451dnl ---------------------------------------------------------------------------
452dnl CF_GCC_WARNINGS version: 29 updated: 2012/06/16 14:55:39
453dnl ---------------
454dnl Check if the compiler supports useful warning options.  There's a few that
455dnl we don't use, simply because they're too noisy:
456dnl
457dnl	-Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
458dnl	-Wredundant-decls (system headers make this too noisy)
459dnl	-Wtraditional (combines too many unrelated messages, only a few useful)
460dnl	-Wwrite-strings (too noisy, but should review occasionally).  This
461dnl		is enabled for ncurses using "--enable-const".
462dnl	-pedantic
463dnl
464dnl Parameter:
465dnl	$1 is an optional list of gcc warning flags that a particular
466dnl		application might want to use, e.g., "no-unused" for
467dnl		-Wno-unused
468dnl Special:
469dnl	If $with_ext_const is "yes", add a check for -Wwrite-strings
470dnl
471AC_DEFUN([CF_GCC_WARNINGS],
472[
473AC_REQUIRE([CF_GCC_VERSION])
474CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
475CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
476
477cat > conftest.$ac_ext <<EOF
478#line __oline__ "${as_me:-configure}"
479int main(int argc, char *argv[[]]) { return (argv[[argc-1]] == 0) ; }
480EOF
481
482if test "$INTEL_COMPILER" = yes
483then
484# The "-wdXXX" options suppress warnings:
485# remark #1419: external declaration in primary source file
486# remark #1683: explicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem)
487# remark #1684: conversion from pointer to same-sized integral type (potential portability problem)
488# remark #193: zero used for undefined preprocessing identifier
489# remark #593: variable "curs_sb_left_arrow" was set but never used
490# remark #810: conversion from "int" to "Dimension={unsigned short}" may lose significant bits
491# remark #869: parameter "tw" was never referenced
492# remark #981: operands are evaluated in unspecified order
493# warning #279: controlling expression is constant
494
495	AC_CHECKING([for $CC warning options])
496	cf_save_CFLAGS="$CFLAGS"
497	EXTRA_CFLAGS="-Wall"
498	for cf_opt in \
499		wd1419 \
500		wd1683 \
501		wd1684 \
502		wd193 \
503		wd593 \
504		wd279 \
505		wd810 \
506		wd869 \
507		wd981
508	do
509		CFLAGS="$cf_save_CFLAGS $EXTRA_CFLAGS -$cf_opt"
510		if AC_TRY_EVAL(ac_compile); then
511			test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
512			EXTRA_CFLAGS="$EXTRA_CFLAGS -$cf_opt"
513		fi
514	done
515	CFLAGS="$cf_save_CFLAGS"
516
517elif test "$GCC" = yes
518then
519	AC_CHECKING([for $CC warning options])
520	cf_save_CFLAGS="$CFLAGS"
521	EXTRA_CFLAGS=
522	cf_warn_CONST=""
523	test "$with_ext_const" = yes && cf_warn_CONST="Wwrite-strings"
524	for cf_opt in W Wall \
525		Wbad-function-cast \
526		Wcast-align \
527		Wcast-qual \
528		Winline \
529		Wmissing-declarations \
530		Wmissing-prototypes \
531		Wnested-externs \
532		Wpointer-arith \
533		Wshadow \
534		Wstrict-prototypes \
535		Wundef $cf_warn_CONST $1
536	do
537		CFLAGS="$cf_save_CFLAGS $EXTRA_CFLAGS -$cf_opt"
538		if AC_TRY_EVAL(ac_compile); then
539			test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
540			case $cf_opt in #(vi
541			Wcast-qual) #(vi
542				CPPFLAGS="$CPPFLAGS -DXTSTRINGDEFINES"
543				;;
544			Winline) #(vi
545				case $GCC_VERSION in
546				[[34]].*)
547					CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
548					continue;;
549				esac
550				;;
551			Wpointer-arith) #(vi
552				case $GCC_VERSION in
553				[[12]].*)
554					CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
555					continue;;
556				esac
557				;;
558			esac
559			EXTRA_CFLAGS="$EXTRA_CFLAGS -$cf_opt"
560		fi
561	done
562	CFLAGS="$cf_save_CFLAGS"
563fi
564rm -rf conftest*
565
566AC_SUBST(EXTRA_CFLAGS)
567])dnl
568dnl ---------------------------------------------------------------------------
569dnl CF_GNU_SOURCE version: 6 updated: 2005/07/09 13:23:07
570dnl -------------
571dnl Check if we must define _GNU_SOURCE to get a reasonable value for
572dnl _XOPEN_SOURCE, upon which many POSIX definitions depend.  This is a defect
573dnl (or misfeature) of glibc2, which breaks portability of many applications,
574dnl since it is interwoven with GNU extensions.
