https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81882
Martin Sebor changed:
What|Removed |Added
Keywords||documentation
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed||2017-08-17
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot
gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor ---
I believe the documentation should be changed like so:
Index: gcc/doc/extend.texi
===
--- gcc/doc/extend.texi (revision 251156)
+++ gcc/doc/extend.texi (working copy)
@@ -2783,21 +2783,24 @@ The @code{ifunc} attribute is used to mark a funct
function using the STT_GNU_IFUNC symbol type extension to the ELF
standard. This allows the resolution of the symbol value to be
determined dynamically at load time, and an optimized version of the
-routine can be selected for the particular processor or other system
+routine to be selected for the particular processor or other system
characteristics determined then. To use this attribute, first define
the implementation functions available, and a resolver function that
returns a pointer to the selected implementation function. The
implementation functions' declarations must match the API of the
-function being implemented, the resolver's declaration is be a
-function returning pointer to void function returning void:
+function being implemented. The resolver should be declared to
+be a function returning a pointer to a function taking no arguments
+and returning a pointer to a function of the same type as the
+implementation. For example:
@smallexample
void *my_memcpy (void *dst, const void *src, size_t len)
@{
@dots{}
+ return dst;
@}
-static void (*resolve_memcpy (void)) (void)
+static void* (*resolve_memcpy (void))(void *, const void *, size_t)
@{
return my_memcpy; // we'll just always select this routine
@}
