John Polstra d5489b0d8f Check the count in the first word of __CTOR_LIST__ before executing ... the loop that invokes the static constructors. That makes it safe to link c++rt0.o into any shared library, even one that does not have any static constructors. Formerly, doing that would cause a bus error. If the library has no static constructors, __CTOR_LIST__ comes out as a simple 4-byte COMMON region, and it does not have the usual NULL word that terminates the list of constructors. This caused the old code to "call" a garbage address via the non-existent entry __CTOR_LIST__[1]. The analogous code that invokes the static destructors was already safe. This change is fully backward-compatible. Reviewed by: dfr@render.com (Doug Rabson)		1996-01-15 17:53:25 +00:00
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i386	Check the count in the first word of __CTOR_LIST__ before executing	1996-01-15 17:53:25 +00:00