575dnl
576dnl Well, yes we could work around it...
577AC_DEFUN([CF_GNU_SOURCE],
578[
579AC_CACHE_CHECK(if we must define _GNU_SOURCE,cf_cv_gnu_source,[
580AC_TRY_COMPILE([#include <sys/types.h>],[
581#ifndef _XOPEN_SOURCE
582make an error
583#endif],
584	[cf_cv_gnu_source=no],
585	[cf_save="$CPPFLAGS"
586	 CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
587	 AC_TRY_COMPILE([#include <sys/types.h>],[
588#ifdef _XOPEN_SOURCE
589make an error
590#endif],
591	[cf_cv_gnu_source=no],
592	[cf_cv_gnu_source=yes])
593	CPPFLAGS="$cf_save"
594	])
595])
596test "$cf_cv_gnu_source" = yes && CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
597])dnl
598dnl ---------------------------------------------------------------------------
599dnl CF_INTEL_COMPILER version: 5 updated: 2013/02/10 10:41:05
600dnl -----------------
601dnl Check if the given compiler is really the Intel compiler for Linux.  It
602dnl tries to imitate gcc, but does not return an error when it finds a mismatch
603dnl between prototypes, e.g., as exercised by CF_MISSING_CHECK.
604dnl
605dnl This macro should be run "soon" after AC_PROG_CC or AC_PROG_CPLUSPLUS, to
606dnl ensure that it is not mistaken for gcc/g++.  It is normally invoked from
607dnl the wrappers for gcc and g++ warnings.
608dnl
609dnl $1 = GCC (default) or GXX
610dnl $2 = INTEL_COMPILER (default) or INTEL_CPLUSPLUS
611dnl $3 = CFLAGS (default) or CXXFLAGS
612AC_DEFUN([CF_INTEL_COMPILER],[
613AC_REQUIRE([AC_CANONICAL_HOST])
614ifelse([$2],,INTEL_COMPILER,[$2])=no
615
616if test "$ifelse([$1],,[$1],GCC)" = yes ; then
617	case $host_os in
618	linux*|gnu*)
619		AC_MSG_CHECKING(if this is really Intel ifelse([$1],GXX,C++,C) compiler)
620		cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
621		ifelse([$3],,CFLAGS,[$3])="$ifelse([$3],,CFLAGS,[$3]) -no-gcc"
622		AC_TRY_COMPILE([],[
623#ifdef __INTEL_COMPILER
624#else
625make an error
626#endif
627],[ifelse([$2],,INTEL_COMPILER,[$2])=yes
628cf_save_CFLAGS="$cf_save_CFLAGS -we147 -no-gcc"
629],[])
630		ifelse([$3],,CFLAGS,[$3])="$cf_save_CFLAGS"
631		AC_MSG_RESULT($ifelse([$2],,INTEL_COMPILER,[$2]))
632		;;
633	esac
634fi
635])dnl
636dnl ---------------------------------------------------------------------------
637dnl CF_MAKE_TAGS version: 6 updated: 2010/10/23 15:52:32
638dnl ------------
639dnl Generate tags/TAGS targets for makefiles.  Do not generate TAGS if we have
640dnl a monocase filesystem.
