1dnl $Id: aclocal.m4,v 1.9 2013/06/02 21:31:27 tim Exp $
2dnl
3dnl OpenSSH-specific autoconf macros
4dnl
5
6dnl OSSH_CHECK_CFLAG_COMPILE(check_flag[, define_flag])
7dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
8dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
9dnl 'check_flag'.
10AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
11	AC_MSG_CHECKING([if $CC supports $1])
12	saved_CFLAGS="$CFLAGS"
13	CFLAGS="$CFLAGS $1"
14	_define_flag="$2"
15	test "x$_define_flag" = "x" && _define_flag="$1"
16	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int main(void) { return 0; }]])],
17		[
18if `grep -i "unrecognized option" conftest.err >/dev/null`
19then
20		AC_MSG_RESULT([no])
21		CFLAGS="$saved_CFLAGS"
22else
23		AC_MSG_RESULT([yes])
24		 CFLAGS="$saved_CFLAGS $_define_flag"
25fi],
26		[ AC_MSG_RESULT([no])
27		  CFLAGS="$saved_CFLAGS" ]
28	)
29}])
30
31
32dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol)
33dnl Does AC_EGREP_HEADER on 'header' for the string 'field'
34dnl If found, set 'symbol' to be defined. Cache the result.
35dnl TODO: This is not foolproof, better to compile and read from there
36AC_DEFUN(OSSH_CHECK_HEADER_FOR_FIELD, [
37# look for field '$1' in header '$2'
38	dnl This strips characters illegal to m4 from the header filename
39	ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'`
40	dnl
41	ossh_varname="ossh_cv_$ossh_safe""_has_"$1
42	AC_MSG_CHECKING(for $1 field in $2)
43	AC_CACHE_VAL($ossh_varname, [
44		AC_EGREP_HEADER($1, $2, [ dnl
45			eval "$ossh_varname=yes" dnl
46		], [ dnl
47			eval "$ossh_varname=no" dnl
48		]) dnl
49	])
50	ossh_result=`eval 'echo $'"$ossh_varname"`
51	if test -n "`echo $ossh_varname`"; then
52		AC_MSG_RESULT($ossh_result)
53		if test "x$ossh_result" = "xyes"; then
54			AC_DEFINE($3, 1, [Define if you have $1 in $2])
55		fi
56	else
57		AC_MSG_RESULT(no)
58	fi
59])
60
61dnl Check for socklen_t: historically on BSD it is an int, and in
62dnl POSIX 1g it is a type of its own, but some platforms use different
63dnl types for the argument to getsockopt, getpeername, etc.  So we
64dnl have to test to find something that will work.
65AC_DEFUN([TYPE_SOCKLEN_T],
66[
67   AC_CHECK_TYPE([socklen_t], ,[
68      AC_MSG_CHECKING([for socklen_t equivalent])
69      AC_CACHE_VAL([curl_cv_socklen_t_equiv],
70      [
71	 # Systems have either "struct sockaddr *" or
72	 # "void *" as the second argument to getpeername
73	 curl_cv_socklen_t_equiv=
74	 for arg2 in "struct sockaddr" void; do
75	    for t in int size_t unsigned long "unsigned long"; do
76	       AC_TRY_COMPILE([
77		  #include <sys/types.h>
78		  #include <sys/socket.h>
79
80		  int getpeername (int, $arg2 *, $t *);
81	       ],[
82		  $t len;
83		  getpeername(0,0,&len);
84	       ],[
85		  curl_cv_socklen_t_equiv="$t"
86		  break
87	       ])
88	    done
89	 done
90
91	 if test "x$curl_cv_socklen_t_equiv" = x; then
92	    AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
93	 fi
94      ])
95      AC_MSG_RESULT($curl_cv_socklen_t_equiv)
96      AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
97			[type to use in place of socklen_t if not defined])],
98      [#include <sys/types.h>
99#include <sys/socket.h>])
100])
101
102