[PATCH] ClassScopeFunctionSpecializationDecl issue with -fdelayed-template-parsing

Will Wilson will at indefiant.com
Wed Apr 24 03:42:45 PDT 2013

*ping* Anyone available for a quick review of this patch?


On 19 April 2013 21:18, Will Wilson <will at indefiant.com> wrote:

> Hi All,
> This patch attempts to resolve an issue seen when a CXXMethodDecl
> (produced via a ClassScopeFunctionSpecializationDecl) is encountered
> with -fdelayed-template-parsing enabled. This is needed to successfully
> compile the VS2012 xlocnum header (see: class numpunct) which is used by a
> number of other core MS STL headers .
> The existing logic in Parser::ParseLateTemplatedFuncDef() uses a special
> case if the FunctionDecl was a Declarator with template parameter lists, in
> which case most of the parent scope was ignored. Unfortunately this is the
> code path used by CXXMethodDecl's generated from
> ClassScopeFunctionSpecializationDecl's. This would break name lookup for
> parameter's named in the parent context:
>   test/SemaTemplate/ms-function-specialization-class-scope.cpp:55:4: error:
>       unknown type name 'T'
>           T a = 3;
>           ^
> The approach I've taken may be missing a lower-level issue, as it simply
> attempts to ensure the parent lookup scope is always restored. Oddly, there
> seems to be a number of checks for ClassTemplatePartialSpecializationDecl
> in the delayed template parsing code that never get called - is
> this evidence that the design changed at some time?
> Either way, this patch seems to resolve the issue and passes all existing
> tests. I've also added an additional test run to
> ms-function-specialization-class-scope.cpp with -fdelayed-template-parsing
> enabled in order to reproduce the original issue.
> - Will.

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