Add the ability to turn off checks for casts that truncate constant values
using -Wno-cast-truncate, helpful when attempting to track down a particular
class of warnings only without losing them amongst others. Checks for
truncating casts default to on, so this does not change the default behavior
of sparse.
Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxx>
---
expand.c | 4 ++++
lib.c | 2 ++
lib.h | 1 +
3 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/expand.c b/expand.c
index 474344d..882d80e 100644
--- a/expand.c
+++ b/expand.c
@@ -94,6 +94,10 @@ Int:
mask = signmask | (signmask-1);
expr->value = value & mask;
+ // Stop here unless checking for truncation
+ if (!Wcast_truncate)
+ return;
+
// Check if we dropped any bits..
oldsignmask = 1ULL << (old_size-1);
oldmask = oldsignmask | (oldsignmask-1);
diff --git a/lib.c b/lib.c
index d92418a..7a2e291 100644
--- a/lib.c
+++ b/lib.c
@@ -169,6 +169,7 @@ static char pre_buffer[8192];
int Wdefault_bitfield_sign = 0;
int Wone_bit_signed_bitfield = 1;
+int Wcast_truncate = 1;
int Wbitwise = 0;
int Wtypesign = 0;
int Wcontext = 0;
@@ -316,6 +317,7 @@ static const struct warning {
{ "cast-to-as", &Wcast_to_address_space },
{ "decl", &Wdecl },
{ "one-bit-signed-bitfield", &Wone_bit_signed_bitfield },
+ { "cast-truncate", &Wcast_truncate },
{ "ptr-subtraction-blows", &Wptr_subtraction_blows },
{ "default-bitfield-sign", &Wdefault_bitfield_sign },
{ "undef", &Wundefined_preprocessor },
diff --git a/lib.h b/lib.h
index 5f67a12..b542cd6 100644
--- a/lib.h
+++ b/lib.h
@@ -82,6 +82,7 @@ extern int Wcast_to_address_space;
extern int Wenum_mismatch;
extern int Wdecl;
extern int Wone_bit_signed_bitfield;
+extern int Wcast_truncate;
extern void declare_builtin_functions(void);
extern void create_builtin_stream(void);
-
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