This fixes an ICE taking place in cp_default_conversion because we got a SCOPE_REF that doesn't have a type and so checking INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (exp)) will crash. This happens since the recent Joseph's change in decl_attributes whereby we don't skip C++11 attributes on types.
[dcl.align] is clear that alignas applied to a function is ill-formed. That should be fixed, and we have PR90847 for that. But I think a more appropriate fix at this stage would be the following: in a template we want to splice dependent attributes and save them for later, and by doing so avoid this crash. Bootstrapped/regtested on x86_64-linux, ok for trunk? PR c++/93530 - ICE on invalid alignas in a template. * decl.c (grokdeclarator): Call cplus_decl_attributes instead of decl_attributes. * g++.dg/cpp0x/alignas18.C: New test. --- gcc/cp/decl.c | 2 +- gcc/testsuite/g++.dg/cpp0x/alignas18.C | 8 ++++++++ 2 files changed, 9 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/cpp0x/alignas18.C diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c index 6ad558eef9e..576cbd8643a 100644 --- a/gcc/cp/decl.c +++ b/gcc/cp/decl.c @@ -12300,7 +12300,7 @@ grokdeclarator (const cp_declarator *declarator, The optional attribute-specifier-seq appertains to the function type. */ - decl_attributes (&type, attrs, 0); + cplus_decl_attributes (&type, attrs, 0); if (raises) type = build_exception_variant (type, raises); diff --git a/gcc/testsuite/g++.dg/cpp0x/alignas18.C b/gcc/testsuite/g++.dg/cpp0x/alignas18.C new file mode 100644 index 00000000000..820bdd2d7ca --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/alignas18.C @@ -0,0 +1,8 @@ +// PR c++/93530 - ICE on invalid alignas in a template. +// { dg-do compile { target c++11 } } + +template <typename T> struct S { + using U = S; + // FIXME: This is ill-formed; see PR90847. + void fn() alignas(U::X); +}; base-commit: 2a07345c4f8dabc286fc470e76c53473e5bc3eb7 -- Marek Polacek • Red Hat, Inc. • 300 A St, Boston, MA