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1dnl @synopsis GP_CHECK_POPT(FLAG)
2dnl
3dnl Check whether libpopt is available.
4dnl FLAG must be one of
5dnl    "mandatory"
6dnl    "default-enabled"
7dnl    "default-disabled"
8dnl
9AC_DEFUN([GP_CHECK_POPT],[
10#
11# [GP_CHECK_POPT]
12#
13AC_REQUIRE([GP_CONFIG_MSG])dnl
14m4_if([$1],[mandatory],        [_GP_CHECK_POPT([mandatory])],
15      [$1],[default-enabled],  [_GP_CHECK_POPT([disable])],
16      [$1],[default-disabled], [_GP_CHECK_POPT([enable])],
17      [m4_errprint(__file__:__line__:[ Error:
18Illegal argument to $0: `$1'
19Valid values are: mandatory, default-enabled, default-disabled
20])m4_exit(1)])dnl
21])dnl
22dnl
23AC_DEFUN([_GP_CHECK_POPT],[
24m4_if([$1],[mandatory],[
25try_popt=yes
26require_popt=yes
27],[
28try_popt=auto
29require_popt=no
30AC_ARG_ENABLE([popt],
31[AS_HELP_STRING([--$1-popt],[Do not use popt])],
32[ if   test "x$withval" = no \
33    || test "x$withval" = off \
34    || test "x$withval" = false;
35  then
36    try_popt=no
37    require_popt=no
38  elif test "x$withval" = yes \
39    || test "x$withval" = on \
40    || test "x$withval" = true
41  then
42    try_popt=yes
43    require_popt=yes
44  fi
45])dnl
46])dnl
47
48AC_MSG_CHECKING([whether popt is required])
49AC_MSG_RESULT([${require_popt}])
50
51if test "$require_popt" != yes; then
52	AC_MSG_CHECKING([whether popt is requested])
53	AC_MSG_RESULT([${try_popt}])
54fi
55
56dnl Implicit AC_SUBST
57AC_ARG_VAR([POPT_CFLAGS],[CPPFLAGS to compile with libpopt])dnl
58AC_ARG_VAR([POPT_LIBS],[LDFLAGS to link with libpopt])dnl
59
60have_popt=no
61
62if test "x$POPT_CFLAGS" = "x" && test "x$POPT_LIBS" = "x"; then
63
64	# try to find options to compile popt.h
65	CPPFLAGS_save="$CPPFLAGS"
66	popth_found=no
67	for popt_prefix in "" /usr /usr/local
68	do
69		if test -n "${popt_prefix}"; then
70			:
71		elif test -d "${popt_prefix}/include"; then
72			CPPFLAGS="-I${popt_prefix}/include ${CPPFLAGS}"
73		else
74			continue
75		fi
76		ac_cv_header_popt_h=""
77		unset ac_cv_header_popt_h
78		AC_CHECK_HEADER([popt.h], [popth_found=yes])
79		if test "$popth_found" = yes; then break; fi
80	done
81	CPPFLAGS="$CPPFLAGS_save"
82	if test "$popth_found" = "yes"; then
83		if test "$popt_prefix" = ""; then
84			POPT_CFLAGS=""
85		else
86			POPT_CFLAGS="-I${popt_prefix}/include"
87		fi
88	else
89		AC_MSG_ERROR([
90* Cannot autodetect popt.h
91*
92* Set POPT_CFLAGS and POPT_LIBS correctly.
93])
94	fi
95
96	# try to find options to link against popt
97	LDFLAGS_save="$LDFLAGS"
98	popt_links=no
99	for popt_prefix in /usr "" /usr/local; do
100		# We could have "/usr" and "lib64" at the beginning of the
101		# lists. Then the first tested location would
102		# incidentally be the right one on 64bit systems, and
103		# thus work around a bug in libtool on 32bit systems:
104		#
105		# 32bit libtool doesn't know about 64bit systems, and so the
106		# compilation will fail when linking a 32bit library from
107		# /usr/lib to a 64bit binary.
108		#
109		# This hack has been confirmed to workwith a
110		# 32bit Debian Sarge and 64bit Fedora Core 3 system.
111		for ldir in lib64 "" lib; do
112			popt_libdir="${popt_prefix}/${ldir}"
113			if test "${popt_libdir}" = "/"; then
114				popt_libdir=""
115			elif test -d "${popt_libdir}"; then
116				LDFLAGS="-L${popt_libdir} ${LDFLAGS}"
117			else
118				continue
119			fi
120			# Avoid caching of results
121			ac_cv_lib_popt_poptStuffArgs=""
122			unset ac_cv_lib_popt_poptStuffArgs
123			AC_CHECK_LIB([popt], [poptStuffArgs], [popt_links=yes])
124			if test "$popt_links" = yes; then break; fi
125		done
126		if test "$popt_links" = yes; then break; fi
127	done
128	LDFLAGS="$LDFLAGS_save"
129	if test "$popt_links" = "yes"; then
130		if test "$popt_libdir" = ""; then
131			POPT_LIBS="-lpopt"
132		else
133			POPT_LIBS="-L${popt_libdir} -lpopt"
134		fi
135	else
136		AC_MSG_ERROR([
137* Cannot autodetect library directory containing popt
138*
139* Set POPT_CFLAGS and POPT_LIBS correctly.
140])
141	fi
142	have_popt=yes
143elif test "x$POPT_CFLAGS" != "x" && test "x$POPT_LIBS" != "x"; then
144    # just use the user specivied option
145    popt_msg="yes (user specified)"
146    have_popt=yes
147else
148	AC_MSG_ERROR([
149* Fatal: Either set both POPT_CFLAGS and POPT_LIBS or neither.
150])
151fi
152
153AC_MSG_CHECKING([if popt is functional])
154if test "$require_popt$have_popt" = "yesno"; then
155	AC_MSG_RESULT([no, but required])
156	AC_MSG_ERROR([
157* popt library not found
158* Fatal: ${PACKAGE_NAME} (${PACKAGE_TARNAME}) requires popt
159* Please install it and/or set POPT_CFLAGS and POPT_LIBS.
160])
161fi
162AC_MSG_RESULT([${have_popt}])
163
164GP_CONFIG_MSG([use popt library], [${have_popt}])
165if test "$have_popt" = "yes"; then
166	AC_DEFINE([HAVE_POPT],[1],[whether the popt library is available])
167	GP_CONFIG_MSG([popt libs],[${POPT_LIBS}])
168	GP_CONFIG_MSG([popt cppflags],[${POPT_CFLAGS}])
169fi
170AM_CONDITIONAL([HAVE_POPT],[test "$have_popt" = "yes"])
171])dnl
172dnl
173dnl Please do not remove this:
174dnl filetype: 7595380e-eff3-49e5-90ab-e40f1d544639
175dnl I use this to find all the different instances of this file which
176dnl are supposed to be synchronized.
177dnl
178dnl Local Variables:
179dnl mode: autoconf
180dnl End:
181