[RFA] Cast char constant to int in sizeof.exp
Commit Message
PR gdb/22010 concerns a regression I introduced with the scalar
printing changes. The bug is that this code in sizeof.exp:
set signof_byte [get_integer_valueof "(int) '\\377'" -1]
can incorrectly compute sizeof_byte. One underlying problem here is
that gdb's C parser doesn't treat a char constant as an int (this is
PR 19973).
However, it seems good to have an immediate fix for the regression.
The simplest is to cast to an int here.
testsuite/ChangeLog
2017-09-05 Tom Tromey <tom@tromey.com>
PR gdb/22010:
* gdb.base/sizeof.exp (check_valueof): Cast char constant to int.
---
gdb/testsuite/ChangeLog | 5 +++++
gdb/testsuite/gdb.base/sizeof.exp | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)
Comments
On 09/06/2017 05:53 AM, Tom Tromey wrote:
> PR gdb/22010 concerns a regression I introduced with the scalar
> printing changes. The bug is that this code in sizeof.exp:
>
> set signof_byte [get_integer_valueof "(int) '\\377'" -1]
The cast shouldn't be here in the log. The cast is what fixes it.
>
> can incorrectly compute sizeof_byte. One underlying problem here is
> that gdb's C parser doesn't treat a char constant as an int (this is
> PR 19973).
>
> However, it seems good to have an immediate fix for the regression.
> The simplest is to cast to an int here.
>
> testsuite/ChangeLog
> 2017-09-05 Tom Tromey <tom@tromey.com>
>
> PR gdb/22010:
> * gdb.base/sizeof.exp (check_valueof): Cast char constant to int.
OK.
Thanks,
Pedro Alves
@@ -1,5 +1,10 @@
2017-09-05 Tom Tromey <tom@tromey.com>
+ PR gdb/22010:
+ * gdb.base/sizeof.exp (check_valueof): Cast char constant to int.
+
+2017-09-05 Tom Tromey <tom@tromey.com>
+
* lib/gdb.exp (gdb_compile): Don't use universal_compile_options
for rust.
@@ -86,7 +86,7 @@ proc check_valueof { exp val } {
# Check that GDB and the target agree over the sign of a character.
-set signof_byte [get_integer_valueof "'\\377'" -1]
+set signof_byte [get_integer_valueof "(int) '\\377'" -1]
set signof_char [get_integer_valueof "(int) (char) -1" -1]
set signof_signed_char [get_integer_valueof "(int) (signed char) -1" -1]
set signof_unsigned_char [get_integer_valueof "(int) (unsigned char) -1" -1]