can't compile pistachio/user/lib/io/ia32-port.h without -O

[Matthew Dempsky]

(I realize the L4Ka mailing list would be better suited for this,
however, I already tried subscribing and mailing it, and my mail relay
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on this information or forward it appropriately.  Thanks.)

I was trying to compile Pistachio last night, and discovered that the
inb() function in pistachio/user/lib/io/ia32-port.h fails to compile
with an "impossible constraint" error if you don't use any
optimizations.  I opened a bug entry for this in the GCC bugzilla
database [1], but they think this is an error in the code, not gcc.

I've noticed that the Linux kernel's inb() function on ia32 is similar,
except that it uses the "=a" constraint instead of the "=al" constraint,
and by changing the Pistachio source code similarly it succeeds in
compiling even without optimizations.

However, I can't find anywhere in the gcc manuals a description of what
the "l" constraint is supposed to do, so I'm not positive whether it's a
typo in the Pistachio source or a missing entry in the gcc source.

[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20328

-- 
Matthew Dempsky <address@hidden>

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