🚀 go-pugleaf

   Date:     Sun, 17 Dec 89 11:36:06 PST
   From: rfg@ics.uci.edu


   // bug 12178901 - linkage of global const objects

   // What is the `linkage' of const objects in C++?

   // GCC generates code for the following such that `ci' has
   // extern linkage, and such that its initial value is 99.

   // G++ 1.36.1 however optimizes this declaration into nothing.
   // Thus, if some other file contained `extern const int ci;'
   // that other file would fail to link.

   const int ci = 99;

If you want GNU C++ to export these declarations, it is sufficient
only to declare `extern const int ci;' prior to declaring its initial
value.  This gives expected behavior in expected case, namely that the
file which provides the definition of ci will also include a files
which contains its extern declaration.

Unless you have been asleep for the past year, you know that declaring
things extern in C files (rather than in .h files) is more and more
becomming a no-no.

Michael