When a namespace declares a function, and then "uses" another function with the
same name from a different namespace, the using declaration seems to hide the
function declaration. At least, when I define the function body later, the
comiler complains that the function wasn't declared in the namespace. However,
if I "use" the function first, and THEN declare it in the namespace, the
definition of the function is accepted. (It's easer to show code than explain.
See below.)
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.2-1ubuntu11'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3
--program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu11)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic'
/usr/lib/gcc/i486-linux-gnu/4.3.2/cc1plus -E -quiet -v -D_GNU_SOURCE asdf.cpp
-D_FORTIFY_SOURCE=2 -mtune=generic -fpch-preprocess -o asdf.ii
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i486-linux-gnu/4.3.2/../../../../i486-linux-gnu/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.3
/usr/include/c++/4.3/i486-linux-gnu
/usr/include/c++/4.3/backward
/usr/local/include
/usr/lib/gcc/i486-linux-gnu/4.3.2/include
/usr/lib/gcc/i486-linux-gnu/4.3.2/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic'
/usr/lib/gcc/i486-linux-gnu/4.3.2/cc1plus -fpreprocessed asdf.ii -quiet
-dumpbase asdf.cpp -mtune=generic -auxbase asdf -version -fstack-protector -o
asdf.s
GNU C++ (Ubuntu 4.3.2-1ubuntu11) version 4.3.2 (i486-linux-gnu)
compiled by GNU C version 4.3.2, GMP version 4.2.2, MPFR version 2.3.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: dc8f858cacda993dd8f70837f0d9565d
asdf.cpp:15: error: void A::f(int) should have been declared inside A
Source Code:
void f() {}
namespace A {
void f(int);
using ::f;
}
//
// With the function declaration in namespace A appearing first, the
// implementation below fails to compile. Switch the order (such that the
// "using" appears first) and then it compiles.
//
// g++ /tmp/asdf.cpp
// /tmp/asdf.cpp:15: error: void A::f(int) should have been declared inside
A
void A::f(int a) {}
int main() {
A::f(1);
}
--
Summary: using declaration appears to hide local declaration
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: cuzdav at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38799
