[Bug build/17077] New: --with-system-readline uses bundled readline include files

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17077

            Bug ID: 17077
           Summary: --with-system-readline uses bundled readline include
                    files
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
            Target: x86_64-linux-gnu

When building tui/tui-io.c one can see in gcc -E still the bundled readline
include files get used.

# 32 "./../opcodes/../readline/rltypedefs.h"
#define _FUNCTION_DEF

As the libreadline.a is linked from system it may lead to incompatible ABI.

I do not have an idea how to fix it.  Fedora GDB packaging ensures the build is
correct by "rm -rf readline" in the source tree.

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