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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-08-12 22:26:28 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-08-17 00:38:46 +0200 |
| commit | 8b3cbf54ad42c68f5ea2fa5bc2cef5ce9e608571 (patch) | |
| tree | d415ba8c9847ce463b0f967878d663737f6e9084 /options.c | |
| parent | 8b5d92da3b1919f574decb542d93fde82693fe71 (diff) | |
| download | sparse-dev-8b3cbf54ad42c68f5ea2fa5bc2cef5ce9e608571.tar.gz | |
union-cast: teach sparse about union casts
A cast to union type is a GCC extension similar to a compound
literal just for union, using the syntax of a cast.
However, sparse doesn't know about them and treats them like
other casts to non-scalars.
So, teach sparse about them, convert them to the corresponding
compound literal and add a warning flag to enable/disable the
associated warning: -W[no-]union-cast.
Note: a difference between union casts and compound literals
is that the union casts yield rvalues while compound
literals are lvalues but this distinction is not yet done
in this series.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Diffstat (limited to 'options.c')
| -rw-r--r-- | options.c | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -129,6 +129,7 @@ int Wtransparent_union = 0; int Wtypesign = 0; int Wundef = 0; int Wuninitialized = 1; +int Wunion_cast = 0; int Wuniversal_initializer = 0; int Wunknown_attribute = 0; int Wvla = 1; @@ -866,6 +867,7 @@ static const struct flag warnings[] = { { "typesign", &Wtypesign }, { "undef", &Wundef }, { "uninitialized", &Wuninitialized }, + { "union-cast", &Wunion_cast }, { "universal-initializer", &Wuniversal_initializer }, { "unknown-attribute", &Wunknown_attribute }, { "vla", &Wvla }, |