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from 3a873c0a7bc Rename double_u with __double_u to avoid pulluting the namespace. new 867d1264fe7 C: allow aliasing of compatible types derived from enumeral [...] new d2cfe8a73b3 C23: allow aliasing for types derived from structs with var [...]

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Summary of changes: gcc/c-family/c-attribs.cc | 1 + gcc/c/c-decl.cc | 13 ++++++++--- gcc/c/c-objc-common.cc | 12 ++--------- gcc/c/c-typeck.cc | 37 +++++++++++++++++++++++++++++--- gcc/godump.cc | 10 +++------ gcc/testsuite/gcc.dg/enum-alias-1.c | 24 +++++++++++++++++++++ gcc/testsuite/gcc.dg/enum-alias-2.c | 25 +++++++++++++++++++++ gcc/testsuite/gcc.dg/enum-alias-3.c | 26 ++++++++++++++++++++++ gcc/testsuite/gcc.dg/enum-alias-4.c | 22 +++++++++++++++++++ gcc/testsuite/gcc.dg/gnu23-tag-alias-8.c | 24 +++++++++++++++++++++ 10 files changed, 171 insertions(+), 23 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/enum-alias-1.c create mode 100644 gcc/testsuite/gcc.dg/enum-alias-2.c create mode 100644 gcc/testsuite/gcc.dg/enum-alias-3.c create mode 100644 gcc/testsuite/gcc.dg/enum-alias-4.c create mode 100644 gcc/testsuite/gcc.dg/gnu23-tag-alias-8.c