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From: "kevin.waugh at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/46073] New: __builtin_choose_expr outputs warnings for unused expression
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D46073

           Summary: __builtin_choose_expr outputs warnings for unused
                    expression
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: kevin.waugh@gmail.com


$ gcc -std=3Dc99 -Wall -x c - << EOF
void A(int * p) {}
void B(double * p) {}
int main() {
  int * p =3D 0;
  __builtin_choose_expr(__builtin_types_compatible_p(__typeof__(p), int *),
A(p), B(p));
  return 0;
}
EOF
<stdin>: In function =E2=80=98main=E2=80=99:
<stdin>:5: warning: passing argument 1 of =E2=80=98B=E2=80=99 from incompat=
ible pointer type

$ gcc -v
Using built-in specs.
Target: i686-apple-darwin9
Configured with: /var/tmp/gcc/gcc-5493~1/src/configure --disable-checking
-enable-werror --prefix=3D/usr --mandir=3D/share/man
--enable-languages=3Dc,objc,c++,obj-c++
--program-transform-name=3D/^[cg][^.-]*$/s/$/-4.0/
--with-gxx-include-dir=3D/include/c++/4.0.0 --with-slibdir=3D/usr/lib
--build=3Di686-apple-darwin9 --with-arch=3Dapple --with-tune=3Dgeneric
--host=3Di686-apple-darwin9 --target=3Di686-apple-darwin9
Thread model: posix
gcc version 4.0.1 (Apple Inc. build 5493)