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# Check for support for nanosleep. It's defined in <time.h>, but on
# some systems, such as solaris, you need to link in a library to use it.
# We set acx_nanosleep_ok if nanosleep is supported; in that case,
# NANOSLEEP_LIBS is set to whatever libraries are needed to support
# nanosleep.
AC_DEFUN([ACX_NANOSLEEP],
[AC_MSG_CHECKING(if nanosleep requires any libraries)
AC_LANG_SAVE
AC_LANG_C
acx_nanosleep_ok="no"
NANOSLEEP_LIBS=
# For most folks, this should just work
AC_TRY_LINK([#include <time.h>],
[static struct timespec ts; nanosleep(&ts, NULL);],
[acx_nanosleep_ok=yes])
# For solaris, we may need -lrt
if test "x$acx_nanosleep_ok" != "xyes"; then
OLD_LIBS="$LIBS"
LIBS="-lrt $LIBS"
AC_TRY_LINK([#include <time.h>],
[static struct timespec ts; nanosleep(&ts, NULL);],
[acx_nanosleep_ok=yes])
if test "x$acx_nanosleep_ok" = "xyes"; then
NANOSLEEP_LIBS="-lrt"
fi
LIBS="$OLD_LIBS"
fi
if test "x$acx_nanosleep_ok" != "xyes"; then
AC_MSG_ERROR([cannot find the nanosleep function])
else
AC_MSG_RESULT(${NANOSLEEP_LIBS:-no})
fi
AC_LANG_RESTORE
])
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