Consider the following example:
#include <cmath>
// Okay if we do this:
//using std::floor;
double f(double d)
{
// If we do this, however, GCC says: "shadow.C:7: warning:
// shadowing built-in function `double std::floor(double)'"
using std::floor;
return floor(d);
}
As indicated in the comments, the example compiles without warnings when using
-Wshadow IFF 'using std::floor' is at file scope. However, if the using
declaration is moved inside of a function, GCC complains about shadowing a
built-in.
-------
[EMAIL PROTECTED]:~/playpen$ g++-3.4 -v
Reading specs from /usr/lib/gcc/i486-linux/3.4.4/specs
Configured with: ../src/configure -v
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr
--libexecdir=/usr/lib --with-gxx-include-dir=/usr/include/c++/3.4
--enable-shared --with-system-zlib --enable-nls --without-included-gettext
--program-suffix=-3.4 --enable-__cxa_atexit --enable-libstdcxx-allocator=mt
--enable-clocale=gnu --enable-libstdcxx-debug --enable-java-gc=boehm
--enable-java-awt=gtk --disable-werror i486-linux
Thread model: posix
gcc version 3.4.4 20050314 (prerelease) (Debian 3.4.3-13)
--
Summary: -Wshadow gets confused by built-ins
Product: gcc
Version: 3.4.4
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: cnewbold at mathworks dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24368