641AC_DEFUN([CF_MAKE_TAGS],[
642AC_REQUIRE([CF_MIXEDCASE_FILENAMES])
643
644AC_CHECK_PROGS(CTAGS, exctags ctags)
645AC_CHECK_PROGS(ETAGS, exetags etags)
646
647AC_CHECK_PROG(MAKE_LOWER_TAGS, ${CTAGS:-ctags}, yes, no)
648
649if test "$cf_cv_mixedcase" = yes ; then
650	AC_CHECK_PROG(MAKE_UPPER_TAGS, ${ETAGS:-etags}, yes, no)
651else
652	MAKE_UPPER_TAGS=no
653fi
654
655if test "$MAKE_UPPER_TAGS" = yes ; then
656	MAKE_UPPER_TAGS=
657else
658	MAKE_UPPER_TAGS="#"
659fi
660
661if test "$MAKE_LOWER_TAGS" = yes ; then
662	MAKE_LOWER_TAGS=
663else
664	MAKE_LOWER_TAGS="#"
665fi
666
667AC_SUBST(CTAGS)
668AC_SUBST(ETAGS)
669
670AC_SUBST(MAKE_UPPER_TAGS)
671AC_SUBST(MAKE_LOWER_TAGS)
672])dnl
673dnl ---------------------------------------------------------------------------
674dnl CF_MIXEDCASE_FILENAMES version: 4 updated: 2012/10/02 20:55:03
675dnl ----------------------
676dnl Check if the file-system supports mixed-case filenames.  If we're able to
677dnl create a lowercase name and see it as uppercase, it doesn't support that.
678AC_DEFUN([CF_MIXEDCASE_FILENAMES],
679[
680AC_CACHE_CHECK(if filesystem supports mixed-case filenames,cf_cv_mixedcase,[
681if test "$cross_compiling" = yes ; then
682	case $target_alias in #(vi
683	*-os2-emx*|*-msdosdjgpp*|*-cygwin*|*-mingw32*|*-uwin*) #(vi
684		cf_cv_mixedcase=no
685		;;
686	*)
687		cf_cv_mixedcase=yes
688		;;
689	esac
690else
691	rm -f conftest CONFTEST
692	echo test >conftest
693	if test -f CONFTEST ; then
694		cf_cv_mixedcase=no
695	else
696		cf_cv_mixedcase=yes
697	fi
698	rm -f conftest CONFTEST
699fi
700])
701test "$cf_cv_mixedcase" = yes && AC_DEFINE(MIXEDCASE_FILENAMES,1,[Define to 1 if filesystem supports mixed-case filenames.])
702])dnl
703dnl ---------------------------------------------------------------------------
704dnl CF_MKSTEMP version: 9 updated: 2012/10/03 04:34:49
705dnl ----------
706dnl Check for a working mkstemp.  This creates two files, checks that they are
707dnl successfully created and distinct (AmigaOS apparently fails on the last).
708AC_DEFUN([CF_MKSTEMP],[
709AC_CACHE_CHECK(for working mkstemp, cf_cv_func_mkstemp,[
710rm -rf conftest*
711AC_TRY_RUN([
712#include <sys/types.h>
713#include <stdlib.h>
714#include <stdio.h>
715#include <string.h>
716#include <sys/stat.h>
717int main()
718{
719	char *tmpl = "conftestXXXXXX";
720	char name[2][80];
721	int n;
722	int result = 0;
723	int fd;
724	struct stat sb;
725
726	umask(077);
727	for (n = 0; n < 2; ++n) {
728		strcpy(name[n], tmpl);
729		if ((fd = mkstemp(name[n])) >= 0) {
730			if (!strcmp(name[n], tmpl)
731			 || stat(name[n], &sb) != 0
732			 || (sb.st_mode & S_IFMT) != S_IFREG
733			 || (sb.st_mode & 077) != 0) {
734				result = 1;
735			}
736			close(fd);
737		}
738	}
739	if (result == 0
740	 && !strcmp(name[0], name[1]))
741		result = 1;
742	${cf_cv_main_return:-return}(result);
743}
744],[cf_cv_func_mkstemp=yes
745],[cf_cv_func_mkstemp=no
746],[cf_cv_func_mkstemp=maybe])
747])
748if test "x$cf_cv_func_mkstemp" = xmaybe ; then
749	AC_CHECK_FUNC(mkstemp)
750fi
751if test "x$cf_cv_func_mkstemp" = xyes || test "x$ac_cv_func_mkstemp" = xyes ; then
