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| author | Jakub Jelinek <jakub@redhat.com> | 2016-11-28 16:21:53 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2016-11-28 16:21:53 +0100 |
| commit | f4bb5c171e3bcb244f90dfee5aae6e2bc9f92029 (patch) | |
| tree | 3be1092ec241f5429abaa264e02f87bf0fdc8cc3 /gcc | |
| parent | 21b0f96a821be876db185e58cadd1bd7f7d990b3 (diff) | |
| download | gcc-f4bb5c171e3bcb244f90dfee5aae6e2bc9f92029.zip gcc-f4bb5c171e3bcb244f90dfee5aae6e2bc9f92029.tar.gz gcc-f4bb5c171e3bcb244f90dfee5aae6e2bc9f92029.tar.bz2 | |
re PR c++/77591 (decltype(auto) and ternary operator allow returning local reference without a warning)
PR c++/77591
* typeck.c (maybe_warn_about_returning_address_of_local): Optimize
whats_returned through fold_for_warn.
* g++.dg/cpp1y/pr77591.C: New test.
From-SVN: r242924
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cp/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/cp/typeck.c | 2 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp1y/pr77591.C | 19 |
4 files changed, 31 insertions, 1 deletions
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index c6bc06f..f442a7a 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,9 @@ +2016-11-28 Jakub Jelinek <jakub@redhat.com> + + PR c++/77591 + * typeck.c (maybe_warn_about_returning_address_of_local): Optimize + whats_returned through fold_for_warn. + 2016-11-27 Jason Merrill <jason@redhat.com> PR c++/77907 diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c index 6f9ad0e..68fe19e 100644 --- a/gcc/cp/typeck.c +++ b/gcc/cp/typeck.c @@ -8612,7 +8612,7 @@ static bool maybe_warn_about_returning_address_of_local (tree retval) { tree valtype = TREE_TYPE (DECL_RESULT (current_function_decl)); - tree whats_returned = retval; + tree whats_returned = fold_for_warn (retval); for (;;) { diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index b69d554..1444448 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-11-28 Jakub Jelinek <jakub@redhat.com> + + PR c++/77591 + * g++.dg/cpp1y/pr77591.C: New test. + 2016-11-28 David Edelsohn <dje.gcc@gmail.com> * gcc.dg/torture/pr78515.c: Ignore ABI extension warning. diff --git a/gcc/testsuite/g++.dg/cpp1y/pr77591.C b/gcc/testsuite/g++.dg/cpp1y/pr77591.C new file mode 100644 index 0000000..8f9e28c --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/pr77591.C @@ -0,0 +1,19 @@ +// PR c++/77591 +// { dg-do compile { target c++14 } } +// { dg-options "-O0 -Wreturn-local-addr" } + +class A { }; + +decltype(auto) +foo () +{ + A c; // { dg-warning "reference to local variable 'c' returned" } + return (c); +} + +decltype(auto) +bar () +{ + A c; // { dg-warning "reference to local variable 'c' returned" } + return 1==1 ? c : c; +} |