[cfe-commits] [PATCH] format attribute improvements.
fjahanian at apple.com
Wed Jan 25 13:02:19 PST 2012
On Jan 25, 2012, at 10:41 AM, Jean-Daniel Dupas wrote:
> Le 25 janv. 2012 à 18:33, jahanian a écrit :
>> On Jan 24, 2012, at 4:39 PM, Jean-Daniel Dupas wrote:
>>> 3-macros: In Obj-C and CoreFoundation, the recommended way to localize string are respectively to use NSLocalizedString(key, comment) and CFCopyLocalizedString(key, comment) macros family.
>>> It is common to use these macros as format string, but as they expand to method/function call, clang will warn about "non literal string" used as format string.
>>> So, this patch is a tentative to prevent diagnostic for this common usage. It inhibits the "non literal string format" diagnostic when the format type if NS/CFstring and the format argument is a macro expansion.
>>> Note that while the CFCopyLocalizedString() expands to a function properly tagged with the "format_arg" attribute, we can't rely on it, because interpreting the 'key' parameter as a format string is incorrect IMHO.
>>> It is a common practice to use some kind of descriptive name for the key (i.e. "UNEXPECTED_ERROR_TITLE") instead of the string value ("An unexpected error occurred: %@").
>>> Moreover, NSLocalizedString() does not use the "format_arg" attribute.
>> I don't seem to be getting the warning on the test case, and I don't think you have yet checked in the patch.
> You're right. The tested warning is not enabled by default, and I forgot to add it to the test command line (or to enable it using pragma diagnostic).
> I attach an updated version of the remaining patch with this issue fixed.
This patch is OK for the purpose you mentioned.
>> - Fariborz
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