Re: libgcj/226: Fails to compile: "implicit declaration of function`int __builtin_expect(...)"

["Gregory R. Warnes" <warnes at biostat dot washington dot edu>]

The following reply was made to PR libgcj/226; it has been noted by GNATS.

From: "Gregory R. Warnes" <warnes@biostat.washington.edu>
To: Tom Tromey <tromey@cygnus.com>
Cc: java-gnats@sourceware.cygnus.com
Subject: Re: libgcj/226: Fails to compile: "implicit declaration of function
 `int __builtin_expect(...)"
Date: Thu, 18 May 2000 21:54:24 +0000 (GMT)

 Just to save time, the relevant portion of the libc configure script is
 
 ----begin quote----
 echo $ac_n "checking for __builtin_expect""... $ac_c" 1>&6
 echo "configure:2845: checking for __builtin_expect" >&5
 if eval "test \"`echo '$''{'libc_cv_gcc_builtin_expect'+set}'`\" =
 set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.c <<EOF
 #line 2850 "configure"
 int foo (int a)
 {
   a = __builtin_expect (a, 10);
   return a == 10 ? 0 : 1;
 }
 EOF
 if { ac_try='${CC-cc} $CFLAGS -nostdlib -nostartfiles
                             -o conftest conftest.c -lgcc >&5'; { (eval
 echo configure:2858: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
   libc_cv_gcc_builtin_expect=yes
 else
   libc_cv_gcc_builtin_expect=no
 fi
 rm -f conftest*
 fi
 
 echo "$ac_t""$libc_cv_gcc_builtin_expect" 1>&6
 if test "$libc_cv_gcc_builtin_expect" = yes; then
   cat >> confdefs.h <<\EOF
 #define HAVE_BUILTIN_EXPECT 1
 EOF
 
 fi
 ----end quote----
 
 
 On Thu, 18 May 2000, Tom Tromey wrote:
 
   TT>> >>>>> "Gregory" == Gregory R Warnes <warnes@biostat.washington.edu> writes:
   TT>> 
   TT>> Gregory> It would probably be a good idea to add an autoconf test for
   TT>> Gregory> __builtin_expect .
   TT>> 
   TT>> I agree, and that's what I'm planning to do.
   TT>> I might be able to get to it today.
   TT>> We'll see.  It depends on how my current project goes.
   TT>> 
   TT>> Tom
   TT>>