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from 365ffdc172c aarch64: fixup: Implement sme2+faminmax extension. new 0eac9cfee8c c, c++: Extend -Wunused-but-set-* warnings [PR44677]

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Summary of changes: gcc/c-family/c-attribs.cc | 3 +- gcc/c-family/c-opts.cc | 11 ++++ gcc/c/c-decl.cc | 8 +-- gcc/c/c-parser.cc | 48 ++++++++++++-- gcc/c/c-typeck.cc | 31 ++++++++- gcc/cobol/gcobolspec.cc | 8 --- gcc/common.opt | 10 ++- gcc/common.opt.urls | 6 ++ gcc/cp/cp-gimplify.cc | 8 +++ gcc/cp/decl.cc | 8 +-- gcc/cp/expr.cc | 39 ++++++++++- gcc/cp/module.cc | 3 +- gcc/cp/semantics.cc | 5 ++ gcc/cp/typeck.cc | 28 +++++++- gcc/diagnostic-spec.cc | 4 +- gcc/doc/invoke.texi | 75 ++++++++++++++++++++-- gcc/gimple-ssa-store-merging.cc | 4 +- gcc/go/gofrontend/gogo.cc | 3 +- gcc/ipa-strub.cc | 2 + gcc/testsuite/c-c++-common/Wunused-parm-1.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-parm-2.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-parm-3.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-parm-4.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-parm-5.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-parm-6.c | 50 +++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-19.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-20.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-21.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-22.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-23.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-24.c | 60 +++++++++++++++++ gcc/testsuite/c-c++-common/Wunused-var-7.c | 4 +- .../g++.dg/cpp26/name-independent-decl1.C | 2 +- gcc/testsuite/g++.dg/warn/Wunused-parm-12.C | 59 +++++++++++++++++ gcc/testsuite/g++.dg/warn/Wunused-parm-13.C | 59 +++++++++++++++++ gcc/testsuite/g++.dg/warn/Wunused-var-2.C | 4 +- gcc/testsuite/g++.dg/warn/Wunused-var-40.C | 69 ++++++++++++++++++++ gcc/testsuite/g++.dg/warn/Wunused-var-41.C | 69 ++++++++++++++++++++ gcc/testsuite/gcc.dg/memchr-3.c | 3 +- gcc/testsuite/gcc.dg/unused-9.c | 9 +-- 40 files changed, 1185 insertions(+), 57 deletions(-) create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-1.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-2.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-3.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-4.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-5.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-parm-6.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-19.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-20.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-21.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-22.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-23.c create mode 100644 gcc/testsuite/c-c++-common/Wunused-var-24.c create mode 100644 gcc/testsuite/g++.dg/warn/Wunused-parm-12.C create mode 100644 gcc/testsuite/g++.dg/warn/Wunused-parm-13.C create mode 100644 gcc/testsuite/g++.dg/warn/Wunused-var-40.C create mode 100644 gcc/testsuite/g++.dg/warn/Wunused-var-41.C