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| author | Bernd Edlinger <bernd.edlinger@hotmail.de> | 2017-09-15 17:21:50 +0000 |
|---|---|---|
| committer | Bernd Edlinger <edlinger@gcc.gnu.org> | 2017-09-15 17:21:50 +0000 |
| commit | 1d9335766d86262f8335d63d99b328bb44543b01 (patch) | |
| tree | 5e9491b32fa26d79e07318fdf780451f77607b38 /gcc/cp | |
| parent | 4a8ca690b0b73f4e0bae542fd69a1ee0d9e73126 (diff) | |
| download | gcc-1d9335766d86262f8335d63d99b328bb44543b01.zip gcc-1d9335766d86262f8335d63d99b328bb44543b01.tar.gz gcc-1d9335766d86262f8335d63d99b328bb44543b01.tar.bz2 | |
common.opt (Wcast-align=strict): New warning option.
2017-09-15 Bernd Edlinger <bernd.edlinger@hotmail.de>
* common.opt (Wcast-align=strict): New warning option.
* doc/invoke.texi: Document -Wcast-align=strict.
c:
2017-09-15 Bernd Edlinger <bernd.edlinger@hotmail.de>
* c-typeck.c (build_c_cast): Implement -Wcast-align=strict.
cp:
2017-09-15 Bernd Edlinger <bernd.edlinger@hotmail.de>
* typeck.c (build_reinterpret_cast_1,
build_const_cast_1): Implement -Wcast-align=strict.
testsuite:
2017-09-15 Bernd Edlinger <bernd.edlinger@hotmail.de>
* c-c++-common/Wcast-align.c: New test.
From-SVN: r252832
Diffstat (limited to 'gcc/cp')
| -rw-r--r-- | gcc/cp/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/cp/typeck.c | 17 |
2 files changed, 18 insertions, 4 deletions
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index 0a3b80f..c013225 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,8 @@ +2017-09-15 Bernd Edlinger <bernd.edlinger@hotmail.de> + + * typeck.c (build_reinterpret_cast_1, + build_const_cast_1): Implement -Wcast-align=strict. + 2017-09-15 Jakub Jelinek <jakub@redhat.com> * decl.c (redeclaration_error_message): Use cxx17 instead of cxx1z, diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c index aa5d128..028d56f 100644 --- a/gcc/cp/typeck.c +++ b/gcc/cp/typeck.c @@ -7265,15 +7265,16 @@ build_reinterpret_cast_1 (tree type, tree expr, bool c_cast_p, complain)) return error_mark_node; /* Warn about possible alignment problems. */ - if (STRICT_ALIGNMENT && warn_cast_align - && (complain & tf_warning) + if ((STRICT_ALIGNMENT || warn_cast_align == 2) + && (complain & tf_warning) && !VOID_TYPE_P (type) && TREE_CODE (TREE_TYPE (intype)) != FUNCTION_TYPE && COMPLETE_TYPE_P (TREE_TYPE (type)) && COMPLETE_TYPE_P (TREE_TYPE (intype)) - && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (intype))) + && min_align_of_type (TREE_TYPE (type)) + > min_align_of_type (TREE_TYPE (intype))) warning (OPT_Wcast_align, "cast from %qH to %qI " - "increases required alignment of target type", intype, type); + "increases required alignment of target type", intype, type); /* We need to strip nops here, because the front end likes to create (int *)&a for array-to-pointer decay, instead of &a[0]. */ @@ -7447,6 +7448,14 @@ build_const_cast_1 (tree dst_type, tree expr, tsubst_flags_t complain, the user is making a potentially unsafe cast. */ check_for_casting_away_constness (src_type, dst_type, CAST_EXPR, complain); + /* ??? comp_ptr_ttypes_const ignores TYPE_ALIGN. */ + if ((STRICT_ALIGNMENT || warn_cast_align == 2) + && (complain & tf_warning) + && min_align_of_type (TREE_TYPE (dst_type)) + > min_align_of_type (TREE_TYPE (src_type))) + warning (OPT_Wcast_align, "cast from %qH to %qI " + "increases required alignment of target type", + src_type, dst_type); } if (reference_type) { |