+
+ dnl *********************************
+ dnl *** Checks for math functions ***
+ dnl *********************************
+ LIBS="$LIBS -lm";
+ AC_CHECK_FUNCS(finite, , AC_MSG_CHECKING(for finite in math.h)
+ AC_TRY_LINK([#include <math.h>],
+ [ finite(0.0); ],
+ AC_DEFINE(HAVE_FINITE) AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no)))
+ AC_CHECK_FUNCS(isfinite, , AC_MSG_CHECKING(for isfinite in math.h)
+ AC_TRY_LINK([#include <math.h>],
+ [ isfinite(0.0); ],
+ AC_DEFINE(HAVE_ISFINITE) AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no)))
+
+ dnl ****************************************************************
+ dnl *** Checks for working poll() (macosx defines it but doesn't ***
+ dnl *** have it in the library (duh)) ***
+ dnl ****************************************************************
+ AC_CHECK_FUNCS(poll)
+
+ dnl *************************
+ dnl *** Check for signbit ***
+ dnl *************************
+ AC_MSG_CHECKING(for signbit)
+ AC_TRY_LINK([#include <math.h>], [
+ int s = signbit(1.0);
+ ], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_SIGNBIT)
+ ], [
+ AC_MSG_RESULT(no)
+ ])
+
+ dnl *********************
+ dnl *** Check for AIO ***
+ dnl *********************
+ AC_MSG_CHECKING([for SIGEV_THREAD definition])
+ dnl Some systems (FreeBSD at least) may have aio_read
+ dnl but don't support/define SIGEV_THREAD.
+ AC_TRY_COMPILE([
+ #include <sys/signal.h>
+ ],[
+ int x = SIGEV_THREAD;
+ ],[
+ ac_cv_c_sigev_thread=yes
+ AC_MSG_RESULT(yes)
+ ],[
+ AC_MSG_RESULT(no)
+ ])
+
+ if test "$ac_cv_c_sigev_thread" = "yes" ; then
+ AC_CHECK_HEADERS(aio.h sys/aio.h)
+ AC_CHECK_LIB(rt, aio_read, [ LIBS="$LIBS -lrt" ],)
+ SIGVAL_PTR="undefined"
+ if test "$ac_cv_header_aio_h" = "yes" -o "$ac_cv_header_sys_aio_h" = "yes" ; then
+ AC_CHECK_MEMBER(union sigval.sigval_ptr,SIGVAL_PTR="sigval_ptr",, [
+ #include <sys/signal.h>
+ ])
+ AC_CHECK_MEMBER(union sigval.sival_ptr,SIGVAL_PTR="sival_ptr",, [
+ #include <sys/signal.h>
+ ])
+ if test "$SIGVAL_PTR" = "undefined" ; then
+ AC_MSG_ERROR([Unable to detect field name in 'union sigval'])
+ fi
+ fi
+ AC_DEFINE_UNQUOTED(SIGVAL_PTR,$SIGVAL_PTR,[Pointer field name in 'union sigval'])
+ fi