Re: What is the warning about builtin-function on gcc-4.6.0 ?

[ytomino <aghia05@gmail.com>]

On Mar 27, 9:00 pm, a...@att.net wrote:
> Using C you may need to also change the first underscore or remove both
> such as
>
>   pragma Import (C, isfinite, "_builtin_isfinite");

$ /usr/local/bin/gcc-4.6.0/gnatmake test1
gcc -c test1.adb
gnatbind -x test1.ali
gnatlink test1.ali
Undefined symbols:
  "__builtin_isfinite", referenced from:
      __ada_test1 in test1.o
      __ada_test1 in test1.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
gnatlink: error when calling /usr/local/bin/gcc-4.6.0/gcc
gnatmake: *** link failed.

> or
>   pragma Import (C, isfinite, "builtin_isfinite");

$ /usr/local/bin/gcc-4.6.0/gnatmake test1
gcc -c test1.adb
gnatbind -x test1.ali
gnatlink test1.ali
Undefined symbols:
  "_builtin_isfinite", referenced from:
      __ada_test1 in test1.o
      __ada_test1 in test1.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
gnatlink: error when calling /usr/local/bin/gcc-4.6.0/gcc
gnatmake: *** link failed.

In the first, libc.a (or libm.a) does not have the body of "isfinite"
function.
gcc expands builtin-functions to inline-assembly code.
To tell the truth, libm.a has "_isfinite", but that is unused to call
"__builtin_isfinite".
Please make sure with nm.