[Bug c/13050] New: RFE: Support for implementation-specific format specifiers in format string warnings

[jonwil at tpgi dot com dot au]

GCC will warn about invalid format specifiers in format strings with printf and
similar functions. However, the list of format specifiers that GCC warns about
is the specific list given in the ANSI/ISO C standard. However, many runtime
libraries (including the runtime library used on the MingW target, which is the
standard windows C runtime from Microsoft) support extra format specifiers (for
example, the Microsoft runtime supports %wZ for printing out a special kind of
string used by the windows kernel). Basicly, this is a request for a feature
(perhaps in the SPEC file) to enable specific implementations to add/modify the
list of which format specifiers GCC will warn about.
I do know that you can turn the warning off with -Wno-format but that defeats
the purpose of format argument validation.

Directly related to this would be a way to specify that a particular function
(and argument to that function) should be interpereted as a format specifier
string and checked as such.

-- 
           Summary: RFE: Support for implementation-specific format
                    specifiers in format string warnings
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jonwil at tpgi dot com dot au
                CC: gcc-bugs at gcc dot gnu dot org,jonwil at tpgi dot com
                    dot au
 GCC build triplet: all
  GCC host triplet: all
GCC target triplet: all


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13050