[Bug build/17496] New: <builddir>/gnu/lib-names.h not generated

["triegel at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17496

            Bug ID: 17496
           Summary: <builddir>/gnu/lib-names.h not generated
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: triegel at redhat dot com
                CC: carlos at redhat dot com

After 93ae1ebaa6df1a0c188614bd0a601ab6e26711c5 (also see bug 14171),
gnu/lib-names.h isn't generated anymore, which breaks my build (including
from-scratch builds) because /usr/include/gnu/lib-names.h on my system doesn't
have a LIBGCC_S_SO entry:
../sysdeps/gnu/unwind-resume.c: In function âinitâ:
../sysdeps/gnu/unwind-resume.c:36: error: âLIBGCC_S_SOâ undeclared (first use
in this function).

Manually doing the following (on x86_64)
 make gnu/lib-names.h
 make gnu/lib-names-64.h
fixes the issue.

This is on a RHEL-6.5-based distro with GCC 4.4.7.

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