752	AC_DEFINE(HAVE_MKSTEMP,1,[Define to 1 if mkstemp() is available and working.])
753fi
754])dnl
755dnl ---------------------------------------------------------------------------
756dnl CF_MSG_LOG version: 5 updated: 2010/10/23 15:52:32
757dnl ----------
758dnl Write a debug message to config.log, along with the line number in the
759dnl configure script.
760AC_DEFUN([CF_MSG_LOG],[
761echo "${as_me:-configure}:__oline__: testing $* ..." 1>&AC_FD_CC
762])dnl
763dnl ---------------------------------------------------------------------------
764dnl CF_NO_LEAKS_OPTION version: 5 updated: 2012/10/02 20:55:03
765dnl ------------------
766dnl see CF_WITH_NO_LEAKS
767AC_DEFUN([CF_NO_LEAKS_OPTION],[
768AC_MSG_CHECKING(if you want to use $1 for testing)
769AC_ARG_WITH($1,
770	[$2],
771	[AC_DEFINE_UNQUOTED($3,1,"Define to 1 if you want to use $1 for testing.")ifelse([$4],,[
772	 $4
773])
774	: ${with_cflags:=-g}
775	: ${with_no_leaks:=yes}
776	 with_$1=yes],
777	[with_$1=])
778AC_MSG_RESULT(${with_$1:-no})
779
780case .$with_cflags in #(vi
781.*-g*)
782	case .$CFLAGS in #(vi
783	.*-g*) #(vi
784		;;
785	*)
786		CF_ADD_CFLAGS([-g])
787		;;
788	esac
789	;;
790esac
791])dnl
792dnl ---------------------------------------------------------------------------
793dnl CF_POSIX_C_SOURCE version: 8 updated: 2010/05/26 05:38:42
794dnl -----------------
795dnl Define _POSIX_C_SOURCE to the given level, and _POSIX_SOURCE if needed.
796dnl
797dnl	POSIX.1-1990				_POSIX_SOURCE
798dnl	POSIX.1-1990 and			_POSIX_SOURCE and
799dnl		POSIX.2-1992 C-Language			_POSIX_C_SOURCE=2
800dnl		Bindings Option
801dnl	POSIX.1b-1993				_POSIX_C_SOURCE=199309L
802dnl	POSIX.1c-1996				_POSIX_C_SOURCE=199506L
803dnl	X/Open 2000				_POSIX_C_SOURCE=200112L
804dnl
805dnl Parameters:
806dnl	$1 is the nominal value for _POSIX_C_SOURCE
807AC_DEFUN([CF_POSIX_C_SOURCE],
808[
809cf_POSIX_C_SOURCE=ifelse([$1],,199506L,[$1])
810
811cf_save_CFLAGS="$CFLAGS"
812cf_save_CPPFLAGS="$CPPFLAGS"
813
814CF_REMOVE_DEFINE(cf_trim_CFLAGS,$cf_save_CFLAGS,_POSIX_C_SOURCE)
815CF_REMOVE_DEFINE(cf_trim_CPPFLAGS,$cf_save_CPPFLAGS,_POSIX_C_SOURCE)
816
817AC_CACHE_CHECK(if we should define _POSIX_C_SOURCE,cf_cv_posix_c_source,[
818	CF_MSG_LOG(if the symbol is already defined go no further)
819	AC_TRY_COMPILE([#include <sys/types.h>],[
820#ifndef _POSIX_C_SOURCE
821make an error
822#endif],
823	[cf_cv_posix_c_source=no],
824	[cf_want_posix_source=no
