Package: g++-4.3 Version: 4.3.2-1.1 Severity: normal
As documented here: http://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas g++ supports using the #pragma pack syntax to forcibly pack a structure which must be the minimum size. The alternative mechanism to specify this is to add `__attribute__((packed))' before the final terminating semicolon of the struct definition. Unfortunately it seems the path for checking errors is not uniform between the two mechanisms. The compiler complains about the definition of struct Y (returning a reference to a field in a packed struct is invalid) in the following program, but not the definition of struct X. #include <cstdlib> #pragma pack(push, 1) struct X { int x; int& operator[](size_t) { return this->x; } }; #pragma pack(pop) struct Y { int x; int& operator[](size_t) { return this->x; } } __attribute__((packed)); If these paths are truly doing the same thing, the error message should also apply to the first struct's definition. The exact error text is: pack.cxx: In member function ‘int& Y::operator[](size_t)’: pack.cxx:11: error: cannot bind packed field ‘((Y*)this)->Y::x’ to ‘int&’ -- System Information: Debian Release: 5.0.6 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.26-2-amd64 (SMP w/8 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages g++-4.3 depends on: ii gcc-4.3 4.3.2-1.1 The GNU C compiler ii gcc-4.3-base 4.3.2-1.1 The GNU Compiler Collection (base ii libc6 2.7-18lenny4 GNU C Library: Shared libraries ii libgmp3c2 2:4.2.2+dfsg-3 Multiprecision arithmetic library ii libmpfr1ldbl 2.3.1.dfsg.1-2 multiple precision floating-point ii libstdc++6-4.3-dev 4.3.2-1.1 The GNU Standard C++ Library v3 (d g++-4.3 recommends no packages. Versions of packages g++-4.3 suggests: pn g++-4.3-multilib <none> (no description available) ii gcc-4.3-doc 4.3.2.nf1-1 documentation for the GNU compiler pn libstdc++6-4.3-dbg <none> (no description available) -- no debconf information -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
