[Bug build/24060] New: Build failure on macOS

[simon.marchi at ericsson dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24060

            Bug ID: 24060
           Summary: Build failure on macOS
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com
  Target Milestone: ---

On macOS 10.14 with current master, I get:

  CXX    c-exp.o
In file included from /Users/simark/src/binutils-gdb/gdb/c-exp.y:38:
In file included from /Users/simark/src/binutils-gdb/gdb/defs.h:670:
In file included from /Users/simark/src/binutils-gdb/gdb/utils.h:24:
In file included from /Users/simark/src/binutils-gdb/gdb/exceptions.h:23:
/Users/simark/src/binutils-gdb/gdb/ui-out.h:80:3: error: expected identifier
  VARIABLE,
  ^
c-exp.c:176:18: note: expanded from macro 'VARIABLE'
#define VARIABLE 299
                 ^

c-exp.c is built using the default version of bison that comes with the OS,
which is quite old:

$ bison --version
bison (GNU Bison) 2.3
Written by Robert Corbett and Richard Stallman.

When installing and using a more recent version of bison using brew (3.2.4),
everything works fine.

The failure started at commit 80ae204359b707f2914132ed353d3cecbdb58b23, "Style
variable names".

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