825	 case .$cf_POSIX_C_SOURCE in #(vi
826	 .[[12]]??*) #(vi
827		cf_cv_posix_c_source="-D_POSIX_C_SOURCE=$cf_POSIX_C_SOURCE"
828		;;
829	 .2) #(vi
830		cf_cv_posix_c_source="-D_POSIX_C_SOURCE=$cf_POSIX_C_SOURCE"
831		cf_want_posix_source=yes
832		;;
833	 .*)
834		cf_want_posix_source=yes
835		;;
836	 esac
837	 if test "$cf_want_posix_source" = yes ; then
838		AC_TRY_COMPILE([#include <sys/types.h>],[
839#ifdef _POSIX_SOURCE
840make an error
841#endif],[],
842		cf_cv_posix_c_source="$cf_cv_posix_c_source -D_POSIX_SOURCE")
843	 fi
844	 CF_MSG_LOG(ifdef from value $cf_POSIX_C_SOURCE)
845	 CFLAGS="$cf_trim_CFLAGS"
846	 CPPFLAGS="$cf_trim_CPPFLAGS $cf_cv_posix_c_source"
847	 CF_MSG_LOG(if the second compile does not leave our definition intact error)
848	 AC_TRY_COMPILE([#include <sys/types.h>],[
849#ifndef _POSIX_C_SOURCE
850make an error
851#endif],,
852	 [cf_cv_posix_c_source=no])
853	 CFLAGS="$cf_save_CFLAGS"
854	 CPPFLAGS="$cf_save_CPPFLAGS"
855	])
856])
857
858if test "$cf_cv_posix_c_source" != no ; then
859	CFLAGS="$cf_trim_CFLAGS"
860	CPPFLAGS="$cf_trim_CPPFLAGS"
861	CF_ADD_CFLAGS($cf_cv_posix_c_source)
862fi
863
864])dnl
865dnl ---------------------------------------------------------------------------
866dnl CF_PROG_CC version: 3 updated: 2012/10/06 15:31:55
867dnl ----------
868dnl standard check for CC, plus followup sanity checks
869dnl $1 = optional parameter to pass to AC_PROG_CC to specify compiler name
870AC_DEFUN([CF_PROG_CC],[
871ifelse($1,,[AC_PROG_CC],[AC_PROG_CC($1)])
872CF_GCC_VERSION
873CF_ACVERSION_CHECK(2.52,
874	[AC_PROG_CC_STDC],
875	[CF_ANSI_CC_REQD])
876CF_CC_ENV_FLAGS 
877])dnl
878dnl ---------------------------------------------------------------------------
879dnl CF_PROG_LINT version: 2 updated: 2009/08/12 04:43:14
880dnl ------------
881AC_DEFUN([CF_PROG_LINT],
882[
883AC_CHECK_PROGS(LINT, tdlint lint alint splint lclint)
884AC_SUBST(LINT_OPTS)
885])dnl
886dnl ---------------------------------------------------------------------------
887dnl CF_REMOVE_DEFINE version: 3 updated: 2010/01/09 11:05:50
888dnl ----------------
889dnl Remove all -U and -D options that refer to the given symbol from a list
890dnl of C compiler options.  This works around the problem that not all
891dnl compilers process -U and -D options from left-to-right, so a -U option
892dnl cannot be used to cancel the effect of a preceding -D option.
