C++ constructors

Jonathan Larmour jlarmour@redhat.com
Wed Jun 6 10:36:00 GMT 2001

João Cadamuro Junior wrote:
> Hello,
> I have worked with GCC and G++ for "powerpc-eabi" embedded targets. In
> the last two versions of GCC (2.95.2 and 2.95.3) I have learned some
> hard things about C++ constructor and GCC.
> Under gcc-2.95.2 the execution order of constructors is the linkage
> order. The first file linked will construct their objects first.
> Under gcc-2.95.3, the behavior is the opposite. The last linked archive
> will construct their objects first.
> Since I want to have a c++ code to be compiled correctly independent of
> the compiler version, someone knows what can I do to force some order to
> constructors under G++?

Strictly according to the C++ standard, the execution order of constructors
is undefined.

You can control it in G++ though, by compiling with -finit-priority. Then
you can give your static objects (with constructors) a priority e.g.

static dummy_init_class dummy_init_obj

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