get_libc

# Looking in libc for some functions.
exe=$osname-$arch-tmp$$$exe_suff
_has_list=
echo Looking in C lib for some symbols...
extra_flags=-lm

if test "$arch" = "x86_64" && test "$sizeof_long" = "8"; then
  list=sse2; . ./look
fi
list=exp2; . ./look
list=log2; . ./look
extra_flags=
list=strftime; . ./look
if test "$timing_fun" = "clock_gettime"; then
  list=clock_gettime; . ./look
  if test "$has_clock_gettime" = no; then
    echo "Try again, with -lrt this time..."
    extra_flags=-lrt
    list=clock_gettime; . ./look
    extra_flags=
    if test "$has_clock_gettime" = yes; then
      RT_LIBS=-lrt
    fi
  fi
else
  if test -n "$timing_fun"; then
    list=$timing_fun
  else
    case "$osname" in
      *cygwin*) list='times';; # getrusage based timer always returns 0
      *) list='getrusage times';;
    esac;
  fi; . ./look
fi
if test "$has_clock_gettime" = yes -o "$has_ftime" = yes; then
  :
else
  list='gettimeofday ftime'; . ./look
  if test "$has_ftime" = yes; then
    has_ftimeforwalltime=yes
    unset has_ftime
  fi
fi
list=sigaction; . ./look
list=TIOCGWINSZ; . ./look
list=getrlimit; . ./look
list='stat opendir'; . ./look
list=vsnprintf; . ./look
if test "$enable_mmap" = "no"; then
  has_mmap=no
else
  list=mmap; . ./look
fi
list=waitpid; . ./look
list=setsid; . ./look
list=getenv; . ./look
list=isatty; . ./look
list=alarm; . ./look
list=system; . ./look

# For install(). Do we need libdl.so?
# on irix and osf1 -ldl not needed
extra_flags=
DL_LIBS=
list=dlopen; . ./look
if test "$has_dlopen" = no; then
  echo "Try again, with -ldl this time..."
  extra_flags=-ldl; . ./look
  if test "$has_dlopen" = yes; then
    DL_LIBS=-ldl
  fi
fi
if test "$has_dlopen" = no; then
  case "$osname" in
    os2|darwin)
      echo "Will use builtin dlopen() support for $osname..."
      has_dlopen=builtin
  esac
fi