893dnl
894dnl $1 = target (which could be the same as the source variable)
895dnl $2 = source (including '$')
896dnl $3 = symbol to remove
897define([CF_REMOVE_DEFINE],
898[
899$1=`echo "$2" | \
900	sed	-e 's/-[[UD]]'"$3"'\(=[[^ 	]]*\)\?[[ 	]]/ /g' \
901		-e 's/-[[UD]]'"$3"'\(=[[^ 	]]*\)\?[$]//g'`
902])dnl
903dnl ---------------------------------------------------------------------------
904dnl CF_TRY_XOPEN_SOURCE version: 1 updated: 2011/10/30 17:09:50
905dnl -------------------
906dnl If _XOPEN_SOURCE is not defined in the compile environment, check if we
907dnl can define it successfully.
908AC_DEFUN([CF_TRY_XOPEN_SOURCE],[
909AC_CACHE_CHECK(if we should define _XOPEN_SOURCE,cf_cv_xopen_source,[
910	AC_TRY_COMPILE([
911#include <stdlib.h>
912#include <string.h>
913#include <sys/types.h>
914],[
915#ifndef _XOPEN_SOURCE
916make an error
917#endif],
918	[cf_cv_xopen_source=no],
919	[cf_save="$CPPFLAGS"
920	 CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
921	 AC_TRY_COMPILE([
922#include <stdlib.h>
923#include <string.h>
924#include <sys/types.h>
925],[
926#ifdef _XOPEN_SOURCE
927make an error
928#endif],
929	[cf_cv_xopen_source=no],
930	[cf_cv_xopen_source=$cf_XOPEN_SOURCE])
931	CPPFLAGS="$cf_save"
932	])
933])
934
935if test "$cf_cv_xopen_source" != no ; then
936	CF_REMOVE_DEFINE(CFLAGS,$CFLAGS,_XOPEN_SOURCE)
937	CF_REMOVE_DEFINE(CPPFLAGS,$CPPFLAGS,_XOPEN_SOURCE)
938	cf_temp_xopen_source="-D_XOPEN_SOURCE=$cf_cv_xopen_source"
939	CF_ADD_CFLAGS($cf_temp_xopen_source)
940fi
941])
942dnl ---------------------------------------------------------------------------
943dnl CF_UPPER version: 5 updated: 2001/01/29 23:40:59
944dnl --------
945dnl Make an uppercase version of a variable
946dnl $1=uppercase($2)
947AC_DEFUN([CF_UPPER],
948[
949$1=`echo "$2" | sed y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%`
950])dnl
951dnl ---------------------------------------------------------------------------
952dnl CF_VERBOSE version: 3 updated: 2007/07/29 09:55:12
953dnl ----------
954dnl Use AC_VERBOSE w/o the warnings
955AC_DEFUN([CF_VERBOSE],
956[test -n "$verbose" && echo "	$1" 1>&AC_FD_MSG
957CF_MSG_LOG([$1])
958])dnl
959dnl ---------------------------------------------------------------------------
960dnl CF_WITH_DBMALLOC version: 7 updated: 2010/06/21 17:26:47
961dnl ----------------
962dnl Configure-option for dbmalloc.  The optional parameter is used to override
963dnl the updating of $LIBS, e.g., to avoid conflict with subsequent tests.
964AC_DEFUN([CF_WITH_DBMALLOC],[
965CF_NO_LEAKS_OPTION(dbmalloc,
966	[  --with-dbmalloc         test: use Conor Cahill's dbmalloc library],
967	[USE_DBMALLOC])
968
969if test "$with_dbmalloc" = yes ; then
970	AC_CHECK_HEADER(dbmalloc.h,
971		[AC_CHECK_LIB(dbmalloc,[debug_malloc]ifelse([$1],,[],[,$1]))])
972fi
973])dnl
974dnl ---------------------------------------------------------------------------
975dnl CF_WITH_DMALLOC version: 7 updated: 2010/06/21 17:26:47
976dnl ---------------
977dnl Configure-option for dmalloc.  The optional parameter is used to override
978dnl the updating of $LIBS, e.g., to avoid conflict with subsequent tests.
