[Bug c++/37487] invalid return by value optimization

["khoaduynguyen at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #2 from khoaduynguyen at gmail dot com  2008-09-11 21:02 -------
-bash-3.1$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic
--host=x86_64-redhat-linux
Thread model: posix
gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)

[knguyen@rnd01 ~]$ g++ test2.cpp
[knguyen@rnd01 ~]$ ./a.out 
In main
Base(int), id=0, this=0x7ffff946c390
Base(const Base& k), id=1, this=0x7ffff946c2e0
Derived(const Base&), id=1, this=0x7ffff946c2e0
Test1 -- d.id=0


Base(int), id=2, this=0x7ffff946c3a0
Base(const Base& k), id=3, this=0x7ffff946c260
Derived(const Base&), id=3, this=0x7ffff946c260
Test2 -- d2.id=3


int Derived.test()
Base(int), id=4, this=0x7ffff946c1e0
Derived(), id=4, this0x7ffff946c1e0
Test3 -- d3.id=4


int Derived.test()
Base(int), id=5, this=0x7ffff946c380
Test4 -- b4.id=5, &b4=0x7ffff946c380


Base(), id=6, this=0x7ffff946c370
Base(), id=7, this=0x7ffff946c360
Base Operator=(const Base&), id=8, this=0x7ffff946c360
Base(const Base& k), id=9, this=0x7ffff946c160
Derived(const Base&), id=9, this=0x7ffff946c160
Test4 -- b4.id=9, &b4=0x7ffff946c160


-- 

khoaduynguyen at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|invalid return by value     |invalid return by value
                   |optimization                |optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37487