On Wed, Oct 20, 2021 at 03:49:09PM +0000, Qing Zhao via Gcc-patches wrote:
> Hi,
>
> In GCC, there are many utility routines for reporting error, warning, or
> information, for example:
>
> warning (0, "weak declaration of %q+D not supported", decl);
> warning_at (stmtloc, OPT_Wmaybe_uninitialized, "%qE may be used
> uninitialized", ptr));
> inform (loc, "in a call to %qT declared with " "attribute %<%s%>", fntype,
> access_str);
> error ("%qD is unavailable: %s", node, (const char *) msg);
>
> There are format-strings inside them, “%q+D”, “%qE”, “%qT”, “%qD”, etc, where
> can I find a doc for the details of
> These format-strings? Or which source files I should read to understand the
> details?
You can take a look at cp/error.c:
/* Called from output_format -- during diagnostic message processing --
to handle C++ specific format specifier with the following meanings:
%A function argument-list.
%C tree code.
%D declaration.
%E expression.
%F function declaration.
%H type difference (from).
%I type difference (to).
%L language as used in extern "lang".
%O binary operator.
%P function parameter whose position is indicated by an integer.
%Q assignment operator.
%S substitution (template + args)
%T type.
%V cv-qualifier.
%X exception-specification. */
static bool
cp_printer (pretty_printer *pp, text_info *text, const char *spec,
or c/c-objc-common.c:
/* Called during diagnostic message formatting process to print a
source-level entity onto BUFFER. The meaning of the format specifiers
is as follows:
%D: a general decl,
%E: an identifier or expression,
%F: a function declaration,
%T: a type.
%V: a list of type qualifiers from a tree.
%v: an explicit list of type qualifiers
%#v: an explicit list of type qualifiers of a function type.
Please notice when called, the `%' part was already skipped by the
diagnostic machinery. */
static bool
c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
Marek