979AC_DEFUN([CF_WITH_DMALLOC],[
980CF_NO_LEAKS_OPTION(dmalloc,
981	[  --with-dmalloc          test: use Gray Watson's dmalloc library],
982	[USE_DMALLOC])
983
984if test "$with_dmalloc" = yes ; then
985	AC_CHECK_HEADER(dmalloc.h,
986		[AC_CHECK_LIB(dmalloc,[dmalloc_debug]ifelse([$1],,[],[,$1]))])
987fi
988])dnl
989dnl ---------------------------------------------------------------------------
990dnl CF_WITH_VALGRIND version: 1 updated: 2006/12/14 18:00:21
991dnl ----------------
992AC_DEFUN([CF_WITH_VALGRIND],[
993CF_NO_LEAKS_OPTION(valgrind,
994	[  --with-valgrind         test: use valgrind],
995	[USE_VALGRIND])
996])dnl
997dnl ---------------------------------------------------------------------------
998dnl CF_WITH_WARNINGS version: 5 updated: 2004/07/23 14:40:34
999dnl ----------------
1000dnl Combine the checks for gcc features into a configure-script option
1001dnl
1002dnl Parameters:
1003dnl	$1 - see CF_GCC_WARNINGS
1004AC_DEFUN([CF_WITH_WARNINGS],
1005[
1006if ( test "$GCC" = yes || test "$GXX" = yes )
1007then
1008AC_MSG_CHECKING(if you want to check for gcc warnings)
1009AC_ARG_WITH(warnings,
1010	[  --with-warnings         test: turn on gcc warnings],
1011	[cf_opt_with_warnings=$withval],
1012	[cf_opt_with_warnings=no])
1013AC_MSG_RESULT($cf_opt_with_warnings)
1014if test "$cf_opt_with_warnings" != no ; then
1015	CF_GCC_ATTRIBUTES
1016	CF_GCC_WARNINGS([$1])
1017fi
1018fi
1019])dnl
1020dnl ---------------------------------------------------------------------------
1021dnl CF_XOPEN_SOURCE version: 43 updated: 2013/02/10 10:41:05
1022dnl ---------------
1023dnl Try to get _XOPEN_SOURCE defined properly that we can use POSIX functions,
1024dnl or adapt to the vendor's definitions to get equivalent functionality,
1025dnl without losing the common non-POSIX features.
1026dnl
1027dnl Parameters:
1028dnl	$1 is the nominal value for _XOPEN_SOURCE
1029dnl	$2 is the nominal value for _POSIX_C_SOURCE
1030AC_DEFUN([CF_XOPEN_SOURCE],[
1031AC_REQUIRE([AC_CANONICAL_HOST])
1032
1033cf_XOPEN_SOURCE=ifelse([$1],,500,[$1])
1034cf_POSIX_C_SOURCE=ifelse([$2],,199506L,[$2])
1035cf_xopen_source=
1036
1037case $host_os in #(vi
1038aix[[4-7]]*) #(vi
1039	cf_xopen_source="-D_ALL_SOURCE"
1040	;;
1041cygwin) #(vi
1042	cf_XOPEN_SOURCE=600
1043	;;
1044darwin[[0-8]].*) #(vi
1045	cf_xopen_source="-D_APPLE_C_SOURCE"
1046	;;
1047darwin*) #(vi
1048	cf_xopen_source="-D_DARWIN_C_SOURCE"
1049	cf_XOPEN_SOURCE=
1050	;;
1051freebsd*|dragonfly*) #(vi
1052	# 5.x headers associate
1053	#	_XOPEN_SOURCE=600 with _POSIX_C_SOURCE=200112L
1054	#	_XOPEN_SOURCE=500 with _POSIX_C_SOURCE=199506L
