Re: -Wl,--as-needed considered possibly harmful

[Robert Collins <robertc@robertcollins.net>]

On Wed, 2007-12-26 at 13:11 +0000, Neil Williams wrote:
> 
> So could I ask, from an upstream perspective, what kind of changes in
> the underlying lib might *not* cause such a port and therefore end up
> with libfoo1 still being buildable against libbar3 yet *still* require
> a
> SONAME bump to accommodate the transition?

bar.h:
typedef unsigned int bar;

foo.h:
typedef struct {
  bar a_bar;
} exported_foo_type;

Then this patch to bar.h:
@@ -0,1 +0,1 @@
-typedef unsigned int bar;
+typedef size_t bar;

is enough to cause an ABI break in libfoo, without needing 'porting'
work (though it may well cause print formatting failures on 64
environments and other side effects).

-Rob


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