[Bug build/14515] New: BFD update cause undefined reference to `bfd_und_section'

["ray_linn at hotmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14515

             Bug #: 14515
           Summary: BFD update cause undefined reference to
                    `bfd_und_section'
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: critical
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: ray_linn@hotmail.com
    Classification: Unclassified


I am using MinGW64 to compile the GDB 7.5 ( GDB 7.4.1 was completed without
error), and finally I got the error as following:

elfread.o:elfread.c:(.text+0x896): undefined reference to `bfd_und_section'
elfread.o:elfread.c:(.text+0xb1a): undefined reference to `bfd_abs_section'
elfread.o:elfread.c:(.text+0xb4a): undefined reference to `bfd_abs_section'
elfread.o:elfread.c:(.text+0xf42): undefined reference to `bfd_abs_section'

checking the BFD source code, in the bfd.h, the following lines exists in GDB
7.4.1 but was deleted in GDB 7.5.1


/* The absolute section.  */
extern asection bfd_abs_section;
#define bfd_abs_section_ptr ((asection *) &bfd_abs_section)
#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
/* Pointer to the undefined section.  */
extern asection bfd_und_section;

without the declare, of course elfread.c can not be linked

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