1055	cf_POSIX_C_SOURCE=200112L
1056	cf_XOPEN_SOURCE=600
1057	cf_xopen_source="-D_BSD_TYPES -D__BSD_VISIBLE -D_POSIX_C_SOURCE=$cf_POSIX_C_SOURCE -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
1058	;;
1059hpux11*) #(vi
1060	cf_xopen_source="-D_HPUX_SOURCE -D_XOPEN_SOURCE=500"
1061	;;
1062hpux*) #(vi
1063	cf_xopen_source="-D_HPUX_SOURCE"
1064	;;
1065irix[[56]].*) #(vi
1066	cf_xopen_source="-D_SGI_SOURCE"
1067	cf_XOPEN_SOURCE=
1068	;;
1069linux*|gnu*|mint*|k*bsd*-gnu) #(vi
1070	CF_GNU_SOURCE
1071	;;
1072mirbsd*) #(vi
1073	# setting _XOPEN_SOURCE or _POSIX_SOURCE breaks <sys/select.h> and other headers which use u_int / u_short types
1074	cf_XOPEN_SOURCE=
1075	CF_POSIX_C_SOURCE($cf_POSIX_C_SOURCE)
1076	;;
1077netbsd*) #(vi
1078	cf_xopen_source="-D_NETBSD_SOURCE" # setting _XOPEN_SOURCE breaks IPv6 for lynx on NetBSD 1.6, breaks xterm, is not needed for ncursesw
1079	;;
1080openbsd[[4-9]]*) #(vi
1081	# setting _XOPEN_SOURCE lower than 500 breaks g++ compile with wchar.h, needed for ncursesw
1082	cf_xopen_source="-D_BSD_SOURCE"
1083	cf_XOPEN_SOURCE=600
1084	;;
1085openbsd*) #(vi
1086	# setting _XOPEN_SOURCE breaks xterm on OpenBSD 2.8, is not needed for ncursesw
1087	;;
1088osf[[45]]*) #(vi
1089	cf_xopen_source="-D_OSF_SOURCE"
1090	;;
1091nto-qnx*) #(vi
1092	cf_xopen_source="-D_QNX_SOURCE"
1093	;;
1094sco*) #(vi
1095	# setting _XOPEN_SOURCE breaks Lynx on SCO Unix / OpenServer
1096	;;
1097solaris2.*) #(vi
1098	cf_xopen_source="-D__EXTENSIONS__"
1099	;;
1100*)
1101	CF_TRY_XOPEN_SOURCE
1102	CF_POSIX_C_SOURCE($cf_POSIX_C_SOURCE)
1103	;;
1104esac
1105
1106if test -n "$cf_xopen_source" ; then
1107	CF_ADD_CFLAGS($cf_xopen_source)
1108fi
1109
1110dnl In anything but the default case, we may have system-specific setting
1111dnl which is still not guaranteed to provide all of the entrypoints that
1112dnl _XOPEN_SOURCE would yield.
1113if test -n "$cf_XOPEN_SOURCE" && test -z "$cf_cv_xopen_source" ; then
1114	AC_MSG_CHECKING(if _XOPEN_SOURCE really is set)
1115	AC_TRY_COMPILE([#include <stdlib.h>],[
1116#ifndef _XOPEN_SOURCE
1117make an error
1118#endif],
1119	[cf_XOPEN_SOURCE_set=yes],
1120	[cf_XOPEN_SOURCE_set=no])
1121	AC_MSG_RESULT($cf_XOPEN_SOURCE_set)
1122	if test $cf_XOPEN_SOURCE_set = yes
1123	then
1124		AC_TRY_COMPILE([#include <stdlib.h>],[
1125#if (_XOPEN_SOURCE - 0) < $cf_XOPEN_SOURCE
1126make an error
1127#endif],
1128		[cf_XOPEN_SOURCE_set_ok=yes],
1129		[cf_XOPEN_SOURCE_set_ok=no])
1130		if test $cf_XOPEN_SOURCE_set_ok = no
1131		then
1132			AC_MSG_WARN(_XOPEN_SOURCE is lower than requested)
1133		fi
1134	else
1135		CF_TRY_XOPEN_SOURCE
1136	fi
1137fi
1138])
1139