SWIG: Ensure ptrdiff_t is a known type in gcc >= 4.6.1
This patch fixes a compilation error that occurs with gcc >= 4.6.1, caused by swig not including cstddef and not using the std:: namespace prefix for ptrdiff_t. There is an old patch, http://reviews.m5sim.org/r/913/ that no longer applies cleanly and this might be re-iterating the same issue. We work around the problem by always enforcing the inclusion of cstddef in all swig interface declarations, and also by explicitly using std::ptrdiff_t.
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@ -408,6 +408,19 @@ class MetaSimObject(type):
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for param in params:
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param.cxx_predecls(code)
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cls.export_method_cxx_predecls(code)
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code('''\
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/**
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* This is a workaround for bug in swig. Prior to gcc 4.6.1 the STL
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* headers like vector, string, etc. used to automatically pull in
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* the cstddef header but starting with gcc 4.6.1 they no longer do.
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* This leads to swig generated a file that does not compile so we
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* explicitly include cstddef. Additionally, including version 2.0.4,
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* swig uses ptrdiff_t without the std:: namespace prefix which is
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* required with gcc 4.6.1. We explicitly provide access to it.
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*/
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#include <cstddef>
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using std::ptrdiff_t;
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''')
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code('%}')
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code()
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