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from 2861eb34e30 c++: normalizing ttp constraints [PR115656] new 2bd8177256b C++: Support clang compatible [[musttail]] (PR83324) new 78bbdbd5352 C: Implement musttail attribute for returns new 8d1af8f904a Add tests for C/C++ musttail attributes new 8daae81113e Add documentation for musttail attribute

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Summary of changes: gcc/c-family/c-attribs.cc | 20 ++++++++++ gcc/c-family/c-common.h | 1 + gcc/c/c-parser.cc | 71 +++++++++++++++++++++++++++------ gcc/c/c-tree.h | 2 +- gcc/c/c-typeck.cc | 7 +++- gcc/cp/cp-tree.h | 4 ++ gcc/cp/parser.cc | 32 +++++++++++++-- gcc/cp/pt.cc | 9 ++++- gcc/cp/semantics.cc | 1 + gcc/doc/extend.texi | 25 +++++++++++- gcc/testsuite/c-c++-common/musttail1.c | 14 +++++++ gcc/testsuite/c-c++-common/musttail12.c | 15 +++++++ gcc/testsuite/c-c++-common/musttail13.c | 5 +++ gcc/testsuite/c-c++-common/musttail2.c | 33 +++++++++++++++ gcc/testsuite/c-c++-common/musttail3.c | 29 ++++++++++++++ gcc/testsuite/c-c++-common/musttail4.c | 17 ++++++++ gcc/testsuite/c-c++-common/musttail5.c | 28 +++++++++++++ gcc/testsuite/c-c++-common/musttail7.c | 14 +++++++ gcc/testsuite/c-c++-common/musttail8.c | 17 ++++++++ gcc/testsuite/g++.dg/musttail10.C | 40 +++++++++++++++++++ gcc/testsuite/g++.dg/musttail11.C | 33 +++++++++++++++ gcc/testsuite/g++.dg/musttail6.C | 60 ++++++++++++++++++++++++++++ gcc/testsuite/g++.dg/musttail9.C | 10 +++++ gcc/testsuite/lib/target-supports.exp | 12 ++++++ 24 files changed, 477 insertions(+), 22 deletions(-) create mode 100644 gcc/testsuite/c-c++-common/musttail1.c create mode 100644 gcc/testsuite/c-c++-common/musttail12.c create mode 100644 gcc/testsuite/c-c++-common/musttail13.c create mode 100644 gcc/testsuite/c-c++-common/musttail2.c create mode 100644 gcc/testsuite/c-c++-common/musttail3.c create mode 100644 gcc/testsuite/c-c++-common/musttail4.c create mode 100644 gcc/testsuite/c-c++-common/musttail5.c create mode 100644 gcc/testsuite/c-c++-common/musttail7.c create mode 100644 gcc/testsuite/c-c++-common/musttail8.c create mode 100644 gcc/testsuite/g++.dg/musttail10.C create mode 100644 gcc/testsuite/g++.dg/musttail11.C create mode 100644 gcc/testsuite/g++.dg/musttail6.C create mode 100644 gcc/testsuite/g++.dg/musttail9.C