Update to 0.6.4.

Changes:

0.6.4 (13 March 2004)

        Runtime engine:

        * Write Reflection.Emit binaries in "wb" mode.
        * Set the execute bit on binaries written by Reflection.Emit.
        * Fixes to unsafe-mode verification rules regarding pointers.
        * Verification fixes for storing managed pointers via "stind.i".
        * Modify internalcalls for "WaitAll" and "WaitAny" to work
          around "MarshalByRefObject" adding a new field.
        * Internalcalls for file lengths and attributes (Russell Stuart).
        * Pass pointer parameters to delegates correctly (Gopal V).

        C# Compiler:

        * Fixes to reference type coercion.
        * "params" array matching only on the last parameter (Gopal V).
        * Filter out instance members when searching nested parent scopes.
        * Assignment of arrays to pointer variables in "fixed" statements.
        * Implement pointer comparison, addition, and subtraction.

        C Compiler:

        * Rewrite the type system to use native layout.
        * Thread-specific variables.
        * Fix casts from function pointer types to "void *".
        * Computed goto support.
        * Register parameters of the form "register type".
        * Fix semantic analysis for expression statements.
        * Add C#-style casts and coercions.
        * Make "long double" an alias for "double" because MS runtime engines
          don't handle the "native float" IL type correctly.
        * Improve the visibility of C definitions to C# applications.
        * Add some C# and Managed C++ syntax to aid with interoperation.
        * Allow C# strings to be defined with S"foo".
        * "using" and "using namespace" to import C# types into C programs.
        * Output the parameter types for PInvoke declarations.
        * Bug in the declaration of functions returning function pointers.
        * Set the default PInvoke calling convention to "cdecl".
        * Handle string initializations of the form {"foo"}.
        * Convert constants of the form 123L into native ints, not int64.

        Linker:

        * Improve detection of unresolved references in C applications.
        * Use C type names in error messages where appropriate.
        * Use "OpenSystem.C.GlobalScopeAttribute" to export C# definitions
          into the global C scope.
        * Use ordinary names like "libc" for C modules instead of "$Module$".
        * Remove C "memory models", which aren't needed any more.

        Loader and Metadata:

        * Allow custom modifiers within a "byref" type.
        * Look for "pinvoke.map" files when resolving PInvoke libraries.

        Csant:

        * Missing options for mcs compiles (Ilyak Kasnacheev).

        Documentation:

        * Rewrite the C user's guide and move it into "pnettools.texi".
        * Update the C ABI specification to reflect changes to the C compiler.

        Platform Support:

        * Enable FreeBSD pthreads support (Adam Ballai).
        * Use the tm_gmtoff field for timezones (Ole Guldberg Jensen).
        * Explicitly invoke the shell when configuring libgc and libffi.
        * Work around bugs with read-write locks on systems with NPTL.
        * Use $(EXEEXT) on install lines that need it, for mingw32.
        * Fixup SOCKETLIBS and suppress libm under mingw32 environments.

        Other:

        * Check in a copy of gcc's cpp so that we can avoid system cpp bugs.
        * Add the "#using#" directive to cpp.
        * Update the "pnet.spec.in" file (Russell Stuart).

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