[Bug libc/17721] New: __restrict defined as /* Ignore */ even in c11

[Bug libc/17721] New: __restrict defined as /* Ignore */ even in c11

[dwight.guth at runtimeverification dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17721

            Bug ID: 17721
           Summary: __restrict defined as /* Ignore */ even in c11
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: dwight.guth at runtimeverification dot com
                CC: drepper.fsp at gmail dot com

A number of functions in stdio.h and other places are declared in the C11
standard as taking parameters with the type qualifier "restrict". This works if
the __GNUC__ macro is defined with the appropriately recent version of GCC.
However, C11 also defines the restrict qualifier. But the __restrict macro used
by these header files does not take this into account. Therefore, for non-GCC
compilers using the GLIBC header files, they incorrectly do not allow the
restrict qualifier on these functions, causing them to be typed wrongly.

cf misc/sys/cdefs.h line 363.

Note this also seems to be true of inline (line 72).

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