[C/C++] Fail to build Android with g++/gcc-4.6 (Ubuntu-11.10)

Language/C&C++ 2011.10.17 15:12

[ g++ issue ]

g++-4.4 / g++-4.5 doesn't detect following case, but, g++-4.6 does.

< a.cpp >

class P {
    void a();

class A : public P {
    void p();

P::a() {
    // 'const' quailifier' is discard here!
    static_cast<const A*>(this)->p();

A::p() {

main() {
    return 0;

=================== Test ======================
$ g++-4.5 a.cpp   <= OK.
$ g++-4.6 a.cpp
a.cpp: In member function ‘void P::a()’:
a.cpp:13:33: error: passing ‘const A’ as ‘this’ argument of ‘void A::p()’ discards qualifiers [-fpermissive]

The problem is some of Android codes still have above bugs in its code - ex. frameworks/base/libs/utils/RefBase.cpp.
So, even if Android source code was successfully compiled at g++-4.4 or g++4.5, it may be failed at g++-4.6 (for example, upgrading host OS)

[ cc/gcc issue ]

Compiling with gcc-4.6 raises following warings.

<command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by default]

In some component which uses '-Werror' option, this warning stops compilation.

[ Conclusion ]

So, you would better to use gcc/g++-4.4 instead of 4.6 when building Android, until above issues are resolved on Android baseline.
(ex. Ubuntu 11.10 as an Android host OS.)

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