Optimisation wrongly removes global objet construction/destruction

[Gabriel Dos_Reis]

current CVS EGCS/g++ appears to wrongly remove text definition for
contruction/destruction of global objects. The problem shows up when
compilinig with -Ox, whith x > 2, on a solaris-2.[56]. Below is a
testcase:

poivre% cat a.C  
void f() {}

struct X {
    ~X() { f (); }
};

X x;

poivre% g++ -v; g++ -O3 -c a.C; nm a.o 
Reading specs from
/BASE/dosreis/EGCS/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/specs
gcc version egcs-2.93.21 19990504 (gcc2 ss-980929 experimental)
                 U _GLOBAL_.D.x
                 U _GLOBAL_.I.x
0000000000000000 ? __FRAME_BEGIN__
0000000000000000 t __static_initialization_and_destruction_0
0000000000000018 t __static_initialization_and_destruction_1
0000000000000010 T f__Fv
0000000000000000 t gcc2_compiled.
0000000000000000 B x


Whereas
poivre% g++ -v; g++ -O2 -c a.C; nm a.o 
Reading specs from
/BASE/dosreis/EGCS/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/specs
gcc version egcs-2.93.21 19990504 (gcc2 ss-980929 experimental)
0000000000000068 t _GLOBAL_.D.f__Fv
0000000000000040 t _GLOBAL_.I.f__Fv
0000000000000000 ? __FRAME_BEGIN__
0000000000000008 t __static_initialization_and_destruction_0
0000000000000038 t __static_initialization_and_destruction_1
0000000000000000 T f__Fv
0000000000000000 t gcc2_compiled.
0000000000000000 B x


As a side effect building libstdc++ with -O3 gives an unusable library
since construction/destruction of io_defs__ (from libio/streambuf.cc)
are undefined although referenced.

-- Gaby