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Hi! Checking the new constexpr support in the C++0x frontend, I've notices that there is one place where a plain constant is accepted but a constexpr is not. Probably you have guessed (from the subject line above), it is in an attribute argument, e.g: constexpr int foo() { return 4; } int __attribute__((aligned(4))) a; //ok int __attribute__((aligned(foo()))) b; //error: requested alignment is not a constant IMHO, this code is correct. The attached patch solves this issue cleanly, I think. In the included testsuite I've used only the attribute ((aligned)), but I don't think that should matter too much. Regards -- Rodrigo Changelog: gcc/cp/ 2011-03-10 Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> * decl2.c (cp_check_const_attributes): New. (cplus_decl_attributes): Call cp_check_const_attributes. gcc/testsuite/ 2011-03-10 Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> * g++.dg/cpp0x/constexpr-attribute.C: New.
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