1dnl $Id: aclocal.m4,v 1.8 2011/05/20 01:45:25 djm 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="$1" 16 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int main(void) { return 0; }]])], 17 [ AC_MSG_RESULT([yes]) 18 CFLAGS="$saved_CFLAGS $_define_flag"], 19 [ AC_MSG_RESULT([no]) 20 CFLAGS="$saved_CFLAGS" ] 21 ) 22}]) 23 24 25dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol) 26dnl Does AC_EGREP_HEADER on 'header' for the string 'field' 27dnl If found, set 'symbol' to be defined. Cache the result. 28dnl TODO: This is not foolproof, better to compile and read from there 29AC_DEFUN(OSSH_CHECK_HEADER_FOR_FIELD, [ 30# look for field '$1' in header '$2' 31 dnl This strips characters illegal to m4 from the header filename 32 ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'` 33 dnl 34 ossh_varname="ossh_cv_$ossh_safe""_has_"$1 35 AC_MSG_CHECKING(for $1 field in $2) 36 AC_CACHE_VAL($ossh_varname, [ 37 AC_EGREP_HEADER($1, $2, [ dnl 38 eval "$ossh_varname=yes" dnl 39 ], [ dnl 40 eval "$ossh_varname=no" dnl 41 ]) dnl 42 ]) 43 ossh_result=`eval 'echo $'"$ossh_varname"` 44 if test -n "`echo $ossh_varname`"; then 45 AC_MSG_RESULT($ossh_result) 46 if test "x$ossh_result" = "xyes"; then 47 AC_DEFINE($3, 1, [Define if you have $1 in $2]) 48 fi 49 else 50 AC_MSG_RESULT(no) 51 fi 52]) 53 54dnl Check for socklen_t: historically on BSD it is an int, and in 55dnl POSIX 1g it is a type of its own, but some platforms use different 56dnl types for the argument to getsockopt, getpeername, etc. So we 57dnl have to test to find something that will work. 58AC_DEFUN([TYPE_SOCKLEN_T], 59[ 60 AC_CHECK_TYPE([socklen_t], ,[ 61 AC_MSG_CHECKING([for socklen_t equivalent]) 62 AC_CACHE_VAL([curl_cv_socklen_t_equiv], 63 [ 64 # Systems have either "struct sockaddr *" or 65 # "void *" as the second argument to getpeername 66 curl_cv_socklen_t_equiv= 67 for arg2 in "struct sockaddr" void; do 68 for t in int size_t unsigned long "unsigned long"; do 69 AC_TRY_COMPILE([ 70 #include <sys/types.h> 71 #include <sys/socket.h> 72 73 int getpeername (int, $arg2 *, $t *); 74 ],[ 75 $t len; 76 getpeername(0,0,&len); 77 ],[ 78 curl_cv_socklen_t_equiv="$t" 79 break 80 ]) 81 done 82 done 83 84 if test "x$curl_cv_socklen_t_equiv" = x; then 85 AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) 86 fi 87 ]) 88 AC_MSG_RESULT($curl_cv_socklen_t_equiv) 89 AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv, 90 [type to use in place of socklen_t if not defined])], 91 [#include <sys/types.h> 92#include <sys/socket.h>]) 93]) 94 95